{ "dataset": "European time sources — NTS / IPv6 / stratum", "measured_at": "2026-07-12", "license": "CC BY 4.0", "measured_from": [ { "as": "AS206014", "operator": "RDEM Systems", "role": "our own AS — the only one we operate" }, { "as": "AS12322", "operator": "Free", "role": "our office ISP — we are a customer, we do not run it" }, { "as": "AS1299", "operator": "Arelion", "role": "international transit provider" }, { "as": "AS29075", "operator": "IELO", "role": "French transit provider" }, { "as": "AS199275", "operator": "IPSET", "role": "French transit provider" }, { "as": "AS51167", "operator": "Contabo", "role": "German host" } ], "method": { "nts": "THREE states. yes = ALPN ntske/1 negotiated AND certificate valid FOR THE NAME QUERIED. cert-invalid = ALPN passes but certificate issued for another name: a conforming client refuses (RFC 8915 mandates validation). no = closed/silent/no NTS-KE. An open port proves nothing; a negotiated ALPN proves nothing either.", "stratum": "Measured via SNTP v4.", "ipv6": "AAAA published AND effective NTP reply.", "reachable_from": "X/6 — a server reachable from only some of the six ASes is marked PARTIAL, not reachable. 3 servers are partial, including our own Stratum 1 (4/6)." }, "counting_rule": "Deduplicated BY RESOLVED IP (several hostnames = same machine). Pool zones excluded. Filter counted=true to reproduce the figures.", "counts": { "probed_hostnames": 267, "counted_machines": 231, "nts": 79, "nts_raw_do_not_publish": 91 }, "limits": [ "Snapshot 2026-07-12.", "Central and Eastern Europe only partially probed — a KNOWN GAP, not a measured fact.", "GARR (IT) and DFN (DE) publish no public NTP server: verified.", "Contributions welcome: https://www.rdem-systems.com/contact/" ], "results": [ { "host": "time.cloudflare.com", "ip": "162.159.200.1", "status": "OK", "stratum": 3, "refid": "10.20.8.5", "root_dispersion_ms": 0.29, "rtt_ms": 2.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "International", "operator": "Cloudflare", "type": "anycast", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "time.google.com", "ip": "216.239.35.0", "status": "OK", "stratum": 1, "refid": "GOOG", "root_dispersion_ms": 0.08, "rtt_ms": 11.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Google", "type": "anycast", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time1.google.com", "ip": "216.239.35.0", "status": "OK", "stratum": 1, "refid": "GOOG", "root_dispersion_ms": 0.08, "rtt_ms": 13.6, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Google", "type": "alias", "nts_claimed": "no", "counted": false, "reachable_from": "6/6" }, { "host": "time2.google.com", "ip": "216.239.35.4", "status": "OK", "stratum": 1, "refid": "GOOG", "root_dispersion_ms": 0.08, "rtt_ms": 16.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Google", "type": "service endpoint", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time3.google.com", "ip": "216.239.35.8", "status": "OK", "stratum": 1, "refid": "GOOG", "root_dispersion_ms": 0.08, "rtt_ms": 14.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Google", "type": "service endpoint", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time4.google.com", "ip": "216.239.35.12", "status": "OK", "stratum": 1, "refid": "GOOG", "root_dispersion_ms": 0.09, "rtt_ms": 13.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Google", "type": "service endpoint", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time.euro.apple.com", "ip": "17.253.108.125", "status": "OK", "stratum": 1, "refid": "GPSs", "root_dispersion_ms": 0.14, "rtt_ms": 1.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Apple", "type": "regional service alias", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time.facebook.com", "ip": "129.134.28.123", "status": "OK", "stratum": 1, "refid": "LHR1", "root_dispersion_ms": 0.02, "rtt_ms": 15.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "International", "operator": "Meta", "type": "anycast", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.ubuntu.com", "ip": "185.125.190.56", "status": "OK", "stratum": 2, "refid": "99.220.8.133", "root_dispersion_ms": 1.11, "rtt_ms": 22.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "United Kingdom", "operator": "Canonical", "type": "managed service alias", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "paris.time.system76.com", "ip": "15.237.97.214", "status": "OK", "stratum": 2, "refid": "176.179.21.42", "root_dispersion_ms": 1.27, "rtt_ms": 2.4, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "France", "operator": "System76", "type": "server", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "ptbtime1.ptb.de", "ip": "192.53.103.108", "status": "OK", "stratum": 1, "refid": "PTB", "root_dispersion_ms": 0.02, "rtt_ms": 22.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "PTB", "type": "server", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "ptbtime2.ptb.de", "ip": "192.53.103.104", "status": "OK", "stratum": 1, "refid": "PTB", "root_dispersion_ms": 0.02, "rtt_ms": 20.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "PTB", "type": "server", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "ptbtime3.ptb.de", "ip": "192.53.103.103", "status": "OK", "stratum": 1, "refid": "PTB", "root_dispersion_ms": 0.02, "rtt_ms": 18.7, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "PTB", "type": "server", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "ptbtime4.ptb.de", "ip": "194.94.95.123", "status": "OK", "stratum": 1, "refid": "PTB", "root_dispersion_ms": 0.02, "rtt_ms": 29.