{
 "dataset": "European time sources — NTS / IPv6 / stratum",
 "measured_at": "2026-08-05",
 "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": 5148,
  "counted_machines": 3709,
  "nts": 200,
  "nts_verdict": "authenticated-time",
  "nts_ke_only": 13,
  "nts_ke": 212,
  "ntp_time": 3174,
  "vantages_with_time_measure": 6,
  "vantages_total": 6,
  "majority_rule": "two thirds of the vantage points that actually performed the measurement",
  "nts_raw_do_not_publish": 367,
  "aliases_resolved": 1053,
  "european_countries": 39,
  "european_countries_with_nts": 23,
  "european_countries_without_nts": 16,
  "counted_machines_international_anycast": 6,
  "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": [
  {
   "host": "ecs-101-44-222-53.compute.hwclouds-dns.com",
   "layer": "clear-time",
   "ntp_time_from": "3/5",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "102.222.156.151",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "fides.hadeka.id",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-ielo"
   ]
  },
  {
   "host": "103.186.65.246",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "local",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ]
  },
  {
   "host": "103.221.223.143",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "local",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ]
  },
  {
   "host": "ntp1.glypnod.com",
   "layer": "authenticated-time",
   "nts_time_from": "1/6",
   "agree": [
    "local"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "11.85.36.104.crunchbits.us",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "106.54.244.49",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion"
   ]
  },
  {
   "host": "ec.sedley.net",
   "layer": "clear-time",
   "ntp_time_from": "3/6",
   "agree": [
    "local",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo",
    "ns-rds"
   ]
  },
  {
   "host": "108.160.132.224.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "108.61.215.221.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "capricieux.magi-reco.com",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "ns-arelion",
    "ns-contabo"
   ],
   "disagree": [
    "local",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ]
  },
  {
   "host": "ntp1.unix-solutions.be",
   "layer": "clear-time",
   "ntp_time_from": "4/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "host-109-89-176-131.dynamic.voo.be",
   "layer": "clear-time",
   "ntp_time_from": "1/6",
   "agree": [
    "ns-ipset"
   ],
   "disagree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "110.42.98.138",
   "layer": "clear-time",
   "ntp_time_from": "3/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-rds"
   ],
   "disagree": [
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ]
  },
  {
   "host": "114.132.167.4",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-rds"
   ]
  },
  {
   "host": "114.66.25.29",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "time5.cloud.tencent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "ecs-119-8-229-131.compute.hwclouds-dns.com",
   "layer": "clear-time",
   "ntp_time_from": "3/5",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "122-199-30-29.ip4.superloop.au",
   "layer": "clear-time",
   "ntp_time_from": "3/5",
   "agree": [
    "local",
    "ns-contabo",
    "ns-ielo"
   ],
   "disagree": [
    "ns-ipset",
    "ns-rds"
   ]
  },
  {
   "host": "time.smartini.it",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "local",
    "ns-arelion"
   ],
   "disagree": [
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ]
  },
  {
   "host": "ntp2.cam.ac.uk",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "mobielc03f0eb22ed5.roaming.utwente.nl",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-rds"
   ]
  },
  {
   "host": "131.180.14.10",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-rds"
   ]
  },
  {
   "host": "ntp0.rrze.uni-erlangen.de",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-contabo"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "ntp1.rrze.uni-erlangen.de",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-contabo"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "ntp3.rrze.uni-erlangen.de",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-contabo"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "ntp1.jussieu.fr",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "138.3.209.153",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "ns-arelion",
    "ns-ipset"
   ],
   "disagree": [
    "local",
    "ns-contabo",
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "138.3.216.120",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-ielo"
   ]
  },
  {
   "host": "139.84.231.68.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "ntp.cynz.de",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "ntp.lntgn.ca",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "143.110.241.116",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "local",
    "ns-ipset"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-rds"
   ]
  },
  {
   "host": "144.202.41.38.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "144.202.62.209.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "144.202.66.214.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "ntp.pads.ufrj.br",
   "layer": "clear-time",
   "ntp_time_from": "4/6",
   "agree": [
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local",
    "ns-arelion"
   ]
  },
  {
   "host": "ntp1.vmar.se",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-rds"
   ]
  },
  {
   "host": "omega.mas.bg.ac.rs",
   "layer": "clear-time",
   "ntp_time_from": "4/6",
   "agree": [
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local",
    "ns-arelion"
   ]
  },
  {
   "host": "63.14.71.148.rev.vodafone.pt",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-rds"
   ]
  },
  {
   "host": "149.248.12.167.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "149.28.200.179.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "149.28.61.105.vultrusercontent.com",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "nts1.roa.es",
