{"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":"151.173.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/151.173.0.0-151.173.255.255/","statistics_now":{"registry":"RIPE NCC","status":"allocated (dated 1991-09-05)"},"current_holder":{"rir":"RIPE NCC","org":null,"how":"The RIPE NCC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":55796,"date":"2017-12-12T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Saudi Telecom Company JSC","range":"151.173.0.0/17","log":"RIPE NCC"},{"id":11623,"date":"2017-12-12T16:17:32Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"Arnold & Porter Kaye Scholer LLP","recipient_org":"Saudi Telecom Company JSC","range":"151.173.0.0/17","log":"ARIN"},{"id":55436,"date":"2017-11-21T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Saudi Telecom Company JSC","range":"151.173.128.0/17","log":"RIPE NCC"},{"id":11413,"date":"2017-11-21T17:45:03Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"Arnold & Porter Kaye Scholer LLP","recipient_org":"Saudi Telecom Company JSC","range":"151.173.128.0/17","log":"ARIN"},{"id":9524,"date":"2017-05-19T14:29:48Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Arnold & Porter","recipient_org":"Arnold & Porter Kaye Scholer LLP","range":"151.173.0.0/16","log":"ARIN"}],"events":[{"event_id":"16d91db01583935b","registry":"ARIN","report_date":"2017-05-19","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"151.173.0.0/16","start":"151.173.0.0","end":"151.173.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Arnold & Porter","recipient_organization":"Arnold & Porter Kaye Scholer LLP","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:29+00:00","page":"https://rirtracker.com/ip/151.173.0.0-151.173.255.255/#e-16d91db01583935b","report_page":"https://rirtracker.com/arin/reports/2017-05-19/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/151.173.0.0-151.173.255.255.json","observed":"Merger/acquisition: Arnold & Porter (ARIN) to Arnold & Porter Kaye Scholer LLP (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Arnold & Porter (ARIN) to Arnold & Porter Kaye Scholer LLP (ARIN) on 2017-05-19 14:29 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 2017-05-19 14:29 UTC, Arnold & Porter (ARIN) to Arnold & Porter Kaye Scholer LLP (ARIN); resources moved: 151.173.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170518.gz","retrieved_at":"2026-10-12T21:28:19+00:00","summary":"ARIN delegated statistics 2017-05-18 (produced 2017-05-18T05:10:01+00:00), before the report: assigned (dated 1991-09-05)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170520.gz","retrieved_at":"2026-10-12T21:28:24+00:00","summary":"ARIN delegated statistics 2017-05-20 (produced 2017-05-20T05:10:01+00:00), after the report: assigned (dated 1991-09-05)"}]}],"classification_history":{"16d91db01583935b":[{"raw_change_id":551957,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:29+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Arnold & Porter (ARIN) to Arnold & Porter Kaye Scholer LLP (ARIN) on 2017-05-19 14:29 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":"not listed"}}