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "PTB", "type": "server", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.se", "ip": "194.58.200.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 34.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "anycast", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "nts.ntp.se", "ip": "194.58.207.72", "status": "NO_REPLY", "stratum": null, "refid": null, "root_dispersion_ms": null, "rtt_ms": null, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": false, "nts": true, "nts_detail": "yes", "country": "Sweden", "operator": "Netnod", "type": "anycast", "nts_claimed": "yes", "counted": true, "reachable_from": "0/6" }, { "host": "gbg1.ntp.se", "ip": "194.58.203.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 38.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "gbg2.ntp.se", "ip": "194.58.203.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 35.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "mmo1.ntp.se", "ip": "194.58.204.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 42.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "mmo2.ntp.se", "ip": "194.58.204.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 50.4, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "sth1.ntp.se", "ip": "194.58.202.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 30.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "sth2.ntp.se", "ip": "194.58.202.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 29.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "sth3.ntp.se", "ip": "194.58.207.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 30.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "sth4.ntp.se", "ip": "194.58.207.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 33.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "svl1.ntp.se", "ip": "194.58.205.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 38.7, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "svl2.ntp.se", "ip": "194.58.205.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 38.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "lul1.ntp.se", "ip": "194.58.206.20", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 42.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "lul2.ntp.se", "ip": "194.58.206.148", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 43.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "Netnod", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.time.nl", "ip": "94.198.159.10", "status": "OK", "stratum": 1, "refid": "TMNL", "root_dispersion_ms": 0.12, "rtt_ms": 14.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Netherlands", "operator": "SIDN Labs", "type": "managed service alias", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "nts.time.nl", "ip": "94.198.159.11", "status": "OK", "stratum": 1, "refid": "TMNL", "root_dispersion_ms": 0.03, "rtt_ms": 14.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Netherlands", "operator": "SIDN Labs", "type": "managed service alias", "nts_claimed": "yes", "counted": true, "reachable_from": "6/6" }, { "host": "any.time.nl", "ip": "194.0.5.123", "status": "OK", "stratum": 2, "refid": "145.238.80.80", "root_dispersion_ms": 0.24, "rtt_ms": 1.4, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Netherlands", "operator": "SIDN Labs", "type": "anycast", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp1.inrim.it", "ip": "193.204.114.232", "status": "OK", "stratum": 1, "refid": "CTD", "root_dispersion_ms": 0.12, "rtt_ms": 32.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "Italy", "operator": "INRiM", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.inrim.it", "ip": "193.204.114.233", "status": "OK", "stratum": 1, "refid": "CTD", "root_dispersion_ms": 0.14, "rtt_ms": 32.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "Italy", "operator": "INRiM", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "time.inrim.it", "ip": "193.204.114.105", "status": "OK", "stratum": 2, "refid": "34.152.228.32", "root_dispersion_ms": 26.93, "rtt_ms": 32.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "Italy", "operator": "INRiM", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.roa.es", "ip": "150.214.94.10", "status": "OK", "stratum": 1, "refid": "ROA", "root_dispersion_ms": 1.05, "rtt_ms": 38.2, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Spain", "operator": "Real Instituto y Observatorio de la Armada", "type": "managed service alias", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "hora.roa.es", "ip": "150.214.94.5", "status": "OK", "stratum": 1, "refid": "ROA", "root_dispersion_ms": 1.05, "rtt_ms": 38.7, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Spain", "operator": "Real Instituto y Observatorio de la Armada", "type": "alias", "nts_claimed": "no", "counted": false, "reachable_from": "6/6" }, { "host": "minuto.roa.es", "ip": "150.214.94.10", "status": "OK", "stratum": 1, "refid": "ROA", "root_dispersion_ms": 1.05, "rtt_ms": 37.8, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Spain", "operator": "Real Instituto y Observatorio de la Armada", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "tempus1.gum.gov.pl", "ip": "194.146.251.100", "status": "OK", "stratum": 1, "refid": "EXT", "root_dispersion_ms": 1.1, "rtt_ms": 