{"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":"AS11531","resource_type":"asn","page":"https://rirtracker.com/asn/11531/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2025-10-15)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"d222ce0eb5ad43fc","registry":"ARIN","report_date":"2025-10-15","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS11531","resource_type":"asn","resource":"AS11531","start":11531,"end":11531,"classification":"APPARENT_REISSUANCE","classification_label":"Apparent reissuance of previously removed resource","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:38+00:00","page":"https://rirtracker.com/asn/11531/#e-d222ce0eb5ad43fc","report_page":"https://rirtracker.com/arin/reports/2025-10-15/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/11531.json","explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-14 and assigned (dated 2025-10-15) on 2025-10-16. The tracker saw this range released from hold on 2025-10-14 (AS11531), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-14: Remove AS11531), so the before-and-after statistics may include it.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2025-October/006150.html","retrieved_at":"2026-10-12T18:43:11+00:00","summary":"ARIN-Issued report for 2025-10-15: \"Add AS11531\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251014.gz","retrieved_at":"2026-10-13T00:08:25+00:00","summary":"ARIN delegated statistics 2025-10-14 (produced 2025-10-14T13:00:47+00:00), before the report: available"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251016.gz","retrieved_at":"2026-10-13T00:08:30+00:00","summary":"ARIN delegated statistics 2025-10-16 (produced 2025-10-16T13:00:46+00:00), after the report: assigned (dated 2025-10-15)"}]},{"event_id":"298953b8bd7a8e4a","registry":"ARIN","report_date":"2025-10-14","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS11531","resource_type":"asn","resource":"AS11531","start":11531,"end":11531,"classification":"HOLD_RELEASED","classification_label":"Released from hold (ARIN lists it as 'available')","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"ARIN's statistics now list it as 'available'; reissue not confirmed","inventory_effect_code":"RELEASED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:37+00:00","page":"https://rirtracker.com/asn/11531/#e-298953b8bd7a8e4a","report_page":"https://rirtracker.com/arin/reports/2025-10-14/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/11531.json","explanation":"ARIN's statistics show it reserved on 2025-10-13 and available on 2025-10-15. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2009-01-26, 6105 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2025-10-15: Add AS11531), so the before-and-after statistics may include it.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2025-October/006149.html","retrieved_at":"2026-10-12T18:43:11+00:00","summary":"ARIN-Issued report for 2025-10-14: \"Remove AS11531\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251013.gz","retrieved_at":"2026-10-13T00:08:23+00:00","summary":"ARIN delegated statistics 2025-10-13 (produced 2025-10-13T13:00:46+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251015.gz","retrieved_at":"2026-10-13T00:08:28+00:00","summary":"ARIN delegated statistics 2025-10-15 (produced 2025-10-15T13:00:47+00:00), after the report: available"}]},{"event_id":"df082d5f70fba1f2","registry":"ARIN","report_date":"2009-01-26","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS11531","start":11531,"end":11531,"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":"2026-10-13T23:54:49+00:00","page":"https://rirtracker.com/asn/11531/#e-df082d5f70fba1f2","report_page":"https://rirtracker.com/arin/reports/2009-01-26/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/11531.json","observed":"AS11531 allocated on 2009-01-26, not listed on 2009-01-27","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_months":6,"estimated_hold_end":"2009-07-26","availability_statement":"Possible reissue candidate after this date; not confirmed available"},"explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 1998-09-23) on 2009-01-25 and not issued on 2009-01-27. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2009-07-26. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090127.gz","retrieved_at":"2026-10-12T18:45:47+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS11531 allocated on 2009-01-26, not listed on 2009-01-27"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090125.gz","retrieved_at":"2026-10-12T18:45:43+00:00","summary":"ARIN delegated statistics 2009-01-25, before the report: allocated (dated 1998-09-23)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090127.gz","retrieved_at":"2026-10-12T18:45:47+00:00","summary":"ARIN delegated statistics 2009-01-27, after the report: not issued"}]}],"classification_history":{"d222ce0eb5ad43fc":[{"raw_change_id":197176,"classification_code":"APPARENT_REISSUANCE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:08:28+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-14 and assigned (dated 2025-10-15) on 2025-10-16. The tracker saw this range released from hold on 2025-10-14 (AS11531), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-14: Remove AS11531), so the before-and-after statistics may include it."},{"raw_change_id":197176,"classification_code":"APPARENT_REISSUANCE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:08+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-14 and assigned (dated 2025-10-15) on 2025-10-16. The tracker saw this range released from hold on 2025-10-14 (AS11531), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-14: Remove AS11531), so the before-and-after statistics may include it."},{"raw_change_id":197176,"classification_code":"APPARENT_REISSUANCE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:03+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-14 and assigned (dated 2025-10-15) on 2025-10-16. The tracker saw this range released from hold on 2025-10-14 (AS11531), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-14: Remove AS11531), so the before-and-after statistics may include it."},{"raw_change_id":197176,"classification_code":"APPARENT_REISSUANCE","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:38+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-14 and assigned (dated 2025-10-15) on 2025-10-16. The tracker saw this range released from hold on 2025-10-14 (AS11531), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-14: Remove AS11531), so the before-and-after statistics may include it."}],"298953b8bd7a8e4a":[{"raw_change_id":196991,"classification_code":"HOLD_RELEASED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:08:24+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-10-13 and available on 2025-10-15. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2009-01-26, 6105 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2025-10-15: Add AS11531), so the before-and-after statistics may include it."},{"raw_change_id":196991,"classification_code":"HOLD_RELEASED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:07+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-10-13 and available on 2025-10-15. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2009-01-26, 6105 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2025-10-15: Add AS11531), so the before-and-after statistics may include it."},{"raw_change_id":196991,"classification_code":"HOLD_RELEASED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:02+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-10-13 and available on 2025-10-15. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2009-01-26, 6105 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2025-10-15: Add AS11531), so the before-and-after statistics may include it."},{"raw_change_id":196991,"classification_code":"HOLD_RELEASED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:37+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2025-10-13 and available on 2025-10-15. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2009-01-26, 6105 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2025-10-15: Add AS11531), so the before-and-after statistics may include it."}],"df082d5f70fba1f2":[{"raw_change_id":200413,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:09:41+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 1998-09-23) on 2009-01-25 and not issued on 2009-01-27. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2009-07-26. This does not confirm availability."},{"raw_change_id":200413,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:18+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 1998-09-23) on 2009-01-25 and not issued on 2009-01-27. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2009-07-26. This does not confirm availability."},{"raw_change_id":200413,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:13+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 1998-09-23) on 2009-01-25 and not issued on 2009-01-27. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2009-07-26. This does not confirm availability."},{"raw_change_id":200413,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:49+00:00","current":1,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 1998-09-23) on 2009-01-25 and not issued on 2009-01-27. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2009-07-26. This does not confirm availability."}]},"arin_statistics_now":{"status":"assigned (dated 2025-10-15)"}}