{
    "dataset": "RDEM Systems NTS pool — live availability, offset and TLS certificates",
    "license": "CC BY 4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "RDEM Systems SAS — https://ntp.rdem-systems.com/status.php",
    "landing_page": "https://ntp.rdem-systems.com/status.php",
    "probe_interval_seconds": 300,
    "method": {
        "nts": "Two steps, reported separately. (1) NTS-KE over TLS 1.3, ALPN ntske/1, port 4460, certificate chain and hostname validated. (2) An actual NTS-authenticated NTP request, via the reference client, on each IP family. NTS works if and only if AUTHENTICATED time is obtained: a complete key exchange over a filtered UDP/123 yields no time at all.",
        "ntp": "SNTP query on port 123, best of 5 shots (minimum RTT).",
        "offset": "Milliseconds between the server clock and our probe host (itself synchronised). A residual offset on a single family (v4 or v6) usually reflects routing asymmetry, not clock drift.",
        "scope": "RDEM Systems servers only. This feed measures our own infrastructure — it is self-reported, unlike the European registry which measures third parties from six networks."
    },
    "see_also": {
        "european_registry_csv": "https://ntp.rdem-systems.com/downloads/ntp-europe-inventory.csv",
        "european_registry_json": "https://ntp.rdem-systems.com/downloads/ntp-europe-latest.json"
    },
    "snapshot": {
        "generated_at": "2026-08-13T04:20:01+00:00",
        "datacenters": {
            "PA4": {
                "label": "Paris PA4",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            },
            "PA3": {
                "label": "Paris PA3",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            },
            "PA5": {
                "label": "Paris PA5",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            },
            "TH2": {
                "label": "Paris TH2",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            },
            "FRA": {
                "label": "Frankfurt (OVH)",
                "city": "Frankfurt",
                "country": "DE",
                "flag": "🇩🇪"
            },
            "HQ": {
                "label": "HQ (Île-de-France)",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            },
            "CTB": {
                "label": "Contabo (FR)",
                "city": "Paris",
                "country": "FR",
                "flag": "🇫🇷"
            }
        },
        "asns": {
            "206014": {
                "name": "RDEM Systems",
                "short": "RDEM"
            },
            "1299": {
                "name": "Arelion",
                "short": "Arelion"
            },
            "174": {
                "name": "Cogent",
                "short": "Cogent"
            },
            "29075": {
                "name": "IELO",
                "short": "IELO"
            },
            "199275": {
                "name": "IPSET",
                "short": "IPSET"
            },
            "16276": {
                "name": "OVH",
                "short": "OVH"
            },
            "12322": {
                "name": "Free/Proxad",
                "short": "Free"
            },
            "51167": {
                "name": "Contabo",
                "short": "Contabo"
            }
        },
        "servers": [
            {
                "host": "ntp-0.rdem-systems.com",
                "node": "ntp-0.hq",
                "dc": "HQ",
                "role": "server",
                "asns": [
                    12322
                ],
                "members": null,
                "nts": false,
                "families": {
                    "inet": {
                        "family": "inet",
                        "ip": "82.65.124.136",
                        "reachable": 1,
                        "stratum": 1,
                        "offset_ms": -0.339,
                        "rtt_ms": 4.3616,
                        "leap": 0,
                        "root_delay_ms": 0,
                        "root_disp_ms": 1.022,
                        "refid": "PPS",
                        "error": "tls: Connection timed out",
                        "nts_ke_ok": 0,
                        "nts_time_ok": null,
                        "nts_time_detail": "not-expected"
                    }
                },
                "cert": null
            },
            {
                "host": "ntp-1.rdem-systems.com",
                "node": "rtr-01.pa4",
                "dc": "PA4",
                "role": "server",
                "asns": [
                    206014,
                    1299
                ],
                "members": null,
                "nts": true,
                "families": {
                    "inet": {
                        "family": "inet",
                        "ip": "45.13.156.1",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": 0.5965,
                        "rtt_ms": 0.7172,
                        "leap": 0,
                        "root_delay_ms": 15.488,
                        "root_disp_ms": 2.258,
                        "refid": "160.183.135.154",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 8.2,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": 0.587
                    },
                    "inet6": {
                        "family": "inet6",
