{"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":"155.103.140.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/155.103.140.0-155.103.143.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-01-15)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's statistics for 2026-10-09"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"c0ddbf2ca85be573","report_date":"2026-01-15","source":"arin_issued","raw_action":"ADD","raw_line":"Add 155.103.140.0-155.103.143.255","resource_type":"ipv4","resource":"155.103.140.0/22","start":"155.103.140.0","end":"155.103.143.255","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":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:17+00:00","page":"https://rirtracker.com/ip/155.103.140.0-155.103.143.255/#e-c0ddbf2ca85be573","evidence_url":"https://rirtracker.com/api/v1/events/c0ddbf2ca85be573.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2026-01-14 and allocated (dated 2026-01-15) on 2026-01-16. The tracker saw this range released from hold on 2026-01-13 (155.103.0.0-155.103.255.255), 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-January/006242.html","retrieved_at":"2026-10-09T18:53:52+00:00","summary":"ARIN-Issued report for 2026-01-15: \"Add 155.103.140.0-155.103.143.255\""},{"type":"delegated_before","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), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260116","retrieved_at":"2026-10-09T18:55:04+00:00","summary":"ARIN delegated statistics 2026-01-16 (produced 2026-01-16T14:00:49+00:00), after the report: allocated (dated 2026-01-15)"}]},{"event_id":"a83a5ff61fe1a4a2","report_date":"2026-01-15","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 155.103.140.0-155.103.143.255","resource_type":"ipv4","resource":"155.103.140.0/22","start":"155.103.140.0","end":"155.103.143.255","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/155.103.140.0-155.103.143.255/#e-a83a5ff61fe1a4a2","evidence_url":"https://rirtracker.com/api/v1/events/a83a5ff61fe1a4a2.json","explanation":"ARIN's statistics show it reserved on 2026-01-14 and allocated (dated 2026-01-15) on 2026-01-16. ARIN removed its own pool record for this range as part of issuing it: the same report adds 155.103.140.0-155.103.143.255. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-January/006242.html","retrieved_at":"2026-10-09T18:53:52+00:00","summary":"ARIN-Issued report for 2026-01-15: \"Remove 155.103.140.0-155.103.143.255\""},{"type":"delegated_before","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), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260116","retrieved_at":"2026-10-09T18:55:04+00:00","summary":"ARIN delegated statistics 2026-01-16 (produced 2026-01-16T14:00:49+00:00), after the report: allocated (dated 2026-01-15)"}]}],"classification_history":{"c0ddbf2ca85be573":[{"raw_change_id":337,"classification_code":"APPARENT_REISSUANCE","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 2026-01-14 and allocated (dated 2026-01-15) on 2026-01-16. The tracker saw this range released from hold on 2026-01-13 (155.103.0.0-155.103.255.255), so it appears to have been issued again from ARIN's pool."}],"a83a5ff61fe1a4a2":[{"raw_change_id":315,"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 2026-01-14 and allocated (dated 2026-01-15) on 2026-01-16. ARIN removed its own pool record for this range as part of issuing it: the same report adds 155.103.140.0-155.103.143.255. The issuance is explained on that line."}]}}