{"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":"192.51.172.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/192.51.172.0-192.51.175.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2025-07-24), assigned (dated 2025-07-24)"},"current_holder":{"rir":"APNIC","org":null,"how":"APNIC's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"760451f4f2e21a3f","registry":"APNIC","report_date":"2020-08-03","source":"statistics","raw_action":"RELEASED","raw_line":null,"resource_type":"ipv4","resource":"192.51.172.0/22","start":"192.51.172.0","end":"192.51.175.255","classification":"HOLD_RELEASED","classification_label":"Released from hold (APNIC lists it as 'available')","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"APNIC's statistics now list it as 'available'; reissue not confirmed","inventory_effect_code":"RELEASED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:10:57+00:00","page":"https://rirtracker.com/ip/192.51.172.0-192.51.175.255/#e-760451f4f2e21a3f","report_page":"https://rirtracker.com/apnic/reports/2020-08-03/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/192.51.172.0-192.51.175.255.json","observed":"192.51.172.0/22 reserved on 2020-08-03, available on 2020-08-04","explanation":"APNIC's statistics show it reserved on 2020-08-03 and available on 2020-08-04. APNIC moved it from its reserved (held) records to the status it calls 'available'. That is APNIC's own label: whether and when it is reissued is not confirmed.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2020/delegated-apnic-extended-20200804.gz","retrieved_at":"2026-10-12T23:24:43+00:00","summary":"Found by comparing APNIC's daily statistics: 192.51.172.0/22 reserved on 2020-08-03, available on 2020-08-04"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2020/delegated-apnic-extended-20200803.gz","retrieved_at":"2026-10-12T23:24:40+00:00","summary":"APNIC delegated statistics 2020-08-03, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2020/delegated-apnic-extended-20200804.gz","retrieved_at":"2026-10-12T23:24:43+00:00","summary":"APNIC delegated statistics 2020-08-04, after the change: available"}]}],"classification_history":{"760451f4f2e21a3f":[{"raw_change_id":452072,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:02:07+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2020-08-03 and available on 2020-08-04. APNIC moved it from its reserved (held) records to the status it calls 'available'. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":452072,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:21:56+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2020-08-03 and available on 2020-08-04. APNIC moved it from its reserved (held) records to the status it calls 'available'. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":452072,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:05:57+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2020-08-03 and available on 2020-08-04. APNIC moved it from its reserved (held) records to the status it calls 'available'. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":452072,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:10:57+00:00","current":1,"public_explanation":"APNIC's statistics show it reserved on 2020-08-03 and available on 2020-08-04. APNIC moved it from its reserved (held) records to the status it calls 'available'. That is APNIC's own label: whether and when it is reissued is not confirmed."}]},"arin_statistics_now":{"status":"not listed"}}