{"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":"170.138.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/170.138.0.0-170.138.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 1994-05-18)"},"current_holder":{"rir":"ARIN","org":"UnitedHealth Group Incorporated","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":40452,"date":"2025-05-20T19:23:12Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"ActaMed Corp.","recipient_org":"UnitedHealth Group Incorporated","range":"170.138.0.0/16","log":"ARIN"}],"events":[{"event_id":"2d3d6e714f06f2da","registry":"ARIN","report_date":"2025-05-20","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"170.138.0.0/16","start":"170.138.0.0","end":"170.138.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"ActaMed Corp.","recipient_organization":"UnitedHealth Group Incorporated","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:22+00:00","page":"https://rirtracker.com/ip/170.138.0.0-170.138.255.255/#e-2d3d6e714f06f2da","report_page":"https://rirtracker.com/arin/reports/2025-05-20/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/170.138.0.0-170.138.255.255.json","observed":"Merger/acquisition: ActaMed Corp. (ARIN) to UnitedHealth Group Incorporated (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from ActaMed Corp. (ARIN) to UnitedHealth Group Incorporated (ARIN) on 2025-05-20 19:23 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 2025-05-20 19:23 UTC, ActaMed Corp. (ARIN) to UnitedHealth Group Incorporated (ARIN); resources moved: 170.138.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250519.gz","retrieved_at":"2026-10-13T00:00:09+00:00","summary":"ARIN delegated statistics 2025-05-19 (produced 2025-05-19T13:01:09+00:00), before the report: allocated (dated 1994-05-18)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250521.gz","retrieved_at":"2026-10-13T00:00:14+00:00","summary":"ARIN delegated statistics 2025-05-21 (produced 2025-05-21T13:01:11+00:00), after the report: allocated (dated 1994-05-18)"}]}],"classification_history":{"2d3d6e714f06f2da":[{"raw_change_id":573685,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:22+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from ActaMed Corp. (ARIN) to UnitedHealth Group Incorporated (ARIN) on 2025-05-20 19:23 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 1994-05-18)"}}