{"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":"131.153.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/131.153.0.0-131.153.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2015-05-08), allocated (dated 2017-12-20), allocated (dated 2018-01-16), allocated (dated 2018-01-18), allocated (dated 2026-01-13)"},"current_holder":{"rir":"ARIN","org":"SECURED SERVERS LLC","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":11914,"date":"2018-01-18T18:05:11Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"SECURED SERVERS LLC","recipient_org":"Core & Main","range":"131.153.250.0/23","log":"ARIN"},{"id":11892,"date":"2018-01-16T18:05:44Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"SECURED SERVERS LLC","recipient_org":"Lubbock Emergency Communication District","range":"131.153.248.0/23","log":"ARIN"},{"id":11684,"date":"2017-12-20T17:02:47Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"SECURED SERVERS LLC","recipient_org":"Platform9","range":"131.153.252.0/22","log":"ARIN"},{"id":5699,"date":"2015-05-08T17:20:10Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Sematech, Inc.","recipient_org":"SECURED SERVERS LLC","range":"131.153.0.0/16","log":"ARIN"}],"events":[{"event_id":"ef3f680f13cf4252","registry":"ARIN","report_date":"2015-05-08","source":"arin_issued","raw_action":"ADD","raw_line":"Add 131.153.0.0-131.153.255.255","resource_type":"ipv4","resource":"131.153.0.0/16","start":"131.153.0.0","end":"131.153.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Sematech, Inc.","recipient_organization":"SECURED SERVERS LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:23+00:00","page":"https://rirtracker.com/ip/131.153.0.0-131.153.255.255/#e-ef3f680f13cf4252","report_page":"https://rirtracker.com/arin/reports/2015-05-08/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/131.153.0.0-131.153.255.255.json","explanation":"ARIN's transfer log records a transfer from Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN) on 2015-05-08 17:20 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/2015-May/002339.html","retrieved_at":"2026-10-12T18:38:47+00:00","summary":"ARIN-Issued report for 2015-05-08: \"Add 131.153.0.0-131.153.255.255\""},{"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 2015-05-08 17:20 UTC, Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN); resources moved: 131.153.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2015/delegated-arin-extended-20150507.gz","retrieved_at":"2026-10-12T20:52:14+00:00","summary":"ARIN delegated statistics 2015-05-07 (produced 2015-05-07T05:04:48+00:00), before the report: assigned (dated 1988-11-29)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2015/delegated-arin-extended-20150509.gz","retrieved_at":"2026-10-12T20:52:19+00:00","summary":"ARIN delegated statistics 2015-05-09 (produced 2015-05-09T05:05:37+00:00), after the report: allocated (dated 2015-05-08)"}]}],"classification_history":{"ef3f680f13cf4252":[{"raw_change_id":137377,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:31:03+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN) on 2015-05-08 17:20 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":137377,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:42+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN) on 2015-05-08 17:20 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":137377,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:19+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN) on 2015-05-08 17:20 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":137377,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:23+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Sematech, Inc. (ARIN) to SECURED SERVERS LLC (ARIN) on 2015-05-08 17:20 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 2015-05-08), allocated (dated 2017-12-20), allocated (dated 2018-01-16), allocated (dated 2018-01-18), allocated (dated 2026-01-13)"}}