{"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":"192.54.81.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/192.54.81.0-192.54.81.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-04-02)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's statistics for 2026-10-09"},"rdap_snapshots":[],"transfers":[{"id":17447,"date":"2019-04-18T15:08:35Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Colorado Alliance of Research Libraries","recipient_org":"CARL Corporation","range":"192.54.81.0/24"}],"events":[{"event_id":"12460e9e4b4be9f0","report_date":"2026-04-02","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 192.54.81.0-192.54.81.255","resource_type":"ipv4","resource":"192.54.81.0/24","start":"192.54.81.0","end":"192.54.81.255","classification":"NO_MATERIAL_CHANGE","classification_label":"No substantive resource change found","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:19+00:00","page":"https://rirtracker.com/ip/192.54.81.0-192.54.81.255/#e-12460e9e4b4be9f0","evidence_url":"https://rirtracker.com/api/v1/events/12460e9e4b4be9f0.json","explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved).","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-April/006320.html","retrieved_at":"2026-10-09T18:53:59+00:00","summary":"ARIN-Issued report for 2026-04-02: \"Remove 192.54.81.0-192.54.81.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260401","retrieved_at":"2026-10-09T18:59:10+00:00","summary":"ARIN delegated statistics 2026-04-01 (produced 2026-04-01T13:00:38+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260403","retrieved_at":"2026-10-09T18:59:17+00:00","summary":"ARIN delegated statistics 2026-04-03 (produced 2026-04-03T13:00:39+00:00), after the report: reserved"}]}],"classification_history":{"12460e9e4b4be9f0":[{"raw_change_id":1451,"classification_code":"NO_MATERIAL_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:19+00:00","current":1,"public_explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved)."}]}}