{"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":"67.158.51.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/67.158.51.0-67.158.51.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2017-12-28)"},"current_holder":{"rir":"ARIN","org":"Concentra Health Services, Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":44082,"date":"2026-05-29T12:25:51Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Select Medical Corporation","recipient_org":"Concentra Health Services, Inc.","range":"67.158.51.0/24","log":"ARIN"},{"id":11732,"date":"2017-12-28T13:26:56Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Servmatix LLC.","recipient_org":"Select Medical Corporation","range":"67.158.51.0/24","log":"ARIN"},{"id":11188,"date":"2017-10-20T19:35:41Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Servmatix Inc.","recipient_org":"Servmatix LLC.","range":"67.158.48.0/20","log":"ARIN"}],"events":[{"event_id":"b4a1d542c068ea5b","registry":"ARIN","report_date":"2026-05-29","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"67.158.51.0/24","start":"67.158.51.0","end":"67.158.51.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Select Medical Corporation","recipient_organization":"Concentra Health Services, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:28+00:00","page":"https://rirtracker.com/ip/67.158.51.0-67.158.51.255/#e-b4a1d542c068ea5b","report_page":"https://rirtracker.com/arin/reports/2026-05-29/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/67.158.51.0-67.158.51.255.json","observed":"Merger/acquisition: Select Medical Corporation (ARIN) to Concentra Health Services, Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Select Medical Corporation (ARIN) to Concentra Health Services, Inc. (ARIN) on 2026-05-29 12:25 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 2026-05-29 12:25 UTC, Select Medical Corporation (ARIN) to Concentra Health Services, Inc. (ARIN); resources moved: 67.158.51.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260528","retrieved_at":"2026-10-09T19:01:57+00:00","summary":"ARIN delegated statistics 2026-05-28 (produced 2026-05-28T13:00:21+00:00), before the report: allocated (dated 2017-12-28)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260530","retrieved_at":"2026-10-09T19:02:03+00:00","summary":"ARIN delegated statistics 2026-05-30 (produced 2026-05-30T13:00:19+00:00), after the report: allocated (dated 2017-12-28)"}]},{"event_id":"69cd6493222a5d60","registry":"ARIN","report_date":"2017-12-28","source":"arin_issued","raw_action":"ADD","raw_line":"Add 67.158.51.0-67.158.51.255","resource_type":"ipv4","resource":"67.158.51.0/24","start":"67.158.51.0","end":"67.158.51.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Servmatix LLC.","recipient_organization":"Select Medical Corporation","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:02+00:00","page":"https://rirtracker.com/ip/67.158.51.0-67.158.51.255/#e-69cd6493222a5d60","report_page":"https://rirtracker.com/arin/reports/2017-12-28/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/67.158.51.0-67.158.51.255.json","piece_of":{"resource":"67.158.48.0/20","page":"https://rirtracker.com/ip/67.158.48.0-67.158.63.255/"},"explanation":"ARIN's transfer log records a transfer from Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN) on 2017-12-28 13:26 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/2017-December/003305.html","retrieved_at":"2026-10-12T18:39:53+00:00","summary":"ARIN-Issued report for 2017-12-28: \"Add 67.158.51.0-67.158.51.255\""},{"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 2017-12-28 13:26 UTC, Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN); resources moved: 67.158.51.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20171227.gz","retrieved_at":"2026-10-12T21:39:24+00:00","summary":"ARIN delegated statistics 2017-12-27 (produced 2017-12-27T06:08:20+00:00), before the report: allocated (dated 2010-04-01)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20171229.gz","retrieved_at":"2026-10-12T21:39:29+00:00","summary":"ARIN delegated statistics 2017-12-29 (produced 2017-12-29T06:08:48+00:00), after the report: assigned (dated 2017-12-28)"}]}],"classification_history":{"b4a1d542c068ea5b":[{"raw_change_id":576193,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:28+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Select Medical Corporation (ARIN) to Concentra Health Services, Inc. (ARIN) on 2026-05-29 12:25 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."}],"69cd6493222a5d60":[{"raw_change_id":152574,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:39:56+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN) on 2017-12-28 13:26 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":152574,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:11+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN) on 2017-12-28 13:26 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":152574,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:52+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN) on 2017-12-28 13:26 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":152574,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:02+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Servmatix LLC. (ARIN) to Select Medical Corporation (ARIN) on 2017-12-28 13:26 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 2017-12-28)"}}