{"classifier_version":"1.0.0","generated":"2026-10-09T21:19:22+00:00","documentation":"https://rirtracker.com/api/","disclaimer":"This site independently analyzes publicly available Internet number-resource records. It is not affiliated with or endorsed by the American Registry for Internet Numbers (ARIN), the Number Resource Organization (NRO), or any Regional Internet Registry. Classifications and hold-expiration dates are evidence-based interpretations and do not constitute confirmation that a resource is available for issuance or transfer.","resource":"AS399581","resource_type":"asn","page":"https://rirtracker.com/asn/399581/","arin_statistics_now":{"file_date":"2026-10-09","status":"reserved"},"current_holder":{"rir":null,"org":null,"how":null},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"ac1db18c728d1f1b","report_date":"2026-09-08","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS399581","resource_type":"asn","resource":"AS399581","start":399581,"end":399581,"classification":"HOLD_RELEASED","classification_label":"Released from hold (ARIN lists it as 'available')","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"ARIN's statistics now list it as 'available'; reissue not confirmed","inventory_effect_code":"RELEASED","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:24+00:00","page":"https://rirtracker.com/asn/399581/#e-ac1db18c728d1f1b","evidence_url":"https://rirtracker.com/api/v1/events/ac1db18c728d1f1b.json","explanation":"ARIN's statistics show it reserved on 2026-09-07 and available on 2026-09-09. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2026-04-16, 145 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-September/006482.html","retrieved_at":"2026-10-09T18:54:09+00:00","summary":"ARIN-Issued report for 2026-09-08: \"Remove AS399581\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260907","retrieved_at":"2026-10-09T19:07:16+00:00","summary":"ARIN delegated statistics 2026-09-07 (produced 2026-09-07T13:00:21+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260909","retrieved_at":"2026-10-09T19:07:22+00:00","summary":"ARIN delegated statistics 2026-09-09 (produced 2026-09-09T13:00:20+00:00), after the report: available"}]},{"event_id":"1dc1263c643176ff","report_date":"2026-04-16","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS399581","start":399581,"end":399581,"classification":"REMOVED_REASON_UNKNOWN","classification_label":"Removed (return, revocation or reclamation not publicly distinguishable)","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Possible future reissue candidate after hold","inventory_effect_code":"HOLD_CANDIDATE","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:29+00:00","page":"https://rirtracker.com/asn/399581/#e-1dc1263c643176ff","evidence_url":"https://rirtracker.com/api/v1/events/1dc1263c643176ff.json","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_months":6,"estimated_hold_end":"2026-10-16","availability_statement":"Possible reissue candidate after this date; not confirmed available"},"explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 2021-04-19) on 2026-04-15 and reserved on 2026-04-17. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2026-10-16. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260417","retrieved_at":"2026-10-09T19:00:02+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS399581 assigned on 2026-04-16, reserved on 2026-04-17"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260415","retrieved_at":"2026-10-09T18:59:57+00:00","summary":"ARIN delegated statistics 2026-04-15 (produced 2026-04-15T13:00:39+00:00), before the report: assigned (dated 2021-04-19)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260417","retrieved_at":"2026-10-09T19:00:02+00:00","summary":"ARIN delegated statistics 2026-04-17 (produced 2026-04-17T13:00:39+00:00), after the report: reserved"}]}],"classification_history":{"ac1db18c728d1f1b":[{"raw_change_id":4457,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:24+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2026-09-07 and available on 2026-09-09. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2026-04-16, 145 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."}],"1dc1263c643176ff":[{"raw_change_id":6441,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:29+00:00","current":1,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 2021-04-19) on 2026-04-15 and reserved on 2026-04-17. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2026-10-16. This does not confirm availability."}]}}