{"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":"137.252.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/137.252.0.0-137.252.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2016-10-26)"},"current_holder":{"rir":"ARIN","org":"Cerner Corporation","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":8066,"date":"2016-10-26T15:34:13Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"PLR IP Holdings, LLC","recipient_org":"Cerner Corporation","range":"137.252.0.0/16","log":"ARIN"},{"id":7541,"date":"2016-08-10T19:24:04Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Polaroid Corporation","recipient_org":"PLR IP Holdings, LLC","range":"137.252.0.0/16","log":"ARIN"}],"events":[{"event_id":"3e4277a989c13f2d","registry":"ARIN","report_date":"2016-10-26","source":"arin_issued","raw_action":"ADD","raw_line":"Add 137.252.0.0-137.252.255.255","resource_type":"ipv4","resource":"137.252.0.0/16","start":"137.252.0.0","end":"137.252.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"PLR IP Holdings, LLC","recipient_organization":"Cerner Corporation","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:39+00:00","page":"https://rirtracker.com/ip/137.252.0.0-137.252.255.255/#e-3e4277a989c13f2d","report_page":"https://rirtracker.com/arin/reports/2016-10-26/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/137.252.0.0-137.252.255.255.json","explanation":"ARIN's transfer log records a transfer from PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN) on 2016-10-26 15:34 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/2016-October/002876.html","retrieved_at":"2026-10-12T18:39:23+00:00","summary":"ARIN-Issued report for 2016-10-26: \"Add 137.252.0.0-137.252.255.255\""},{"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 2016-10-26 15:34 UTC, PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN); resources moved: 137.252.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20161025.gz","retrieved_at":"2026-10-12T21:18:19+00:00","summary":"ARIN delegated statistics 2016-10-25 (produced 2016-10-25T05:09:34+00:00), before the report: assigned (dated 1990-01-17)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20161027.gz","retrieved_at":"2026-10-12T21:18:24+00:00","summary":"ARIN delegated statistics 2016-10-27 (produced 2016-10-27T05:09:46+00:00), after the report: assigned (dated 2016-10-26)"}]},{"event_id":"ec07d8cfdd477a63","registry":"ARIN","report_date":"2016-08-10","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"137.252.0.0/16","start":"137.252.0.0","end":"137.252.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Polaroid Corporation","recipient_organization":"PLR IP Holdings, LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:26+00:00","page":"https://rirtracker.com/ip/137.252.0.0-137.252.255.255/#e-ec07d8cfdd477a63","report_page":"https://rirtracker.com/arin/reports/2016-08-10/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/137.252.0.0-137.252.255.255.json","observed":"Merger/acquisition: Polaroid Corporation (ARIN) to PLR IP Holdings, LLC (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Polaroid Corporation (ARIN) to PLR IP Holdings, LLC (ARIN) on 2016-08-10 19:24 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 2016-08-10 19:24 UTC, Polaroid Corporation (ARIN) to PLR IP Holdings, LLC (ARIN); resources moved: 137.252.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160809.gz","retrieved_at":"2026-10-12T21:14:32+00:00","summary":"ARIN delegated statistics 2016-08-09 (produced 2016-08-09T05:09:54+00:00), before the report: assigned (dated 1990-01-17)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160811.gz","retrieved_at":"2026-10-12T21:14:37+00:00","summary":"ARIN delegated statistics 2016-08-11 (produced 2016-08-11T05:10:02+00:00), after the report: assigned (dated 1990-01-17)"}]}],"classification_history":{"3e4277a989c13f2d":[{"raw_change_id":146514,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:36:16+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN) on 2016-10-26 15:34 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146514,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:54+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN) on 2016-10-26 15:34 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146514,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:33+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN) on 2016-10-26 15:34 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146514,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:39+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from PLR IP Holdings, LLC (ARIN) to Cerner Corporation (ARIN) on 2016-10-26 15:34 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}],"ec07d8cfdd477a63":[{"raw_change_id":550564,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:26+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Polaroid Corporation (ARIN) to PLR IP Holdings, LLC (ARIN) on 2016-08-10 19:24 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 2016-10-26)"}}