{"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":"AS10121","resource_type":"asn","page":"https://rirtracker.com/asn/10121/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2016-08-26)"},"current_holder":{"rir":"APNIC","org":null,"how":"APNIC's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"4d190224ef01c6c7","registry":"APNIC","report_date":"2025-09-18","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"asn","resource":"AS10121","start":10121,"end":10121,"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":"2026-10-14T00:18:07+00:00","page":"https://rirtracker.com/asn/10121/#e-4d190224ef01c6c7","report_page":"https://rirtracker.com/apnic/reports/2025-09-18/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/10121.json","observed":"AS10121 available on 2025-09-18, allocated on 2025-09-19","explanation":"No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (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 (2025-09-17: Removed AS10121), so the before-and-after statistics may include it.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250919.gz","retrieved_at":"2026-10-13T01:46:35+00:00","summary":"Found by comparing APNIC's daily statistics: AS10121 available on 2025-09-18, allocated on 2025-09-19"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250918.gz","retrieved_at":"2026-10-13T01:46:31+00:00","summary":"APNIC delegated statistics 2025-09-18, before the change: available"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250919.gz","retrieved_at":"2026-10-13T01:46:35+00:00","summary":"APNIC delegated statistics 2025-09-19, after the change: allocated (dated 2016-08-26)"}]},{"event_id":"c8a1c5da9b5b00c3","registry":"APNIC","report_date":"2025-09-17","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"asn","resource":"AS10121","start":10121,"end":10121,"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":"2026-10-14T00:18:07+00:00","page":"https://rirtracker.com/asn/10121/#e-c8a1c5da9b5b00c3","report_page":"https://rirtracker.com/apnic/reports/2025-09-17/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/10121.json","observed":"AS10121 allocated on 2025-09-17, available on 2025-09-18","hold":{"hold_rule_source_url":"https://www.apnic.net/manage-ip/manage-resources/address-status","hold_rule_months":12,"estimated_hold_end":"2026-09-17","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 allocated (dated 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned ASNs a year after the removal or later since 2014, so the tracker estimates the hold ends on 2026-09-17. That is what APNIC has done, not a rule it states. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250918.gz","retrieved_at":"2026-10-13T01:46:31+00:00","summary":"Found by comparing APNIC's daily statistics: AS10121 allocated on 2025-09-17, available on 2025-09-18"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250917.gz","retrieved_at":"2026-10-13T01:46:28+00:00","summary":"APNIC delegated statistics 2025-09-17, before the change: allocated (dated 2016-08-26)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250918.gz","retrieved_at":"2026-10-13T01:46:31+00:00","summary":"APNIC delegated statistics 2025-09-18, after the change: available"}]},{"event_id":"11ddc694458e9476","registry":"APNIC","report_date":"2016-08-26","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"asn","resource":"AS10121","start":10121,"end":10121,"classification":"APPARENT_REISSUANCE","classification_label":"Apparent reissuance of previously removed resource","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from APNIC-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:04:19+00:00","page":"https://rirtracker.com/asn/10121/#e-11ddc694458e9476","report_page":"https://rirtracker.com/apnic/reports/2016-08-26/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/10121.json","observed":"AS10121 available on 2016-08-26, allocated on 2016-08-27","explanation":"No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), so it appears to have been issued again from APNIC's pool.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2016/delegated-apnic-extended-20160827.gz","retrieved_at":"2026-10-12T21:46:18+00:00","summary":"Found by comparing APNIC's daily statistics: AS10121 available on 2016-08-26, allocated on 2016-08-27"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2016/delegated-apnic-extended-20160826.gz","retrieved_at":"2026-10-12T21:46:14+00:00","summary":"APNIC delegated statistics 2016-08-26, before the change: available"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2016/delegated-apnic-extended-20160827.gz","retrieved_at":"2026-10-12T21:46:18+00:00","summary":"APNIC delegated statistics 2016-08-27, after the change: allocated (dated 2016-08-26)"}]},{"event_id":"44a373376d0c3563","registry":"APNIC","report_date":"2012-11-15","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"asn","resource":"AS10121","start":10121,"end":10121,"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":"2026-10-13T23:58:54+00:00","page":"https://rirtracker.com/asn/10121/#e-44a373376d0c3563","report_page":"https://rirtracker.com/apnic/reports/2012-11-15/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/10121.json","observed":"AS10121 allocated on 2012-11-15, available on 2012-11-16","explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 2007-11-22) on 2012-11-15 and available on 2012-11-16. 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/2012/delegated-apnic-extended-20121116.gz","retrieved_at":"2026-10-12T20:11:15+00:00","summary":"Found by comparing APNIC's daily statistics: AS10121 allocated on 2012-11-15, available on 2012-11-16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2012/delegated-apnic-extended-20121115.gz","retrieved_at":"2026-10-12T20:11:12+00:00","summary":"APNIC delegated statistics 2012-11-15, before the change: allocated (dated 2007-11-22)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2012/delegated-apnic-extended-20121116.gz","retrieved_at":"2026-10-12T20:11:15+00:00","summary":"APNIC delegated statistics 2012-11-16, after the change: available"}]}],"classification_history":{"4d190224ef01c6c7":[{"raw_change_id":543879,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T06:45:44+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (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 (2025-09-17: Removed AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543879,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:27:39+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (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 (2025-09-17: Removed AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543879,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:12:05+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (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 (2025-09-17: Removed AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543879,"classification_code":"RESTORED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:07+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (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 (2025-09-17: Removed AS10121), so the before-and-after statistics may include it."}],"c8a1c5da9b5b00c3":[{"raw_change_id":543865,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T06:45:44+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 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543865,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:27:39+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 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543865,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:12:05+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 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it."},{"raw_change_id":543865,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:07+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 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned ASNs a year after the removal or later since 2014, so the tracker estimates the hold ends on 2026-09-17. That is what APNIC has done, not a rule it states. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it."}],"11ddc694458e9476":[{"raw_change_id":354351,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T05:21:35+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":354351,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:16:28+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":354351,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:00:04+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":354351,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:04:19+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), so it appears to have been issued again from APNIC's pool."}],"44a373376d0c3563":[{"raw_change_id":270747,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:41:16+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 2007-11-22) on 2012-11-15 and available on 2012-11-16. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":270747,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:11:51+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 2007-11-22) on 2012-11-15 and available on 2012-11-16. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":270747,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:55:07+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 2007-11-22) on 2012-11-15 and available on 2012-11-16. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned ASNs before reissuing them, so the tracker gives no estimate. This does not confirm availability."},{"raw_change_id":270747,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:54+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 2007-11-22) on 2012-11-15 and available on 2012-11-16. 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":"not listed"}}