{
 "dataset": "European time sources — NTS / IPv6 / stratum",
 "measured_at": "2026-07-31",
 "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. Aliases are kept with alias_of pointing at the counted machine.",
 "counts": {
  "probed_hostnames": 385,
  "counted_machines": 322,
  "nts": 83,
  "nts_raw_do_not_publish": 98,
  "aliases_resolved": 55,
  "european_countries": 33,
  "european_countries_with_nts": 14,
  "european_countries_without_nts": 19,
  "counted_machines_international_anycast": 10,
  "counted_machines_unlocated": 6,
  "note_on_country_counts": "Country counts exclude two pseudo-categories: 'International' (worldwide anycast: Cloudflare, Google, Apple...) and 'Unknown' (names that no longer resolve and whose location we cannot evidence — we do not infer a country from an operator's name). A country enters the count only once at least one machine has been observed there. Filter counted=true AND country NOT IN ('International','Unknown') to reproduce them."
 },
 "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/"
 ],
 "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.",
 "vantage_disagreements": [],
 "aliases": [
  {
   "alias": "time1.google.com",
   "machine": "time.google.com"
  },
  {
   "alias": "minuto.roa.es",
   "machine": "ntp.roa.es"
  },
  {
   "alias": "time.belnet.be",
   "machine": "ntp.belnet.be"
  },
  {
   "alias": "ntp-public-1.oma.be",
   "machine": "ntp1.oma.be"
  },
  {
   "alias": "ntp-public-2.oma.be",
   "machine": "ntp2.oma.be"
  },
  {
   "alias": "ntp.univ-lyon1.fr",
   "machine": "ntp.insa-lyon.fr"
  },
  {
   "alias": "time1.esa.int",
   "machine": "time.esa.int"
  },
  {
   "alias": "ntp-pool.rdem-systems.com",
   "machine": "ntp-10.rdem-systems.com"
  },
  {
   "alias": "ntp1.rdem-systems.com",
   "machine": "ntp-1.rdem-systems.com"
  },
  {
   "alias": "ntp2.rdem-systems.com",
   "machine": "ntp-2.rdem-systems.com"
  },
  {
   "alias": "ntp3.rdem-systems.com",
   "machine": "ntp-3.rdem-systems.com"
  },
  {
   "alias": "ntp4.rdem-systems.com",
   "machine": "ntp-4.rdem-systems.com"
  },
  {
   "alias": "ntp5.rdem-systems.com",
   "machine": "ntp-5.rdem-systems.com"
  },
  {
   "alias": "ntp6.rdem-systems.com",
   "machine": "ntp-6.rdem-systems.com"
  },
  {
   "alias": "ntp8.rdem-systems.com",
   "machine": "ntp-8.rdem-systems.com"
  },
  {
   "alias": "ntp9.rdem-systems.com",
   "machine": "ntp-9.rdem-systems.com"
  },
  {
   "alias": "ntp10.rdem-systems.com",
   "machine": "ntp-10.rdem-systems.com"
  },
  {
   "alias": "ntp11.rdem-systems.com",
   "machine": "ntp-11.rdem-systems.com"
  },
  {
   "alias": "ntp7.rdem-systems.com",
   "machine": "ntp-7.rdem-systems.com"
  },
  {
   "alias": "tik.cesnet.cz",
   "machine": "ntp.cesnet.cz"
  },
  {
   "alias": "ntp1.funet.fi",
   "machine": "ntp.funet.fi"
  },
  {
   "alias": "it.pool.ntp.org",
   "machine": "time.cloudflare.com"
  },
  {
   "alias": "pl.pool.ntp.org",
   "machine": "tempus1.gum.gov.pl"
  },
  {
   "alias": "ro.pool.ntp.org",
   "machine": "time.cloudflare.com"
  },
  {
   "alias": "ie.pool.ntp.org",
   "machine": "time.cloudflare.com"
  },
  {
   "alias": "cz.pool.ntp.org",
   "machine": "time.cloudflare.com"
  },
  {
   "alias": "ht-time01.isnic.is",
   "machine": "time0.ntp.is"
  },
  {
   "alias": "mh-time01.isnic.is",
   "machine": "time1.ntp.is"
  },
  {
   "alias": "ntp.unistra.fr",
   "machine": "ntp1.unistra.fr"
  },
  {
   "alias": "ntp2.ffmuc.net",
   "machine": "ntp1.ffmuc.net"
  },
  {
   "alias": "ntp1.rrze.uni-erlangen.de",
   "machine": "ntp1.fau.de"
  },
  {
   "alias": "ntp2.rrze.uni-erlangen.de",
   "machine": "ntp2.fau.de"
  },
  {
   "alias": "nts1.time.nl",
   "machine": "nts.time.nl"
  },
  {
   "alias": "ntp1.litnet.lt",
   "machine": "ntp.litnet.lt"
  },
  {
   "alias": "ntp2.litnet.lt",
   "machine": "ntp.litnet.lt"
  },
  {
   "alias": "ntp1.ien.it",
   "machine": "ntp1.inrim.it"
  },
  {
   "alias": "ntp2.ien.it",
   "machine": "ntp2.inrim.it"
  },
  {
   "alias": "time.apple.com",
   "machine": "time.euro.apple.com"
  },
  {
   "alias": "ntp.teambelgium.net",
   "machine": "nts.teambelgium.net"
  },
  {
   "alias": "ntps1-0.uni-erlangen.de",
   "machine": "ntp0.fau.de"
  },
  {
   "alias": "ntps1-1.uni-erlangen.de",
   "machine": "ntp1.fau.de"
  },
  {
   "alias": "ntp2.stratum1.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp3.stratum1.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp4.stratum1.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp5.stratum1.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp1.stratum2.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp2.stratum2.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp3.stratum2.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp4.stratum2.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp5.stratum2.ru",
