{"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":"203.133.252.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/203.133.252.0-203.133.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 1996-04-25)"},"current_holder":{"rir":"APNIC","org":null,"how":"APNIC's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"8d14a41985431618","registry":"APNIC","report_date":"2023-08-29","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"203.133.252.0/22","start":"203.133.252.0","end":"203.133.255.255","classification":"UNRESOLVED","classification_label":"Unresolved change","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Inventory effect unknown","inventory_effect_code":"UNKNOWN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:15:47+00:00","page":"https://rirtracker.com/ip/203.133.252.0-203.133.255.255/#e-8d14a41985431618","report_page":"https://rirtracker.com/apnic/reports/2023-08-29/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/203.133.252.0-203.133.255.255.json","observed":"203.133.252.0/22 reserved on 2023-08-29, allocated on 2023-08-30","explanation":"No transfer record matches. APNIC's statistics show it reserved on 2023-08-29 and allocated (dated 1996-04-25) on 2023-08-30. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230830.gz","retrieved_at":"2026-10-13T00:48:30+00:00","summary":"Found by comparing APNIC's daily statistics: 203.133.252.0/22 reserved on 2023-08-29, allocated on 2023-08-30"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230829.gz","retrieved_at":"2026-10-13T00:47:49+00:00","summary":"APNIC delegated statistics 2023-08-29, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230830.gz","retrieved_at":"2026-10-13T00:48:30+00:00","summary":"APNIC delegated statistics 2023-08-30, after the change: allocated (dated 1996-04-25)"}]},{"event_id":"02da51ac97fe19cc","registry":"APNIC","report_date":"2023-08-21","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"203.133.252.0/22","start":"203.133.252.0","end":"203.133.255.255","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":"2026-10-14T00:15:43+00:00","page":"https://rirtracker.com/ip/203.133.252.0-203.133.255.255/#e-02da51ac97fe19cc","report_page":"https://rirtracker.com/apnic/reports/2023-08-21/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/203.133.252.0-203.133.255.255.json","observed":"203.133.252.0/22 assigned on 2023-08-21, reserved on 2023-08-22","hold":{"hold_rule_source_url":"https://www.apnic.net/manage-ip/manage-resources/address-status","hold_rule_months":12,"estimated_hold_end":"2024-08-21","availability_statement":"Possible reissue candidate after this date; not confirmed available","hold_rule_observed":true},"explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it assigned (dated 1996-04-25) on 2023-08-21 and reserved on 2023-08-22. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned IPv4 space a year after the removal or later since 2014, so the tracker estimates the hold ends on 2024-08-21. That is what APNIC has done, not a rule it states. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230822.gz","retrieved_at":"2026-10-13T00:47:24+00:00","summary":"Found by comparing APNIC's daily statistics: 203.133.252.0/22 assigned on 2023-08-21, reserved on 2023-08-22"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230821.gz","retrieved_at":"2026-10-13T00:47:20+00:00","summary":"APNIC delegated statistics 2023-08-21, before the change: assigned (dated 1996-04-25)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230822.gz","retrieved_at":"2026-10-13T00:47:24+00:00","summary":"APNIC delegated statistics 2023-08-22, after the change: reserved"}]},{"event_id":"ed26d38dc911b010","registry":"APNIC","report_date":"2011-06-02","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"203.133.252.0/22","start":"203.133.252.0","end":"203.133.255.255","classification":"RESTORED","classification_label":"Restored to the same holder","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:57:21+00:00","page":"https://rirtracker.com/ip/203.133.252.0-203.133.255.255/#e-ed26d38dc911b010","report_page":"https://rirtracker.com/apnic/reports/2011-06-02/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/203.133.252.0-203.133.255.255.json","observed":"203.133.252.0/22 reserved on 2011-06-02, assigned on 2011-06-03","explanation":"No transfer record matches. APNIC's statistics show it reserved on 2011-06-02 and assigned (dated 2011-06-02) on 2011-06-03. The tracker saw it removed from registration on 2011-06-01 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2011-06-01: Removed 203.133.252.0/22), so the before-and-after statistics may include it.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110603.gz","retrieved_at":"2026-10-12T19:40:37+00:00","summary":"Found by comparing APNIC's daily statistics: 203.133.252.0/22 reserved on 2011-06-02, assigned on 2011-06-03"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110602.gz","retrieved_at":"2026-10-12T19:40:34+00:00","summary":"APNIC delegated statistics 2011-06-02, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110603.gz","retrieved_at":"2026-10-12T19:40:37+00:00","summary":"APNIC delegated statistics 2011-06-03, after the change: assigned (dated 2011-06-02)"}]},{"event_id":"e19fac02891bc65d","registry":"APNIC","report_date":"2011-06-01","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"203.133.252.0/22","start":"203.133.252.0","end":"203.133.255.255","classification":"REMOVED_REASON_UNKNOWN","classification_label":"Removed (return, revocation or reclamation not publicly distinguishable)","confidence":"OBSERVED_ONLY","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":"2026-10-13T23:57:21+00:00","page":"https://rirtracker.com/ip/203.133.252.0-203.133.255.255/#e-e19fac02891bc65d","report_page":"https://rirtracker.com/apnic/reports/2011-06-01/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/203.133.252.0-203.133.255.255.json","observed":"203.133.252.0/22 assigned on 2011-06-01, reserved on 2011-06-02","explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it assigned (dated 1996-04-25) on 2011-06-01 and reserved on 2011-06-02. 