{"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":"48.100.0.0/15","resource_type":"ipv4","page":"https://rirtracker.com/ip/48.100.0.0-48.101.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2026-10-29)"},"current_holder":{"rir":"ARIN","org":"OpenAI OpCo, LLC","handle":"OOL-15","how":"RDAP, looked up 2026-11-06 18:18 UTC"},"rdap_snapshots":[{"resource_type":"ipv4","start_key":"00000000000000000000000030640000","end_key":"0000000000000000000000003065ffff","captured_at":"2026-11-06T18:18:04+00:00","reason":"7d","authoritative_rir":"ARIN","handle":"NET-48-100-0-0-1","name":"OPENAI","status":"active","org_handle":"OOL-15","org_name":"OpenAI OpCo, LLC","registration_date":"2026-10-29T10:04:34-04:00","last_changed_date":"2026-10-30T00:06:10-04:00","rdap_url":"https://rdap.arin.net/registry/ip/48.100.0.0"},{"resource_type":"ipv4","start_key":"00000000000000000000000030640000","end_key":"0000000000000000000000003065ffff","captured_at":"2026-10-31T18:21:38+00:00","reason":"24h","authoritative_rir":"ARIN","handle":"NET-48-100-0-0-1","name":"OPENAI","status":"active","org_handle":"OOL-15","org_name":"OpenAI OpCo, LLC","registration_date":"2026-10-29T10:04:34-04:00","last_changed_date":"2026-10-30T00:06:10-04:00","rdap_url":"https://rdap.arin.net/registry/ip/48.100.0.0"},{"resource_type":"ipv4","start_key":"00000000000000000000000030640000","end_key":"0000000000000000000000003065ffff","captured_at":"2026-10-30T18:17:52+00:00","reason":"first","authoritative_rir":"ARIN","handle":"NET-48-100-0-0-1","name":"OPENAI","status":"active","org_handle":"OOL-15","org_name":"OpenAI OpCo, LLC","registration_date":"2026-10-29T10:04:34-04:00","last_changed_date":"2026-10-30T00:06:10-04:00","rdap_url":"https://rdap.arin.net/registry/ip/48.100.0.0"}],"transfers":[{"id":134403,"date":"2026-10-29T14:04:34Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Prudential Insurance Company of America","recipient_org":"OpenAI OpCo, LLC","range":"48.100.0.0/15","log":"ARIN"}],"events":[{"event_id":"3a578c55f40f8e3e","registry":"ARIN","report_date":"2026-10-29","source":"arin_issued","raw_action":"ADD","raw_line":"Add 48.100.0.0-48.101.255.255","resource_type":"ipv4","resource":"48.100.0.0/15","start":"48.100.0.0","end":"48.101.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"The Prudential Insurance Company of America","recipient_organization":"OpenAI OpCo, LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-30T18:22:00+00:00","page":"https://rirtracker.com/ip/48.100.0.0-48.101.255.255/#e-3a578c55f40f8e3e","report_page":"https://rirtracker.com/arin/reports/2026-10-29/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/48.100.0.0-48.101.255.255.json","explanation":"ARIN's transfer log records a transfer from The Prudential Insurance Company of America (ARIN) to OpenAI OpCo, LLC (ARIN) on 2026-10-29 14:04 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-October/006533.html","retrieved_at":"2026-10-30T18:17:04+00:00","summary":"ARIN-Issued report for 2026-10-29: \"Add 48.100.0.0-48.101.255.255\""},{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-30T18:17:06+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2026-10-29 14:04 UTC, The Prudential Insurance Company of America (ARIN) to OpenAI OpCo, LLC (ARIN); resources moved: 48.100.0.0/15"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261028","retrieved_at":"2026-10-28T18:17:13+00:00","summary":"ARIN delegated statistics 2026-10-28 (produced 2026-10-28T13:00:21+00:00), before the report: allocated (dated 1990-12-07)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261030","retrieved_at":"2026-10-30T18:17:11+00:00","summary":"ARIN delegated statistics 2026-10-30 (produced 2026-10-30T13:00:20+00:00), after the report: allocated (dated 2026-10-29)"}]}],"classification_history":{"3a578c55f40f8e3e":[{"raw_change_id":579140,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-30T18:22:00+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from The Prudential Insurance Company of America (ARIN) to OpenAI OpCo, LLC (ARIN) on 2026-10-29 14:04 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2026-10-29)"}}