{"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":"143.203.12.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/143.203.12.0-143.203.15.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-10-07)"},"current_holder":{"rir":"ARIN","org":"TFLM","handle":"LPTRM-1","how":"RDAP, looked up 2026-10-09 20:14 UTC"},"rdap_snapshots":[{"resource_type":"ipv4","start_key":"0000000000000000000000008fcb0c00","end_key":"0000000000000000000000008fcb0fff","captured_at":"2026-10-09T20:14:37+00:00","reason":"first","authoritative_rir":"ARIN","handle":"NET-143-203-12-0-1","name":"TFLM-NETBLOCK-01","status":"active","org_handle":"LPTRM-1","org_name":"TFLM","registration_date":"2026-10-07T09:14:17-04:00","last_changed_date":"2026-10-07T09:14:17-04:00","rdap_url":"https://rdap.arin.net/registry/ip/143.203.12.0"},{"resource_type":"ipv4","start_key":"0000000000000000000000008fcb0c00","end_key":"0000000000000000000000008fcb0fff","captured_at":"2026-10-09T20:14:03+00:00","reason":"first","authoritative_rir":"ARIN","handle":"NET-143-203-12-0-1","name":"TFLM-NETBLOCK-01","status":"active","org_handle":"LPTRM-1","org_name":"TFLM","registration_date":"2026-10-07T09:14:17-04:00","last_changed_date":"2026-10-07T09:14:17-04:00","rdap_url":"https://rdap.arin.net/registry/ip/143.203.12.0"}],"transfers":[],"events":[{"event_id":"bf50dbdaed53725b","report_date":"2026-10-07","source":"arin_issued","raw_action":"ADD","raw_line":"Add 143.203.12.0-143.203.15.255","resource_type":"ipv4","resource":"143.203.12.0/22","start":"143.203.12.0","end":"143.203.15.255","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":true,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:28+00:00","page":"https://rirtracker.com/ip/143.203.12.0-143.203.15.255/#e-bf50dbdaed53725b","evidence_url":"https://rirtracker.com/api/v1/events/bf50dbdaed53725b.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2026-10-06 and allocated (dated 2026-10-07) on 2026-10-08. The tracker saw this range released from hold on 2026-10-02 (143.203.0.0-143.203.63.255), 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-October/006511.html","retrieved_at":"2026-10-09T18:54:11+00:00","summary":"ARIN-Issued report for 2026-10-07: \"Add 143.203.12.0-143.203.15.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261006","retrieved_at":"2026-10-09T19:08:46+00:00","summary":"ARIN delegated statistics 2026-10-06 (produced 2026-10-06T13:00:21+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261008","retrieved_at":"2026-10-09T19:08:53+00:00","summary":"ARIN delegated statistics 2026-10-08 (produced 2026-10-08T13:00:23+00:00), after the report: allocated (dated 2026-10-07)"}]},{"event_id":"7e2d375d7d47c37c","report_date":"2026-10-07","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 143.203.12.0-143.203.15.255","resource_type":"ipv4","resource":"143.203.12.0/22","start":"143.203.12.0","end":"143.203.15.255","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":true,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:27+00:00","page":"https://rirtracker.com/ip/143.203.12.0-143.203.15.255/#e-7e2d375d7d47c37c","evidence_url":"https://rirtracker.com/api/v1/events/7e2d375d7d47c37c.json","explanation":"ARIN's statistics show it reserved on 2026-10-06 and allocated (dated 2026-10-07) on 2026-10-08. ARIN removed its own pool record for this range as part of issuing it: the same report adds 143.203.12.0-143.203.15.255. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-October/006511.html","retrieved_at":"2026-10-09T18:54:11+00:00","summary":"ARIN-Issued report for 2026-10-07: \"Remove 143.203.12.0-143.203.15.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261006","retrieved_at":"2026-10-09T19:08:46+00:00","summary":"ARIN delegated statistics 2026-10-06 (produced 2026-10-06T13:00:21+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261008","retrieved_at":"2026-10-09T19:08:53+00:00","summary":"ARIN delegated statistics 2026-10-08 (produced 2026-10-08T13:00:23+00:00), after the report: allocated (dated 2026-10-07)"}]}],"classification_history":{"bf50dbdaed53725b":[{"raw_change_id":5617,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:28+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2026-10-06 and allocated (dated 2026-10-07) on 2026-10-08. The tracker saw this range released from hold on 2026-10-02 (143.203.0.0-143.203.63.255), so it appears to have been issued again from ARIN's pool."}],"7e2d375d7d47c37c":[{"raw_change_id":5585,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:27+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2026-10-06 and allocated (dated 2026-10-07) on 2026-10-08. ARIN removed its own pool record for this range as part of issuing it: the same report adds 143.203.12.0-143.203.15.255. The issuance is explained on that line."}]}}