{"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":"163.53.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/163.53.0.0-163.53.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2014-07-08), allocated (dated 2014-07-09), allocated (dated 2014-07-10), allocated (dated 2014-07-11), allocated (dated 2014-07-12), allocated (dated 2014-07-14), allocated (dated 2019-03-28), assigned (dated 2014-07-09), assigned (dated 2014-07-10), assigned (dated 2014-07-11), assigned (dated 2015-12-11), available"},"current_holder":{"rir":null,"org":null,"how":null},"rdap_snapshots":[],"transfers":[{"id":131564,"date":"2026-03-13T03:27:53Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"China Internet Network Information Center/Ebadu","recipient_org":"China Internet Network Information Center/MOERIN-CN","range":"163.53.52.0/22","log":"APNIC"},{"id":131244,"date":"2025-09-09T06:57:55Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Communications & Communicate Nepal Pvt Ltd","recipient_org":"Subisu Cablenet","range":"163.53.24.0/23","log":"APNIC"},{"id":40377,"date":"2025-05-09T11:11:25Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Alpha InfoLab Inc","recipient_org":"Ooma, Inc.","range":"163.53.212.0/22","log":"ARIN"},{"id":129676,"date":"2024-10-09T21:41:01Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"RIPE NCC","source_org":"Communications & Communicate Nepal Pvt Ltd","recipient_org":"ORG-SL1030-RIPE","range":"163.53.26.0/23","log":"APNIC"},{"id":108440,"date":"2024-10-09T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"steel-axis LLC","range":"163.53.26.0/23","log":"RIPE NCC"},{"id":127485,"date":"2021-09-07T23:43:59Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"ARIN","source_org":"Nextra Televentures Private Limited","recipient_org":"AI-1720","range":"163.53.212.0/22","log":"APNIC"},{"id":25438,"date":"2021-09-07T20:03:25Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"ARIN","source_org":"Nextra Televentures Private Limited","recipient_org":"Alpha InfoLab Inc","range":"163.53.212.0/22","log":"ARIN"},{"id":127477,"date":"2021-09-01T05:07:39Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"PROPEX DERIVATIVES PTY LTD","recipient_org":"Anticlockwise Pty Ltd","range":"163.53.68.0/22","log":"APNIC"},{"id":126918,"date":"2020-12-15T11:32:53Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"NIXI/VTIPL","recipient_org":"NIXI/GAZON","range":"163.53.200.0/22","log":"APNIC"},{"id":126299,"date":"2019-10-11T09:55:07Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"NIXI/KAY-IN","recipient_org":"NIXI/KAPPA-IN","range":"163.53.80.0/22","log":"APNIC"},{"id":125779,"date":"2018-06-01T00:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"China Internet Network Information Center/HTU-NET","recipient_org":"China Internet Network Information Center/Fastidc","range":"163.53.56.0/22","log":"APNIC"},{"id":125597,"date":"2017-11-23T00:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"China Internet Network Information Center/GSSNET","recipient_org":"China Internet Network Information Center/GSS-Networks","range":"163.53.44.0/22","log":"APNIC"},{"id":125065,"date":"2017-05-16T00:34:52Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Mega Investment & Telecom Limited","recipient_org":"NeocomISP Limited","range":"163.53.196.0/22","log":"APNIC"},{"id":124916,"date":"2017-01-18T07:40:20Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"NIXI/GTPLSHIVNETWORK","recipient_org":"NIXI/GUJARATKUTCHNETWORK","range":"163.53.208.0/22","log":"APNIC"},{"id":124910,"date":"2017-01-16T07:48:26Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"NIXI/GTPLINFONETPRIVATELIMITED","recipient_org":"NIXI/GUJARATKUTCHNETWORK","range":"163.53.176.0/22","log":"APNIC"},{"id":124564,"date":"2016-06-17T04:55:42Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Millions Dragon Technology Limited","recipient_org":"Ohana Communications Sdn Bhd","range":"163.53.224.0/22","log":"APNIC"},{"id":124156,"date":"2015-04-02T04:56:41Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"RACKCLOUD PTY. LTD.","recipient_org":"RACKHOSTING PTY LTD","range":"163.53.232.0/22","log":"APNIC"}],"events":[{"event_id":"f91bb54e672ca102","registry":"APNIC","report_date":"2011-11-14","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"163.53.0.0/16","start":"163.53.0.0","end":"163.53.255.255","classification":"REMOVED_REASON_UNKNOWN","classification_label":"Removed (return, revocation or reclamation not publicly distinguishable)","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Possible future reissue candidate after hold","inventory_effect_code":"HOLD_CANDIDATE","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:57:44+00:00","page":"https://rirtracker.com/ip/163.53.0.0-163.53.255.255/#e-f91bb54e672ca102","report_page":"https://rirtracker.com/apnic/reports/2011-11-14/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.53.0.0-163.53.255.255.json","observed":"163.53.0.0/16 allocated on 2011-11-14, reserved on 2011-11-15","explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-11-14 and reserved on 2011-11-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20111115.gz","retrieved_at":"2026-10-12T19:49:52+00:00","summary":"Found by comparing APNIC's daily statistics: 163.53.0.0/16 allocated on 2011-11-14, reserved on 2011-11-15"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20111114.gz","retrieved_at":"2026-10-12T19:49:49+00:00","summary":"APNIC delegated statistics 2011-11-14, before the change: allocated (dated 1992-07-24)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20111115.gz","retrieved_at":"2026-10-12T19:49:52+00:00","summary":"APNIC delegated statistics 2011-11-15, after the change: reserved"}]}],"classification_history":{"f91bb54e672ca102":[{"raw_change_id":251461,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:31:29+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-11-14 and reserved on 2011-11-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":251461,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:50+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-11-14 and reserved on 2011-11-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":251461,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:54:00+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-11-14 and reserved on 2011-11-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":251461,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:57:44+00:00","current":1,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-11-14 and reserved on 2011-11-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability."}]},"arin_statistics_now":{"status":"allocated (dated 2025-05-09) (only part of the range)"}}