{"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":"AS21906","resource_type":"asn","page":"https://rirtracker.com/asn/21906/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2025-10-27)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"508a3f0f98082eec","registry":"ARIN","report_date":"2025-10-27","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS21906","resource_type":"asn","resource":"AS21906","start":21906,"end":21906,"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 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/21906/#e-508a3f0f98082eec","report_page":"https://rirtracker.com/arin/reports/2025-10-27/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/21906.json","explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-26 and assigned (dated 2025-10-27) on 2025-10-28. The tracker saw this range released from hold on 2025-10-14 (AS21906), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2025-October/006162.html","retrieved_at":"2026-10-12T18:43:11+00:00","summary":"ARIN-Issued report for 2025-10-27: \"Add AS21906\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251026.gz","retrieved_at":"2026-10-13T00:09:09+00:00","summary":"ARIN delegated statistics 2025-10-26 (produced 2025-10-26T13:00:47+00:00), before the report: available"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20251028.gz","retrieved_at":"2026-10-13T00:09:14+00:00","summary":"ARIN delegated statistics 2025-10-28 (produced 2025-10-28T13:00:47+00:00), after the report: assigned (dated 2025-10-27)"}]},{"event_id":"ad8f5033aacfb844","registry":"ARIN","report_date":"2025-10-14","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS21906","resource_type":"asn","resource":"AS21906","start":21906,"end":21906,"classification":"HOLD_RELEASED","classification_label":"Released from hold (ARIN lists it as 'available')","confidence":"STRONG_INFERENCE","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/21906/#e-ad8f5033aacfb844","report_page":"https://rirtracker.com/arin/reports/2025-10-14/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/21906.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 2025-09-29, 15 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed.","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 AS21906\""},{"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":"8312fe8efc40175d","registry":"ARIN","report_date":"2025-09-29","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS21906","start":21906,"end":21906,"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":"2026-10-14T00:13:41+00:00","page":"https://rirtracker.com/asn/21906/#e-8312fe8efc40175d","report_page":"https://rirtracker.com/arin/reports/2025-09-29/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/21906.json","observed":"AS21906 assigned on 2025-09-29, reserved on 2025-09-30","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":"2026-03-29","availability_statement":"Possible reissue candidate after this date; not confirmed available","released_sooner_since":"2024-07-01"},"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 assigned (dated 2012-07-18) on 2025-09-28 and reserved on 2025-09-30. 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 2026-03-29. This does not confirm availability. Since mid-2024, ARIN has released many ASNs within two months, before the 6 calendar months were up, so the release can come sooner.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250930.gz","retrieved_at":"2026-10-13T00:07:37+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS21906 assigned on 2025-09-29, reserved on 2025-09-30"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250928.gz","retrieved_at":"2026-10-13T00:07:31+00:00","summary":"ARIN delegated statistics 2025-09-28 (produced 2025-09-28T13:00:50+00:00), before the report: assigned (dated 2012-07-18)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250930.gz","retrieved_at":"2026-10-13T00:07:37+00:00","summary":"ARIN delegated statistics 2025-09-30 (produced 2025-09-30T13:00:49+00:00), after the report: reserved"}]},{"event_id":"cffee2eeb7667c1e","registry":"ARIN","report_date":"2011-12-13","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS21906","start":21906,"end":21906,"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":"2026-10-13T23:56:51+00:00","page":"https://rirtracker.com/asn/21906/#e-cffee2eeb7667c1e","report_page":"https://rirtracker.com/arin/reports/2011-12-13/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/21906.json","observed":"AS21906 allocated on 2011-12-13, not listed on 2011-12-14","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":"2012-06-13","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 2001-07-10) on 2011-12-12 and not issued on 2011-12-14. (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 2012-06-13. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111214.gz","retrieved_at":"2026-10-12T19:28:56+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS21906 allocated on 2011-12-13, not listed on 2011-12-14"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111212.gz","retrieved_at":"2026-10-12T19:28:52+00:00","summary":"ARIN delegated statistics 2011-12-12, before the report: allocated (dated 2001-07-10)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111214.gz","retrieved_at":"2026-10-12T19:28:56+00:00","summary":"ARIN delegated statistics 2011-12-14, after the report: not issued"}]}],"classification_history":{"508a3f0f98082eec":[{"raw_change_id":197354,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:08:32+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-26 and assigned (dated 2025-10-27) on 2025-10-28. The tracker saw this range released from hold on 2025-10-14 (AS21906), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":197354,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:09+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-26 and assigned (dated 2025-10-27) on 2025-10-28. The tracker saw this range released from hold on 2025-10-14 (AS21906), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":197354,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:04+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2025-10-26 and assigned (dated 2025-10-27) on 2025-10-28. The tracker saw this range released from hold on 2025-10-14 (AS21906), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":197354,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","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 2025-10-26 and assigned (dated 2025-10-27) on 2025-10-28. The tracker saw this range released from hold on 2025-10-14 (AS21906), so it appears to have been issued again from ARIN's pool."}],"ad8f5033aacfb844":[{"raw_change_id":197030,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:08:25+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 2025-09-29, 15 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":197030,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:08+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 2025-09-29, 15 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":197030,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:03+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 2025-09-29, 15 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":197030,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","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 2025-09-29, 15 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."}],"8312fe8efc40175d":[{"raw_change_id":486285,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:18:18+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 assigned (dated 2012-07-18) on 2025-09-28 and reserved on 2025-09-30. 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 2026-03-29. This does not confirm availability."},{"raw_change_id":486285,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:24:04+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 assigned (dated 2012-07-18) on 2025-09-28 and reserved on 2025-09-30. 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 2026-03-29. This does not confirm availability."},{"raw_change_id":486285,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:08:14+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 assigned (dated 2012-07-18) on 2025-09-28 and reserved on 2025-09-30. 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 2026-03-29. This does not confirm availability."},{"raw_change_id":486285,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:13:41+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 assigned (dated 2012-07-18) on 2025-09-28 and reserved on 2025-09-30. 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 2026-03-29. This does not confirm availability. Since mid-2024, ARIN has released many ASNs within two months, before the 6 calendar months were up, so the release can come sooner."}],"cffee2eeb7667c1e":[{"raw_change_id":235614,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:22:38+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 2001-07-10) on 2011-12-12 and not issued on 2011-12-14. (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 2012-06-13. This does not confirm availability."},{"raw_change_id":235614,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:04+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 2001-07-10) on 2011-12-12 and not issued on 2011-12-14. (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 2012-06-13. This does not confirm availability."},{"raw_change_id":235614,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:09+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 2001-07-10) on 2011-12-12 and not issued on 2011-12-14. (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 2012-06-13. This does not confirm availability."},{"raw_change_id":235614,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:51+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 2001-07-10) on 2011-12-12 and not issued on 2011-12-14. (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 2012-06-13. This does not confirm availability."}]},"arin_statistics_now":{"status":"assigned (dated 2025-10-27)"}}