                        "ip": "2a00:6420:ffff:ffff::1",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": 0.5736,
                        "rtt_ms": 0.8144,
                        "leap": 0,
                        "root_delay_ms": 15.488,
                        "root_disp_ms": 2.258,
                        "refid": "160.183.135.154",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 5.3,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": 0.623
                    }
                },
                "cert": {
                    "subject": "*.rdem-systems.be",
                    "match_name": "*.rdem-systems.com",
                    "issuer": "Let's Encrypt / YE1",
                    "sans": [
                        "*.ntp-pool.rdem-systems.be",
                        "*.ntp-pool.rdem-systems.biz",
                        "*.ntp-pool.rdem-systems.com",
                        "*.ntp-pool.rdem-systems.eu",
                        "*.ntp-pool.rdem-systems.fr",
                        "*.ntp-pool.rdem-systems.info",
                        "*.ntp-pool.rdem-systems.net",
                        "*.ntp-pool.rdem-systems.org",
                        "*.rdem-systems.be",
                        "*.rdem-systems.biz",
                        "*.rdem-systems.com",
                        "*.rdem-systems.eu",
                        "*.rdem-systems.fr",
                        "*.rdem-systems.info",
                        "*.rdem-systems.net",
                        "*.rdem-systems.org"
                    ],
                    "not_before": "2026-06-20 06:53:27",
                    "not_after": "2026-09-18 06:53:26",
                    "days_left": 36,
                    "fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                    "name_match": 1
                }
            },
            {
                "host": "ntp-2.rdem-systems.com",
                "node": "rtr-02.pa4",
                "dc": "PA4",
                "role": "server",
                "asns": [
                    206014,
                    1299,
                    199275
                ],
                "members": null,
                "nts": true,
                "families": {
                    "inet": {
                        "family": "inet",
                        "ip": "45.13.156.2",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": 0.1101,
                        "rtt_ms": 0.9241,
                        "leap": 0,
                        "root_delay_ms": 15.03,
                        "root_disp_ms": 1.282,
                        "refid": "160.183.135.154",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 5.5,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": 0.186
                    },
                    "inet6": {
                        "family": "inet6",
                        "ip": "2a00:6420:ffff:ffff::2",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": 0.1876,
                        "rtt_ms": 0.9837,
                        "leap": 0,
                        "root_delay_ms": 15.03,
                        "root_disp_ms": 1.297,
                        "refid": "160.183.135.154",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 5.9,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": 0.146
                    }
                },
                "cert": {
                    "subject": "*.rdem-systems.be",
                    "match_name": "*.rdem-systems.com",
                    "issuer": "Let's Encrypt / YE1",
                    "sans": [
                        "*.ntp-pool.rdem-systems.be",
                        "*.ntp-pool.rdem-systems.biz",
                        "*.ntp-pool.rdem-systems.com",
                        "*.ntp-pool.rdem-systems.eu",
                        "*.ntp-pool.rdem-systems.fr",
                        "*.ntp-pool.rdem-systems.info",
                        "*.ntp-pool.rdem-systems.net",
                        "*.ntp-pool.rdem-systems.org",
                        "*.rdem-systems.be",
                        "*.rdem-systems.biz",
                        "*.rdem-systems.com",
                        "*.rdem-systems.eu",
                        "*.rdem-systems.fr",
                        "*.rdem-systems.info",
                        "*.rdem-systems.net",
                        "*.rdem-systems.org"
                    ],
                    "not_before": "2026-06-20 06:53:27",
                    "not_after": "2026-09-18 06:53:26",
                    "days_left": 36,
                    "fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                    "name_match": 1
                }
            },
            {
                "host": "ntp-9.rdem-systems.com",
                "node": "ns-arelion",
                "dc": "PA4",
                "role": "server",
                "asns": [
                    1299
                ],
                "members": null,
                "nts": true,
                "families": {
                    "inet": {
                        "family": "inet",
                        "ip": "195.12.227.213",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": -0.1565,
                        "rtt_ms": 1.3497,
                        "leap": 0,
                        "root_delay_ms": 1.633,
                        "root_disp_ms": 0.793,