64.4, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Poland", "operator": "Central Office of Measures (GUM)", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "tempus2.gum.gov.pl", "ip": "194.146.251.101", "status": "OK", "stratum": 1, "refid": "EXT", "root_dispersion_ms": 1.07, "rtt_ms": 32.7, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Poland", "operator": "Central Office of Measures (GUM)", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp11.metas.ch", "ip": "195.176.26.204", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.14, "rtt_ms": 26.0, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Switzerland", "operator": "METAS", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp12.metas.ch", "ip": "195.176.26.205", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.12, "rtt_ms": 27.1, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Switzerland", "operator": "METAS", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp13.metas.ch", "ip": "195.176.26.206", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.14, "rtt_ms": 23.5, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Switzerland", "operator": "METAS", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.metas.ch", "ip": "195.176.26.215", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.12, "rtt_ms": 30.7, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Switzerland", "operator": "METAS", "type": "managed service alias", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ts1.aco.net", "ip": "193.171.23.163", "status": "OK", "stratum": 1, "refid": "MRS", "root_dispersion_ms": 0.23, "rtt_ms": 20.7, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Austria", "operator": "ACOnet", "type": "server", "nts_claimed": "no", "counted": true, "reachable_from": "6/6" }, { "host": "ts2.aco.net", "ip": "131.130.251.107", "status": "OK", "stratum": 2, "refid": "131.188.3.223", "root_dispersion_ms": 29.31, "rtt_ms": 21.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": 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"reachable_from": "6/6" }, { "host": "hu.pool.ntp.org", "ip": "193.227.197.2", "status": "OK", "stratum": 3, "refid": "164.204.168.225", "root_dispersion_ms": 0.67, "rtt_ms": 69.6, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Hungary", "operator": "NTP Pool Project — zone HU", "type": "pool", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "ie.pool.ntp.org", "ip": "162.159.200.123", "status": "OK", "stratum": 3, "refid": "10.25.8.4", "root_dispersion_ms": 0.23, "rtt_ms": 2.1, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "cert-invalid", "country": "Ireland", "operator": "NTP Pool Project — zone IE", "type": "pool", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "cz.pool.ntp.org", "ip": "176.118.170.235", "status": "OK", "stratum": 3, "refid": "80.79.27.111", "root_dispersion_ms": 1.28, "rtt_ms": 22.8, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "refused", "country": "Czech Republic", "operator": "NTP Pool Project — zone CZ", "type": "pool", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "hr.pool.ntp.org", "ip": "161.53.131.133", "status": "OK", "stratum": 2, "refid": "195.113.144.204", "root_dispersion_ms": 33.86, "rtt_ms": 30.1, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Croatia", "operator": "NTP Pool Project — zone HR", "type": "pool", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "ntp.rxtx.dk", "ip": "80.248.138.19", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 0.03, "rtt_ms": 33.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Denmark", "operator": "RXTX", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "clock1.infonet.ee", "ip": "212.7.1.131", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.02, "rtt_ms": 37.6, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "Estonia", "operator": "Infonet", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "clock2.infonet.ee", "ip": "212.7.1.132", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.03, "rtt_ms": 38.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "refused", "country": "Estonia", "operator": "Infonet", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.cert.lv", "ip": "80.233.131.171", "status": "OK", "stratum": 1, "refid": "ANT1", "root_dispersion_ms": 0.99, "rtt_ms": 86.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Latvia", "operator": "CERT.LV", "type": "national cybersecurity", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ht-time01.isnic.is", "ip": "193.4.58.77", "status": "OK", "stratum": 1, "refid": "GNSs", "root_dispersion_ms": 0.02, "rtt_ms": 46.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Iceland", "operator": "ISNIC", "type": "alias", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "mh-time01.isnic.is", "ip": "185.93.157.24", "status": "OK", "stratum": 2, "refid": "193.4.58.77", "root_dispersion_ms": 0.32, "rtt_ms": 46.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Iceland", "operator": "ISNIC", "type": "alias", "nts_claimed": "unknown", "counted": false, "reachable_from": "6/6" }, { "host": "ntp1.arnes.si", "ip": "193.2.1.117", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.2, "rtt_ms": 30.