{"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":"143.203.224.0 - 143.203.251.255","resource_type":"ipv4","page":"https://rirtracker.com/ip/143.203.224.0-143.203.251.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-10-05), reserved"},"current_holder":{"rir":null,"org":null,"how":null},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"3b0916c1887792ee","report_date":"2026-10-05","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 143.203.224.0-143.203.251.255","resource_type":"ipv4","resource":"143.203.224.0 - 143.203.251.255","start":"143.203.224.0","end":"143.203.251.255","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":"2026-10-09T19:28:26+00:00","page":"https://rirtracker.com/ip/143.203.224.0-143.203.251.255/#e-3b0916c1887792ee","evidence_url":"https://rirtracker.com/api/v1/events/3b0916c1887792ee.json","explanation":"ARIN's statistics show it reserved on 2026-10-04 and allocated (dated 2026-10-05), reserved on 2026-10-06. ARIN removed its own pool record for this range as part of issuing it: the same report adds 143.203.228.0-143.203.231.255, 143.203.236.0-143.203.239.255, 143.203.240.0-143.203.243.255, 143.203.244.0-143.203.247.255 and 1 more. The issuance is explained on those lines.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-October/006509.html","retrieved_at":"2026-10-09T18:54:11+00:00","summary":"ARIN-Issued report for 2026-10-05: \"Remove 143.203.224.0-143.203.251.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261004","retrieved_at":"2026-10-09T19:08:40+00:00","summary":"ARIN delegated statistics 2026-10-04 (produced 2026-10-04T13:00:21+00:00), before the report: reserved"},{"type":"delegated_after","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), after the report: allocated (dated 2026-10-05), reserved"}]}],"classification_history":{"3b0916c1887792ee":[{"raw_change_id":5155,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:26+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2026-10-04 and allocated (dated 2026-10-05), reserved on 2026-10-06. ARIN removed its own pool record for this range as part of issuing it: the same report adds 143.203.228.0-143.203.231.255, 143.203.236.0-143.203.239.255, 143.203.240.0-143.203.243.255, 143.203.244.0-143.203.247.255 and 1 more. The issuance is explained on those lines."}]}}