{"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":"192.197.250.0/23","resource_type":"ipv4","page":"https://rirtracker.com/ip/192.197.250.0-192.197.251.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 1994-05-16)"},"current_holder":{"rir":"ARIN","org":"LUNENFELD TANENBAUM RESEARCH INSTITUTE","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":37317,"date":"2024-11-21T12:36:59Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Samuel Lunenfeld Research Institute of Mount Sinai Hospital","recipient_org":"LUNENFELD TANENBAUM RESEARCH INSTITUTE","range":"192.197.250.0/23","log":"ARIN"}],"events":[{"event_id":"43ee93b78c7e3359","registry":"ARIN","report_date":"2024-11-21","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"192.197.250.0/23","start":"192.197.250.0","end":"192.197.251.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"The Samuel Lunenfeld Research Institute of Mount Sinai Hospital","recipient_organization":"LUNENFELD TANENBAUM RESEARCH INSTITUTE","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:18+00:00","page":"https://rirtracker.com/ip/192.197.250.0-192.197.251.255/#e-43ee93b78c7e3359","report_page":"https://rirtracker.com/arin/reports/2024-11-21/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/192.197.250.0-192.197.251.255.json","observed":"Merger/acquisition: The Samuel Lunenfeld Research Institute of Mount Sinai Hospital (ARIN) to LUNENFELD TANENBAUM RESEARCH INSTITUTE (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from The Samuel Lunenfeld Research Institute of Mount Sinai Hospital (ARIN) to LUNENFELD TANENBAUM RESEARCH INSTITUTE (ARIN) on 2024-11-21 12:36 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 2024-11-21 12:36 UTC, The Samuel Lunenfeld Research Institute of Mount Sinai Hospital (ARIN) to LUNENFELD TANENBAUM RESEARCH INSTITUTE (ARIN); resources moved: 192.197.250.0/23"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20241120.gz","retrieved_at":"2026-10-12T23:50:17+00:00","summary":"ARIN delegated statistics 2024-11-20 (produced 2024-11-20T14:01:07+00:00), before the report: allocated (dated 1994-05-16)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20241122.gz","retrieved_at":"2026-10-12T23:50:22+00:00","summary":"ARIN delegated statistics 2024-11-22 (produced 2024-11-22T14:00:54+00:00), after the report: allocated (dated 1994-05-16)"}]}],"classification_history":{"43ee93b78c7e3359":[{"raw_change_id":572063,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:18+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from The Samuel Lunenfeld Research Institute of Mount Sinai Hospital (ARIN) to LUNENFELD TANENBAUM RESEARCH INSTITUTE (ARIN) on 2024-11-21 12:36 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 1994-05-16)"}}