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Slovenia", "operator": "ARNES", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.arnes.si", "ip": "193.2.1.92", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.15, "rtt_ms": 29.7, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Slovenia", "operator": "ARNES", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "1.pool.chrony.eu", "ip": "84.255.251.188", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.05, "rtt_ms": 30.4, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Slovenia", "operator": "chrony.eu", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "2.pool.chrony.eu", "ip": "84.255.251.189", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.06, "rtt_ms": 30.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Slovenia", "operator": "chrony.eu", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "3.pool.chrony.eu", "ip": "84.255.251.204", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.05, "rtt_ms": 33.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Slovenia", "operator": "chrony.eu", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "4.pool.chrony.eu", "ip": "84.255.251.205", "status": "OK", "stratum": 1, "refid": "PPS0", "root_dispersion_ms": 0.06, "rtt_ms": 30.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Slovenia", "operator": "chrony.eu", "type": "community", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "vreme2.dmdm.rs", "ip": "195.250.114.105", "status": "OK", "stratum": 2, "refid": "192.168.116.2", "root_dispersion_ms": 3.91, "rtt_ms": 37.2, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Serbia", "operator": "DMDM", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "swice-nts1.switch.ch", "ip": "130.59.80.23", "status": "OK", "stratum": 1, "refid": "ATOM", "root_dispersion_ms": 0.15, "rtt_ms": 18.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Switzerland", "operator": "SWITCH (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time.dfm.dk", "ip": "130.226.165.77", "status": "OK", "stratum": 1, "refid": "DFM", "root_dispersion_ms": 0.02, "rtt_ms": 25.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Denmark", "operator": "DFM (institut de métrologie danois)", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.units.it", "ip": "140.105.48.3", "status": "OK", "stratum": 2, "refid": "152.78.229.49", "root_dispersion_ms": 24.6, "rtt_ms": 32.5, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Italy", "operator": "Université de Trieste", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp0.fau.de", "ip": "131.188.3.220", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 1.07, "rtt_ms": 20.7, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "FAU Erlangen-Nuremberg", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "rustime01.rus.uni-stuttgart.de", "ip": "129.69.253.1", "status": "OK", "stratum": 1, "refid": "MBG", "root_dispersion_ms": 0.02, "rtt_ms": 18.7, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "Université de Stuttgart", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "rustime02.rus.uni-stuttgart.de", "ip": "129.69.253.17", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.21, "rtt_ms": 20.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "Université de Stuttgart", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp1.lrz.de", "ip": "129.187.254.32", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.12, "rtt_ms": 19.0, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "LRZ Munich", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp3.lrz.de", "ip": "141.84.9.197", "status": "OK", "stratum": 1, "refid": "DCFa", "root_dispersion_ms": 4.44, "rtt_ms": 19.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "LRZ Munich", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.rwth-aachen.de", "ip": "134.130.4.17", "status": "OK", "stratum": 1, "refid": "MRS", "root_dispersion_ms": 0.2, "rtt_ms": 13.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "RWTH Aachen", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.rwth-aachen.de", "ip": "134.130.5.17", "status": "OK", "stratum": 1, "refid": "MRS", "root_dispersion_ms": 0.15, "rtt_ms": 14.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "RWTH Aachen", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp1.gwdg.de", "ip": "134.76.249.102", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.2, "rtt_ms": 24.2, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "GWDG Göttingen", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.gwdg.de", "ip": "134.76.249.201", "status": "OK", "stratum": 1, "refid": "PZF", "root_dispersion_ms": 0.17, "rtt_ms": 14.7, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Germany", "operator": "GWDG Göttingen", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.uni-ulm.de", "ip": "134.60.1.27", "status": "OK", "stratum": 2, "refid": "129.69.253.1", "root_dispersion_ms": 0.24, "rtt_ms": 20.2, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": true, "nts_detail": "yes", "country": "Germany", "operator": "Université d'Ulm", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time1.mikes.fi", "ip": "194.100.49.151", "status": "OK", "stratum": 2, "refid": "194.100.49.133", "root_dispersion_ms": 0.21, "rtt_ms": 38.8, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Finland", "operator": "VTT MIKES", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time2.mikes.fi", "ip": "194.100.49.152", "status": "OK", "stratum": 2, "refid": "194.100.49.131", "root_dispersion_ms": 1.85, "rtt_ms": 38.9, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Finland", "operator": "VTT MIKES", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp.heanet.ie", "ip": "193.1.8.106", "status": "OK", "stratum": 1, "refid": "GNSS", "root_dispersion_ms": 0.0, "rtt_ms": 17.