   "layer": "authenticated-time",
   "nts_time_from": "4/6",
   "agree": [
    "local",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion",
    "ns-contabo"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "152.42.247.214",
   "layer": "clear-time",
   "ntp_time_from": "2/6",
   "agree": [
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local",
    "ns-arelion",
    "ns-contabo",
    "ns-ielo"
   ]
  },
  {
   "host": "mail.jabber-germany.de",
   "layer": "authenticated-time",
   "nts_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ],
   "details": [
    "no-source",
    "time"
   ]
  },
  {
   "host": "mail.jabber-germany.de",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ]
  },
  {
   "host": "mail.jabber-germany.de",
   "layer": "nts-ke",
   "nts_from": "5/6",
   "agree": [
    "ns-arelion",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "local"
   ],
   "details": [
    "silent",
    "yes"
   ]
  },
  {
   "host": "157.245.125.229",
   "layer": "clear-time",
   "ntp_time_from": "4/6",
   "agree": [
    "local",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset"
   ],
   "disagree": [
    "ns-arelion",
    "ns-rds"
   ]
  },
  {
   "host": "ecs-159-138-166-199.compute.hwclouds-dns.com",
   "layer": "clear-time",
   "ntp_time_from": "4/5",
   "agree": [
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion"
   ]
  },
  {
   "host": "ntp.whyza.net",
   "layer": "clear-time",
   "ntp_time_from": "5/6",
   "agree": [
    "local",
    "ns-contabo",
    "ns-ielo",
    "ns-ipset",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion"
   ]
  },
  {
   "host": "megaptera.irb.hr",
   "layer": "clear-time",
   "ntp_time_from": "3/6",
   "agree": [
    "local",
    "ns-contabo",
    "ns-rds"
   ],
   "disagree": [
    "ns-arelion",
    "ns-ielo",
    "ns-ipset"
   ]
  },
  {
   "host": "gu.irb.hr",
   "layer": "clear-time",
   "ntp_time_from": "3/6",
   "agree": [
    "local",
    "ns-contabo",
    "ns-ielo"
   ],
   "disagree": [
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   "machine": "ntp.sophia.cnrs.fr"
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   "alias": "web2021.hotspotsystem.com",
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   "alias": "196.10.99.182.teraco.co.za",
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   "alias": "ns1.iway.na",
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   "alias": "time.xmission.com",
   "machine": "clock.xmission.com"
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   "alias": "rolex.usg.edu",
   "machine": "ns1.usg.edu"
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   "alias": "ip-14-18.telehouse.bg",
   "machine": "ntp1.bmt.services"
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   "alias": "gps.ntp.br",
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   "alias": "ntp.spbrasil.com.br",
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   "alias": "ntp.cais.rnp.br",
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   "alias": "200.20.186.76",
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   "alias": "mail.undernet.uy",
   "machine": "ntp.undernet.uy"
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   "alias": "ov-f4ee87.infomaniak.ch",
   "machine": "ntp.securo.ovh"
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   "alias": "2001:1600:16:10::6db",
   "machine": "ntp.gut.digital"
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   "alias": "83-228-250-108.dc3-a.pub2.infomaniak.cloud",
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   "alias": "eudyptula.init7.net",
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   "alias": "aquila.init7.net",
   "machine": "ntp2.init7.net"
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   "alias": "2001:1838:2000:41b::123:0",
   "machine": "tick.chi1.ntfo.org"
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   "alias": "ntps.hojmark.net",
   "machine": "ntp3.sin.sg.hojmark.net"
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   "alias": "mail.rondie.nl",
   "machine": "ntp.rondie.nl"
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   "alias": "ntpt.hojmark.net",
   "machine": "ntp1.lax.us.hojmark.net"
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   "alias": "2001:19f0:7001:3e71::1",
   "machine": "tama.paina.net"
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   "alias": "mail.aster.edu.pl",
   "machine": "ntp.aster.edu.pl"
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   "alias": "ntpr.hojmark.net",
   "machine": "ntp1.yyz.ca.hojmark.net"
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   "alias": "mail.novg.net",
   "machine": "ntp1.novg.net"
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   "alias": "clock61.infonet.ee",
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   "alias": "clock62.infonet.ee",
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   "alias": "moe.nexellent.net",
   "machine": "ns1.nexellent.net"
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   "alias": "2001:418:8405:4002::12",
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   "alias": "server2.ledow.org.uk",
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   "alias": "main.arcanite.ch",
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   "alias": "vps1.websters-computers.com",
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   "alias": "silas.dioptre.fr",
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   "alias": "gerdi.space",
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   "alias": "2001:41d0:a:56ae::200",
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   "alias": "536cb48a.bb.online.no",
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   "alias": "time-east.zia.io",
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   "alias": "tunnel547749-pt.tunnel.tserv4.nyc4.ipv6.he.net",
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