{"classifier_version":"1.4.0","documentation":"https://rirtracker.com/api/","disclaimer":"This site independently analyzes publicly available Internet number-resource records. It is not affiliated with or endorsed by ARIN, the RIPE NCC, APNIC, LACNIC, AFRINIC, the Number Resource Organization (NRO), or any other 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":"166.231.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/166.231.0.0-166.231.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2025-04-07)"},"current_holder":{"rir":"ARIN","org":"T-Mobile USA, Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":41274,"date":"2025-09-11T15:44:16Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"USCC Services, LLC","recipient_org":"T-Mobile USA, Inc.","range":"166.231.0.0/16","log":"ARIN"},{"id":39967,"date":"2025-04-07T16:04:52Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Wireless Data Service Provider Corporation","recipient_org":"UNITED STATES CELLULAR TELEPHONE COMPANY (GREATER KNOXVILLE), L.P.","range":"166.231.0.0/16","log":"ARIN"},{"id":34571,"date":"2024-02-28T17:52:43Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Service Provider Corporation","recipient_org":"Wireless Data Service Provider Corporation","range":"166.128.0.0/9","log":"ARIN"}],"events":[{"event_id":"afafd86badf2258b","registry":"ARIN","report_date":"2025-09-11","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"166.231.0.0/16","start":"166.231.0.0","end":"166.231.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"USCC Services, LLC","recipient_organization":"T-Mobile USA, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:23+00:00","page":"https://rirtracker.com/ip/166.231.0.0-166.231.255.255/#e-afafd86badf2258b","report_page":"https://rirtracker.com/arin/reports/2025-09-11/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/166.231.0.0-166.231.255.255.json","observed":"Merger/acquisition: USCC Services, LLC (ARIN) to T-Mobile USA, Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from USCC Services, LLC (ARIN) to T-Mobile USA, Inc. (ARIN) on 2025-09-11 15:44 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.","evidence":[{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-13T13:57:20+00:00","summary":"Transfer log: MERGER_ACQUISITION on 2025-09-11 15:44 UTC, USCC Services, LLC (ARIN) to T-Mobile USA, Inc. (ARIN); resources moved: 166.231.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250910.gz","retrieved_at":"2026-10-13T00:06:33+00:00","summary":"ARIN delegated statistics 2025-09-10 (produced 2025-09-10T13:00:51+00:00), before the report: allocated (dated 2025-04-07)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250912.gz","retrieved_at":"2026-10-13T00:06:38+00:00","summary":"ARIN delegated statistics 2025-09-12 (produced 2025-09-12T13:00:51+00:00), after the report: allocated (dated 2025-04-07)"}]}],"classification_history":{"afafd86badf2258b":[{"raw_change_id":574272,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:23+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from USCC Services, LLC (ARIN) to T-Mobile USA, Inc. (ARIN) on 2025-09-11 15:44 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it."}]},"arin_statistics_now":{"status":"allocated (dated 2025-04-07)"}}