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Ireland", "operator": "HEAnet (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "chronos.restena.lu", "ip": "158.64.1.15", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.18, "rtt_ms": 15.6, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Luxembourg", "operator": "RESTENA (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time.restena.lu", "ip": "158.64.1.16", "status": "OK", "stratum": 2, "refid": "136.61.110.210", "root_dispersion_ms": 4.47, "rtt_ms": 10.5, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Luxembourg", "operator": "RESTENA (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.uninett.no", "ip": "158.38.0.184", "status": "OK", "stratum": 2, "refid": "158.38.100.7", "root_dispersion_ms": 2.17, "rtt_ms": 37.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Norway", "operator": "Sikt / Uninett (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp-public.uit.no", "ip": "129.242.4.241", "status": "OK", "stratum": 1, "refid": "GNSS", "root_dispersion_ms": 0.0, "rtt_ms": 57.0, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Norway", "operator": "Université de Tromsø", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp04.oal.ul.pt", "ip": "194.117.47.44", "status": "OK", "stratum": 2, "refid": "150.214.94.5", "root_dispersion_ms": 13.82, "rtt_ms": 27.4, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Portugal", "operator": "Observatoire de Lisbonne", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "5/6" }, { "host": "swice-nts2.switch.ch", "ip": null, "status": "DNS_KO", "stratum": null, "refid": null, "root_dispersion_ms": null, "rtt_ms": null, "ipv4": false, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "dns", "country": "Switzerland", "operator": "SWITCH (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "0/6" }, { "host": "chime1.surfnet.nl", "ip": "192.87.106.2", "status": "OK", "stratum": 1, "refid": "GPS", "root_dispersion_ms": 0.17, "rtt_ms": 15.8, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Netherlands", "operator": "SURF (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "chime2.surfnet.nl", "ip": "192.87.36.4", "status": "OK", "stratum": 1, "refid": "MRS", "root_dispersion_ms": 0.14, "rtt_ms": 18.3, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Netherlands", "operator": "SURF (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "chime3.surfnet.nl", "ip": "192.87.110.2", "status": "OK", "stratum": 2, "refid": "145.145.75.87", "root_dispersion_ms": 3.83, "rtt_ms": 17.9, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Netherlands", "operator": "SURF (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp1.sp.se", "ip": "193.11.166.8", "status": "OK", "stratum": 1, "refid": "PPS", "root_dispersion_ms": 1.04, "rtt_ms": 30.2, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "refused", "country": "Sweden", "operator": "RISE (institut de métrologie)", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "ntp2.sp.se", "ip": "193.11.166.20", "status": "OK", "stratum": 1, "refid": "MBGh", "root_dispersion_ms": 0.02, "rtt_ms": 30.1, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Sweden", "operator": "RISE (institut de métrologie)", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time0.ntp.is", "ip": "193.4.58.77", "status": "OK", "stratum": 1, "refid": "GNSs", "root_dispersion_ms": 0.02, "rtt_ms": 46.1, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Iceland", "operator": "ISNIC", "type": "operator", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "time1.ntp.is", "ip": "185.93.157.24", "status": "OK", "stratum": 2, "refid": "193.4.58.77", "root_dispersion_ms": 0.35, "rtt_ms": 45.8, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": true, "nts": false, "nts_detail": "silent", "country": "Iceland", "operator": "ISNIC", "type": "operator", "nts_claimed": "unknown", "counted": true, "reachable_from": "6/6" }, { "host": "hercules.eim.gr", "ip": "83.212.233.6", "status": "NO_REPLY", "stratum": null, "refid": null, "root_dispersion_ms": null, "rtt_ms": null, "ipv4": true, "ipv6_aaaa": false, "ipv6_answers": false, "nts": false, "nts_detail": "silent", "country": "Greece", "operator": "EIM (institut de métrologie grec)", "type": "national metrology", "nts_claimed": "unknown", "counted": true, "reachable_from": "0/6" }, { "host": "ntp01.fccn.pt", "ip": "193.137.4.250", "status": "NO_REPLY", "stratum": null, "refid": null, "root_dispersion_ms": null, "rtt_ms": null, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": false, "nts": false, "nts_detail": "error", "country": "Portugal", "operator": "FCCN (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "0/6" }, { "host": "ntp02.fccn.pt", "ip": "193.137.4.242", "status": "NO_REPLY", "stratum": null, "refid": null, "root_dispersion_ms": null, "rtt_ms": null, "ipv4": true, "ipv6_aaaa": true, "ipv6_answers": false, "nts": false, "nts_detail": "error", "country": "Portugal", "operator": "FCCN (NREN)", "type": "academic", "nts_claimed": "unknown", "counted": true, "reachable_from": "0/6" } ], "vantage_independence": "Five of the six observation networks are NOT ours. Only AS206014 is operated by RDEM. A measurement taken solely from one's own network would prove little; the convergence of six independent networks is what makes the figure defensible." }