{"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":"63.251.236.0/23","resource_type":"ipv4","page":"https://rirtracker.com/ip/63.251.236.0-63.251.237.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2024-02-08)"},"current_holder":{"rir":"ARIN","org":"Roswell Park Cancer Institute","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":34405,"date":"2024-02-08T13:06:56Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Unitas Global","recipient_org":"Roswell Park Cancer Institute","range":"63.251.236.0/23","log":"ARIN"},{"id":30256,"date":"2023-01-23T17:52:05Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Internap Holding LLC","recipient_org":"Unitas Global","range":"63.251.236.0/23","log":"ARIN"},{"id":16462,"date":"2018-11-29T13:45:51Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Internap Network Services Corporation","recipient_org":"Internap Corporation","range":"63.251.0.0/16","log":"ARIN"}],"events":[{"event_id":"c5b3b804a6010b67","registry":"ARIN","report_date":"2024-02-08","source":"arin_issued","raw_action":"ADD","raw_line":"Add 63.251.236.0-63.251.237.255","resource_type":"ipv4","resource":"63.251.236.0/23","start":"63.251.236.0","end":"63.251.237.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Unitas Global","recipient_organization":"Roswell Park Cancer Institute","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:58+00:00","page":"https://rirtracker.com/ip/63.251.236.0-63.251.237.255/#e-c5b3b804a6010b67","report_page":"https://rirtracker.com/arin/reports/2024-02-08/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/63.251.236.0-63.251.237.255.json","explanation":"ARIN's transfer log records a transfer from Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN) on 2024-02-08 13:06 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/2024-February/005536.html","retrieved_at":"2026-10-12T18:42:29+00:00","summary":"ARIN-Issued report for 2024-02-08: \"Add 63.251.236.0-63.251.237.255\""},{"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: RESOURCE_TRANSFER on 2024-02-08 13:06 UTC, Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN); resources moved: 63.251.236.0/23"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240207.gz","retrieved_at":"2026-10-12T23:34:44+00:00","summary":"ARIN delegated statistics 2024-02-07 (produced 2024-02-07T14:00:43+00:00), before the report: allocated (dated 1999-12-02)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240209.gz","retrieved_at":"2026-10-12T23:34:59+00:00","summary":"ARIN delegated statistics 2024-02-09 (produced 2024-02-09T14:00:43+00:00), after the report: allocated (dated 2024-02-08)"}]},{"event_id":"a688da11d0473b0f","registry":"ARIN","report_date":"2023-01-23","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"63.251.236.0/23","start":"63.251.236.0","end":"63.251.237.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Internap Holding LLC","recipient_organization":"Unitas Global","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:06+00:00","page":"https://rirtracker.com/ip/63.251.236.0-63.251.237.255/#e-a688da11d0473b0f","report_page":"https://rirtracker.com/arin/reports/2023-01-23/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/63.251.236.0-63.251.237.255.json","observed":"Merger/acquisition: Internap Holding LLC (ARIN) to Unitas Global (ARIN)","piece_of":{"resource":"63.251.0.0/16","page":"https://rirtracker.com/ip/63.251.0.0-63.251.255.255/"},"explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Internap Holding LLC (ARIN) to Unitas Global (ARIN) on 2023-01-23 17:52 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 2023-01-23 17:52 UTC, Internap Holding LLC (ARIN) to Unitas Global (ARIN); resources moved: 63.251.236.0/23"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230122.gz","retrieved_at":"2026-10-12T23:14:38+00:00","summary":"ARIN delegated statistics 2023-01-22 (produced 2023-01-22T14:00:10+00:00), before the report: allocated (dated 1999-12-02)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230124.gz","retrieved_at":"2026-10-12T23:14:43+00:00","summary":"ARIN delegated statistics 2023-01-24 (produced 2023-01-24T14:00:10+00:00), after the report: allocated (dated 1999-12-02)"}]}],"classification_history":{"c5b3b804a6010b67":[{"raw_change_id":185470,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T04:01:04+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN) on 2024-02-08 13:06 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":185470,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:38+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN) on 2024-02-08 13:06 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":185470,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:30+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN) on 2024-02-08 13:06 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":185470,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:58+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Unitas Global (ARIN) to Roswell Park Cancer Institute (ARIN) on 2024-02-08 13:06 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}],"a688da11d0473b0f":[{"raw_change_id":567201,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:06+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Internap Holding LLC (ARIN) to Unitas Global (ARIN) on 2023-01-23 17:52 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 2024-02-08)"}}