{"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":"155.146.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/155.146.0.0-155.146.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2020-05-04)"},"current_holder":{"rir":"ARIN","org":"Amazon Technologies Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":20604,"date":"2020-05-04T19:00:51Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Center for Machine Intelligence","recipient_org":"Amazon Technologies Inc.","range":"155.146.0.0/16","log":"ARIN"}],"events":[{"event_id":"097bfbd63f4db82f","registry":"ARIN","report_date":"2020-05-04","source":"arin_issued","raw_action":"ADD","raw_line":"Add 155.146.0.0-155.146.255.255","resource_type":"ipv4","resource":"155.146.0.0/16","start":"155.146.0.0","end":"155.146.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Center for Machine Intelligence","recipient_organization":"Amazon Technologies Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:49+00:00","page":"https://rirtracker.com/ip/155.146.0.0-155.146.255.255/#e-097bfbd63f4db82f","report_page":"https://rirtracker.com/arin/reports/2020-05-04/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/155.146.0.0-155.146.255.255.json","explanation":"ARIN's transfer log records a transfer from Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN) on 2020-05-04 19:00 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/2020-May/004161.html","retrieved_at":"2026-10-12T18:40:54+00:00","summary":"ARIN-Issued report for 2020-05-04: \"Add 155.146.0.0-155.146.255.255\""},{"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 2020-05-04 19:00 UTC, Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN); resources moved: 155.146.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200503.gz","retrieved_at":"2026-10-12T22:23:22+00:00","summary":"ARIN delegated statistics 2020-05-03 (produced 2020-05-03T14:00:13+00:00), before the report: assigned (dated 1991-11-25)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200505.gz","retrieved_at":"2026-10-12T22:23:28+00:00","summary":"ARIN delegated statistics 2020-05-05 (produced 2020-05-05T14:00:13+00:00), after the report: allocated (dated 2020-05-04)"}]}],"classification_history":{"097bfbd63f4db82f":[{"raw_change_id":165283,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:48:04+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN) on 2020-05-04 19:00 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":165283,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:47+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN) on 2020-05-04 19:00 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":165283,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:32+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN) on 2020-05-04 19:00 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":165283,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:49+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Center for Machine Intelligence (ARIN) to Amazon Technologies Inc. (ARIN) on 2020-05-04 19:00 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 2020-05-04)"}}