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. Another change to this range was reported the day before or after (2011-06-02: Added 203.133.252.0/22), so the before-and-after statistics may include it.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110602.gz","retrieved_at":"2026-10-12T19:40:34+00:00","summary":"Found by comparing APNIC's daily statistics: 203.133.252.0/22 assigned on 2011-06-01, reserved on 2011-06-02"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110601.gz","retrieved_at":"2026-10-12T19:40:31+00:00","summary":"APNIC delegated statistics 2011-06-01, before the change: assigned (dated 1996-04-25)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110602.gz","retrieved_at":"2026-10-12T19:40:34+00:00","summary":"APNIC delegated statistics 2011-06-02, after the change: reserved"}]}],"classification_history":{"8d14a41985431618":[{"raw_change_id":514589,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T06:32:06+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2023-08-29 and allocated (dated 1996-04-25) on 2023-08-30. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":514589,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:25:49+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2023-08-29 and allocated (dated 1996-04-25) on 2023-08-30. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":514589,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:10:07+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2023-08-29 and allocated (dated 1996-04-25) on 2023-08-30. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":514589,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:15:47+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2023-08-29 and allocated (dated 1996-04-25) on 2023-08-30. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."}],"02da51ac97fe19cc":[{"raw_change_id":513933,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:31:49+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 assigned (dated 1996-04-25) on 2023-08-21 and reserved on 2023-08-22. 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":513933,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:25:46+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 assigned (dated 1996-04-25) on 2023-08-21 and reserved on 2023-08-22. 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":513933,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:10:04+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 assigned (dated 1996-04-25) on 2023-08-21 and reserved on 2023-08-22. 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":513933,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:15:43+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 assigned (dated 1996-04-25) on 2023-08-21 and reserved on 2023-08-22. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned IPv4 space a year after the removal or later since 2014, so the tracker estimates the hold ends on 2024-08-21. That is what APNIC has done, not a rule it states. This does not confirm availability."}],"ed26d38dc911b010":[{"raw_change_id":245295,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:28:51+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2011-06-02 and assigned (dated 2011-06-02) on 2011-06-03. The tracker saw it removed from registration on 2011-06-01 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2011-06-01: Removed 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245295,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:29+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2011-06-02 and assigned (dated 2011-06-02) on 2011-06-03. The tracker saw it removed from registration on 2011-06-01 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2011-06-01: Removed 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245295,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:37+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2011-06-02 and assigned (dated 2011-06-02) on 2011-06-03. The tracker saw it removed from registration on 2011-06-01 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2011-06-01: Removed 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245295,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:57:21+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2011-06-02 and assigned (dated 2011-06-02) on 2011-06-03. The tracker saw it removed from registration on 2011-06-01 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2011-06-01: Removed 203.133.252.0/22), so the before-and-after statistics may include it."}],"e19fac02891bc65d":[{"raw_change_id":245267,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:28:50+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 assigned (dated 1996-04-25) on 2011-06-01 and reserved on 2011-06-02. 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. Another change to this range was reported the day before or after (2011-06-02: Added 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245267,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:29+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 assigned (dated 1996-04-25) on 2011-06-01 and reserved on 2011-06-02. 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. Another change to this range was reported the day before or after (2011-06-02: Added 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245267,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:37+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 assigned (dated 1996-04-25) on 2011-06-01 and reserved on 2011-06-02. 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. Another change to this range was reported the day before or after (2011-06-02: Added 203.133.252.0/22), so the before-and-after statistics may include it."},{"raw_change_id":245267,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:57:21+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 assigned (dated 1996-04-25) on 2011-06-01 and reserved on 2011-06-02. 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. Another change to this range was reported the day before or after (2011-06-02: Added 203.133.252.0/22), so the before-and-after statistics may include it."}]},"arin_statistics_now":{"status":"not listed"}}