{"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":"131.143.46.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/131.143.46.0-131.143.46.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"reserved"},"current_holder":{"rir":null,"org":null,"how":null},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"a492c3a509a3dfea","report_date":"2026-06-08","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"131.143.46.0/24","start":"131.143.46.0","end":"131.143.46.255","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":"2026-10-09T19:28:30+00:00","page":"https://rirtracker.com/ip/131.143.46.0-131.143.46.255/#e-a492c3a509a3dfea","evidence_url":"https://rirtracker.com/api/v1/events/a492c3a509a3dfea.json","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_days":60,"estimated_hold_end":"2026-08-07","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 allocated (dated 2026-01-13) on 2026-06-07 and reserved on 2026-06-09. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 for 60 days before reissuing them, so the earliest estimated hold expiration is 2026-08-07. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260609","retrieved_at":"2026-10-09T19:02:35+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 131.143.46.0/24 allocated on 2026-06-08, reserved on 2026-06-09"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260607","retrieved_at":"2026-10-09T19:02:28+00:00","summary":"ARIN delegated statistics 2026-06-07 (produced 2026-06-07T09:00:20+00:00), before the report: allocated (dated 2026-01-13)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260609","retrieved_at":"2026-10-09T19:02:35+00:00","summary":"ARIN delegated statistics 2026-06-09 (produced 2026-06-09T09:00:19+00:00), after the report: reserved"}]},{"event_id":"02780a269367adca","report_date":"2026-01-13","source":"arin_issued","raw_action":"ADD","raw_line":"Add 131.143.46.0-131.143.46.255","resource_type":"ipv4","resource":"131.143.46.0/24","start":"131.143.46.0","end":"131.143.46.255","classification":"APPARENT_NEW_ISSUANCE","classification_label":"Apparent new issuance","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":"2026-10-09T19:28:17+00:00","page":"https://rirtracker.com/ip/131.143.46.0-131.143.46.255/#e-02780a269367adca","evidence_url":"https://rirtracker.com/api/v1/events/02780a269367adca.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-January/006240.html","retrieved_at":"2026-10-09T18:53:52+00:00","summary":"ARIN-Issued report for 2026-01-13: \"Add 131.143.46.0-131.143.46.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260112","retrieved_at":"2026-10-09T18:54:51+00:00","summary":"ARIN delegated statistics 2026-01-12 (produced 2026-01-12T14:00:47+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260114","retrieved_at":"2026-10-09T18:54:57+00:00","summary":"ARIN delegated statistics 2026-01-14 (produced 2026-01-14T14:00:47+00:00), after the report: allocated (dated 2026-01-13)"}]},{"event_id":"5c70a084f2915aca","report_date":"2026-01-13","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 131.143.46.0-131.143.46.255","resource_type":"ipv4","resource":"131.143.46.0/24","start":"131.143.46.0","end":"131.143.46.255","classification":"POOL_RECORD_CHANGE","classification_label":"Change to ARIN's own pool record","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Part of the issuance reported the same day","inventory_effect_code":"PAIRED","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:17+00:00","page":"https://rirtracker.com/ip/131.143.46.0-131.143.46.255/#e-5c70a084f2915aca","evidence_url":"https://rirtracker.com/api/v1/events/5c70a084f2915aca.json","explanation":"ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. ARIN removed its own pool record for this range as part of issuing it: the same report adds 131.143.46.0-131.143.46.255. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-January/006240.html","retrieved_at":"2026-10-09T18:53:52+00:00","summary":"ARIN-Issued report for 2026-01-13: \"Remove 131.143.46.0-131.143.46.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260112","retrieved_at":"2026-10-09T18:54:51+00:00","summary":"ARIN delegated statistics 2026-01-12 (produced 2026-01-12T14:00:47+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260114","retrieved_at":"2026-10-09T18:54:57+00:00","summary":"ARIN delegated statistics 2026-01-14 (produced 2026-01-14T14:00:47+00:00), after the report: allocated (dated 2026-01-13)"}]}],"classification_history":{"a492c3a509a3dfea":[{"raw_change_id":6815,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:30+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 allocated (dated 2026-01-13) on 2026-06-07 and reserved on 2026-06-09. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 for 60 days before reissuing them, so the earliest estimated hold expiration is 2026-08-07. This does not confirm availability."}],"02780a269367adca":[{"raw_change_id":176,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:17+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."}],"5c70a084f2915aca":[{"raw_change_id":110,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:17+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. ARIN removed its own pool record for this range as part of issuing it: the same report adds 131.143.46.0-131.143.46.255. The issuance is explained on that line."}]}}