                        "refid": "145.238.80.80",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 6.8,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": -0.084
                    },
                    "inet6": {
                        "family": "inet6",
                        "ip": "2001:2035::1a34:0:0:0:3",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": -0.2103,
                        "rtt_ms": 1.4462,
                        "leap": 0,
                        "root_delay_ms": 1.633,
                        "root_disp_ms": 0.793,
                        "refid": "145.238.80.80",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 6.5,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": -0.241
                    }
                },
                "cert": {
                    "subject": "*.rdem-systems.be",
                    "match_name": "*.rdem-systems.com",
                    "issuer": "Let's Encrypt / YE1",
                    "sans": [
                        "*.ntp-pool.rdem-systems.be",
                        "*.ntp-pool.rdem-systems.biz",
                        "*.ntp-pool.rdem-systems.com",
                        "*.ntp-pool.rdem-systems.eu",
                        "*.ntp-pool.rdem-systems.fr",
                        "*.ntp-pool.rdem-systems.info",
                        "*.ntp-pool.rdem-systems.net",
                        "*.ntp-pool.rdem-systems.org",
                        "*.rdem-systems.be",
                        "*.rdem-systems.biz",
                        "*.rdem-systems.com",
                        "*.rdem-systems.eu",
                        "*.rdem-systems.fr",
                        "*.rdem-systems.info",
                        "*.rdem-systems.net",
                        "*.rdem-systems.org"
                    ],
                    "not_before": "2026-06-20 06:53:27",
                    "not_after": "2026-09-18 06:53:26",
                    "days_left": 36,
                    "fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                    "name_match": 1
                }
            },
            {
                "host": "ntp-3.rdem-systems.com",
                "node": "rtr-01.pa3",
                "dc": "PA3",
                "role": "server",
                "asns": [
                    206014,
                    29075
                ],
                "members": null,
                "nts": true,
                "families": {
                    "inet": {
                        "family": "inet",
                        "ip": "45.13.156.3",
                        "reachable": 1,
                        "stratum": 2,
                        "offset_ms": -0.0012,
                        "rtt_ms": 0.8907,
                        "leap": 0,
                        "root_delay_ms": 9.14,
                        "root_disp_ms": 2.426,
                        "refid": "92.21.53.217",
                        "error": null,
                        "nts_ke_ok": 1,
                        "nts_ke_ms": 5.9,
                        "cert_subject": "*.rdem-systems.be",
                        "cert_issuer": "Let's Encrypt / YE1",
                        "cert_sans": [
                            "*.ntp-pool.rdem-systems.be",
                            "*.ntp-pool.rdem-systems.biz",
                            "*.ntp-pool.rdem-systems.com",
                            "*.ntp-pool.rdem-systems.eu",
                            "*.ntp-pool.rdem-systems.fr",
                            "*.ntp-pool.rdem-systems.info",
                            "*.ntp-pool.rdem-systems.net",
                            "*.ntp-pool.rdem-systems.org",
                            "*.rdem-systems.be",
                            "*.rdem-systems.biz",
                            "*.rdem-systems.com",
                            "*.rdem-systems.eu",
                            "*.rdem-systems.fr",
                            "*.rdem-systems.info",
                            "*.rdem-systems.net",
                            "*.rdem-systems.org"
                        ],
                        "cert_not_before": "2026-06-20 06:53:27",
                        "cert_not_after": "2026-09-18 06:53:26",
                        "cert_days_left": 36,
                        "cert_fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                        "cert_name_match": 1,
                        "cert_match_name": "*.rdem-systems.com",
                        "nts_time_ok": 1,
                        "nts_time_detail": "time",
                        "nts_offset_ms": -0.007
                    },
                    "inet6": {
                        "family": "inet6",
                        "ip": "2a00:6420:ffff:ffff::3",
                        "reachable": 1,
                        "stratum": 2,
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                                "fp_sha256": "9E:D2:E2:BA:D9:43:DF:45:15:D1:F1:7F:84:6D:E2:01:2E:C2:0F:24:2F:66:11:73:89:A7:8C:AA:18:34:EC:09",
                                "error": null,
                                "checked_at": 1786594968
                            }
                        }
                    },
                    "members_total": 2,
                    "members_valid": 2,
                    "cert_ok": true,
                    "cert_min_days": 36
                }
            }
        ]
    }
}