   "machine": "ntp1.stratum1.ru"
  },
  {
   "alias": "ntp.linx.net",
   "machine": "ntp2.linx.net"
  },
  {
   "alias": "ntp.de-cix.net",
   "machine": "ptbtime1.ptb.de"
  },
  {
   "alias": "ntp1.de-cix.net",
   "machine": "ptbtime1.ptb.de"
  },
  {
   "alias": "ntp2.de-cix.net",
   "machine": "ptbtime2.ptb.de"
  },
  {
   "alias": "ntp.netnod.se",
   "machine": "ntp.se"
  }
 ],
 "results": [
  {
   "host": "time.cloudflare.com",
   "ip": "162.159.200.1",
   "status": "OK",
   "stratum": 3,
   "refid": "10.219.8.4",
   "root_dispersion_ms": 0.29,
   "rtt_ms": 3.5,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "International",
   "operator": "Cloudflare",
   "type": "anycast",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 7.0,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Google",
   "type": "anycast",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 11.0,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Google",
   "type": "alias",
   "counted": false,
   "alias_of": "time.google.com",
   "nts_from": "0/6",
   "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": 6.9,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Google",
   "type": "service endpoint",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "reachable_from": "6/6"
  },
  {
   "host": "time3.google.com",
   "ip": "216.239.35.8",
   "status": "OK",
   "stratum": 1,
   "refid": "GOOG",
   "root_dispersion_ms": 0.12,
   "rtt_ms": 6.8,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Google",
   "type": "service endpoint",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 8.1,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Google",
   "type": "service endpoint",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "reachable_from": "6/6"
  },
  {
   "host": "time.euro.apple.com",
   "ip": "17.253.108.125",
   "status": "OK",
   "stratum": 1,
   "refid": "GPSs",
   "root_dispersion_ms": 0.11,
   "rtt_ms": 1.9,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Apple",
   "type": "regional service alias",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "reachable_from": "6/6"
  },
  {
   "host": "time.facebook.com",
   "ip": "129.134.29.123",
   "status": "OK",
   "stratum": 1,
   "refid": "MAN2",
   "root_dispersion_ms": 0.02,
   "rtt_ms": 14.2,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "International",
   "operator": "Meta",
   "type": "anycast",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 0.84,
   "rtt_ms": 8.4,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "refused",
   "country": "United Kingdom",
   "operator": "Canonical",
   "type": "managed service alias",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 4.1,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "France",
   "operator": "System76",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 19.5,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "Germany",
   "operator": "PTB",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 19.5,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "Germany",
   "operator": "PTB",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 19.5,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "Germany",
   "operator": "PTB",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 23.1,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": true,
   "nts_detail": "yes",
   "country": "Germany",
   "operator": "PTB",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 28.2,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "anycast",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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",
   "counted": true,
   "alias_of": null,
   "nts_from": "6/6",
   "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": 31.9,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 35.0,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 27.9,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 28.4,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 36.4,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
   "nts": false,
   "nts_detail": "silent",
   "country": "Sweden",
   "operator": "Netnod",
   "type": "server",
   "counted": true,
   "alias_of": null,
   "nts_from": "0/6",
   "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": 36.4,
   "ipv4": true,
   "ipv6_aaaa": true,
   "ipv6_answers": true,
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}