{"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":"168.151.32.0/21","resource_type":"ipv4","page":"https://rirtracker.com/ip/168.151.32.0-168.151.39.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-06-23)"},"current_holder":{"rir":"ARIN","org":"Southwest Airlines Co.","how":"ARIN's statistics for 2026-10-09 and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":44429,"date":"2026-06-23T19:28:42Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Big Sky Services, Inc.","recipient_org":"Southwest Airlines Co.","range":"168.151.32.0/21"},{"id":41652,"date":"2025-10-10T20:04:39Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Intelligence Network, Inc.","recipient_org":"Big Sky Services, Inc.","range":"168.151.32.0/21"}],"events":[{"event_id":"94c3668fa703ae9b","report_date":"2026-06-23","source":"arin_issued","raw_action":"ADD","raw_line":"Add 168.151.32.0-168.151.39.255","resource_type":"ipv4","resource":"168.151.32.0/21","start":"168.151.32.0","end":"168.151.39.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Big Sky Services, Inc.","recipient_organization":"Southwest Airlines Co.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:20+00:00","page":"https://rirtracker.com/ip/168.151.32.0-168.151.39.255/#e-94c3668fa703ae9b","evidence_url":"https://rirtracker.com/api/v1/events/94c3668fa703ae9b.json","explanation":"ARIN's transfer log records a transfer from Big Sky Services, Inc. (ARIN) to Southwest Airlines Co. (ARIN) on 2026-06-23 19:28 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2026-June/006405.html","retrieved_at":"2026-10-09T18:54:03+00:00","summary":"ARIN-Issued report for 2026-06-23: \"Add 168.151.32.0-168.151.39.255\""},{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-09T18:54:15+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2026-06-23 19:28 UTC, Big Sky Services, Inc. (ARIN) to Southwest Airlines Co. (ARIN); resources moved: 168.151.32.0/21"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260622","retrieved_at":"2026-10-09T19:03:16+00:00","summary":"ARIN delegated statistics 2026-06-22 (produced 2026-06-22T09:00:20+00:00), before the report: allocated (dated 1994-04-04)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260624","retrieved_at":"2026-10-09T19:03:23+00:00","summary":"ARIN delegated statistics 2026-06-24 (produced 2026-06-24T09:00:20+00:00), after the report: allocated (dated 2026-06-23)"}]}],"classification_history":{"94c3668fa703ae9b":[{"raw_change_id":2434,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:20+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Big Sky Services, Inc. (ARIN) to Southwest Airlines Co. (ARIN) on 2026-06-23 19:28 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]}}