{"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":"AS400453","resource_type":"asn","page":"https://rirtracker.com/asn/400453/","arin_statistics_now":{"file_date":"2026-10-09","status":"assigned (dated 2026-02-20)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's statistics for 2026-10-09"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"8c8675e3bda1ad26","report_date":"2026-02-20","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS400453","resource_type":"asn","resource":"AS400453","start":400453,"end":400453,"classification":"APPARENT_REISSUANCE","classification_label":"Apparent reissuance of previously removed resource","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","page":"https://rirtracker.com/asn/400453/#e-8c8675e3bda1ad26","evidence_url":"https://rirtracker.com/api/v1/events/8c8675e3bda1ad26.json","explanation":"No transfer record matches. ARIN's statistics show it available on 2026-02-19 and assigned (dated 2026-02-20) on 2026-02-21. The tracker saw this range released from hold on 2026-02-11 (AS400453), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-February/006278.html","retrieved_at":"2026-10-09T18:53:54+00:00","summary":"ARIN-Issued report for 2026-02-20: \"Add AS400453\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260219","retrieved_at":"2026-10-09T18:56:52+00:00","summary":"ARIN delegated statistics 2026-02-19 (produced 2026-02-19T14:00:48+00:00), before the report: available"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260221","retrieved_at":"2026-10-09T18:56:58+00:00","summary":"ARIN delegated statistics 2026-02-21 (produced 2026-02-21T14:00:51+00:00), after the report: assigned (dated 2026-02-20)"}]},{"event_id":"47c015e192605b69","report_date":"2026-02-11","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS400453","resource_type":"asn","resource":"AS400453","start":400453,"end":400453,"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":"2026-10-09T19:28:18+00:00","page":"https://rirtracker.com/asn/400453/#e-47c015e192605b69","evidence_url":"https://rirtracker.com/api/v1/events/47c015e192605b69.json","explanation":"ARIN's statistics show it reserved on 2026-02-10 and available on 2026-02-12. 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 2026-02-04, 7 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-February/006269.html","retrieved_at":"2026-10-09T18:53:54+00:00","summary":"ARIN-Issued report for 2026-02-11: \"Remove AS400453\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260210","retrieved_at":"2026-10-09T18:56:25+00:00","summary":"ARIN delegated statistics 2026-02-10 (produced 2026-02-10T14:00:51+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260212","retrieved_at":"2026-10-09T18:56:31+00:00","summary":"ARIN delegated statistics 2026-02-12 (produced 2026-02-12T14:00:51+00:00), after the report: available"}]},{"event_id":"5a330976bd3d1a95","report_date":"2026-02-04","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS400453","start":400453,"end":400453,"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":"2026-10-09T19:28:28+00:00","page":"https://rirtracker.com/asn/400453/#e-5a330976bd3d1a95","evidence_url":"https://rirtracker.com/api/v1/events/5a330976bd3d1a95.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":"2026-08-04","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 2022-02-15) on 2026-02-03 and reserved on 2026-02-05. 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 2026-08-04. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260205","retrieved_at":"2026-10-09T18:56:08+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS400453 assigned on 2026-02-04, reserved on 2026-02-05"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260203","retrieved_at":"2026-10-09T18:56:01+00:00","summary":"ARIN delegated statistics 2026-02-03 (produced 2026-02-03T14:00:49+00:00), before the report: assigned (dated 2022-02-15)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260205","retrieved_at":"2026-10-09T18:56:08+00:00","summary":"ARIN delegated statistics 2026-02-05 (produced 2026-02-05T14:00:51+00:00), after the report: reserved"}]}],"classification_history":{"8c8675e3bda1ad26":[{"raw_change_id":886,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2026-02-19 and assigned (dated 2026-02-20) on 2026-02-21. The tracker saw this range released from hold on 2026-02-11 (AS400453), so it appears to have been issued again from ARIN's pool."}],"47c015e192605b69":[{"raw_change_id":737,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2026-02-10 and available on 2026-02-12. 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 2026-02-04, 7 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."}],"5a330976bd3d1a95":[{"raw_change_id":5896,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:28+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 2022-02-15) on 2026-02-03 and reserved on 2026-02-05. 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 2026-08-04. This does not confirm availability."}]}}