{"classifier_version":"1.0.0","generated":"2026-10-10T14:39:54+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":"174.144.0.0/12","resource_type":"ipv4","page":"https://rirtracker.com/ip/174.144.0.0-174.159.255.255/","arin_statistics_now":{"file_date":"2026-10-10","status":"allocated (dated 2026-02-11)"},"current_holder":{"rir":"ARIN","org":"Amazon.com, Inc.","how":"ARIN's statistics for 2026-10-10 and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":42821,"date":"2026-02-11T20:06:18Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"T-Mobile USA, Inc.","recipient_org":"Amazon.com, Inc.","range":"174.144.0.0/12"},{"id":22439,"date":"2020-12-31T20:17:58Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Sprint Communications, Inc.","recipient_org":"T-Mobile USA, Inc.","range":"174.144.0.0/12"}],"events":[{"event_id":"2ccba754e8659bdc","report_date":"2026-02-11","source":"arin_issued","raw_action":"ADD","raw_line":"Add 174.144.0.0-174.159.255.255","resource_type":"ipv4","resource":"174.144.0.0/12","start":"174.144.0.0","end":"174.159.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"T-Mobile USA, Inc.","recipient_organization":"Amazon.com, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","page":"https://rirtracker.com/ip/174.144.0.0-174.159.255.255/#e-2ccba754e8659bdc","evidence_url":"https://rirtracker.com/api/v1/events/2ccba754e8659bdc.json","explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to Amazon.com, Inc. (ARIN) on 2026-02-11 20:06 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-February/006269.html","retrieved_at":"2026-10-09T18:53:54+00:00","summary":"ARIN-Issued report for 2026-02-11: \"Add 174.144.0.0-174.159.255.255\""},{"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 2026-02-11 20:06 UTC, T-Mobile USA, Inc. (ARIN) to Amazon.com, Inc. (ARIN); resources moved: 174.144.0.0/12"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260210","retrieved_at":"2026-10-09T18:56:25+00:00","summary":"ARIN delegated statistics 2026-02-10 (produced 2026-02-10T14:00:51+00:00), before the report: allocated (dated 2008-07-23)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260212","retrieved_at":"2026-10-09T18:56:31+00:00","summary":"ARIN delegated statistics 2026-02-12 (produced 2026-02-12T14:00:51+00:00), after the report: allocated (dated 2026-02-11)"}]}],"classification_history":{"2ccba754e8659bdc":[{"raw_change_id":678,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to Amazon.com, Inc. (ARIN) on 2026-02-11 20:06 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]}}