{"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":"AS16661","resource_type":"asn","page":"https://rirtracker.com/asn/16661/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2023-02-21)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"ae92d692b6d958e5","registry":"ARIN","report_date":"2023-02-21","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS16661","resource_type":"asn","resource":"AS16661","start":16661,"end":16661,"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":"2026-10-13T23:53:37+00:00","page":"https://rirtracker.com/asn/16661/#e-ae92d692b6d958e5","report_page":"https://rirtracker.com/arin/reports/2023-02-21/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16661.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. The tracker saw this range removed from registration on 2020-11-09 (AS16661), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2023-February/005184.html","retrieved_at":"2026-10-12T18:42:04+00:00","summary":"ARIN-Issued report for 2023-02-21: \"Add AS16661\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230220.gz","retrieved_at":"2026-10-12T23:16:10+00:00","summary":"ARIN delegated statistics 2023-02-20 (produced 2023-02-20T14:00:11+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230222.gz","retrieved_at":"2026-10-12T23:16:15+00:00","summary":"ARIN delegated statistics 2023-02-22 (produced 2023-02-22T14:00:10+00:00), after the report: assigned (dated 2023-02-21)"}]},{"event_id":"058faa5e74da6010","registry":"ARIN","report_date":"2023-02-21","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS16661","resource_type":"asn","resource":"AS16661","start":16661,"end":16661,"classification":"POOL_RECORD_CHANGE","classification_label":"Change to ARIN's own pool record","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Part of the issuance reported the same day","inventory_effect_code":"PAIRED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:37+00:00","page":"https://rirtracker.com/asn/16661/#e-058faa5e74da6010","report_page":"https://rirtracker.com/arin/reports/2023-02-21/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16661.json","explanation":"ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16661. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2023-February/005184.html","retrieved_at":"2026-10-12T18:42:04+00:00","summary":"ARIN-Issued report for 2023-02-21: \"Remove AS16661\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230220.gz","retrieved_at":"2026-10-12T23:16:10+00:00","summary":"ARIN delegated statistics 2023-02-20 (produced 2023-02-20T14:00:11+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230222.gz","retrieved_at":"2026-10-12T23:16:15+00:00","summary":"ARIN delegated statistics 2023-02-22 (produced 2023-02-22T14:00:10+00:00), after the report: assigned (dated 2023-02-21)"}]},{"event_id":"a1f9ecf744f74551","registry":"ARIN","report_date":"2020-11-09","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS16661","start":16661,"end":16661,"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":"2026-10-14T00:07:38+00:00","page":"https://rirtracker.com/asn/16661/#e-a1f9ecf744f74551","report_page":"https://rirtracker.com/arin/reports/2020-11-09/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16661.json","observed":"AS16661 assigned on 2020-11-09, reserved on 2020-11-10","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":"2021-05-09","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 assigned (dated 2012-06-14) on 2020-11-08 and reserved on 2020-11-10. 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 2021-05-09. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20201110.gz","retrieved_at":"2026-10-12T22:33:16+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS16661 assigned on 2020-11-09, reserved on 2020-11-10"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20201108.gz","retrieved_at":"2026-10-12T22:33:11+00:00","summary":"ARIN delegated statistics 2020-11-08 (produced 2020-11-08T15:00:13+00:00), before the report: assigned (dated 2012-06-14)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20201110.gz","retrieved_at":"2026-10-12T22:33:16+00:00","summary":"ARIN delegated statistics 2020-11-10 (produced 2020-11-10T15:00:13+00:00), after the report: reserved"}]},{"event_id":"a31580d30b0b586c","registry":"ARIN","report_date":"2011-12-07","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS16661","start":16661,"end":16661,"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/16661/#e-a31580d30b0b586c","report_page":"https://rirtracker.com/arin/reports/2011-12-07/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16661.json","observed":"AS16661 allocated on 2011-12-07, not listed on 2011-12-08","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":"2012-06-07","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 2000-05-15) on 2011-12-06 and not issued on 2011-12-08. (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 2012-06-07. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111208.gz","retrieved_at":"2026-10-12T19:28:42+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS16661 allocated on 2011-12-07, not listed on 2011-12-08"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111206.gz","retrieved_at":"2026-10-12T19:28:38+00:00","summary":"ARIN delegated statistics 2011-12-06, before the report: allocated (dated 2000-05-15)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111208.gz","retrieved_at":"2026-10-12T19:28:42+00:00","summary":"ARIN delegated statistics 2011-12-08, after the report: not issued"}]}],"classification_history":{"ae92d692b6d958e5":[{"raw_change_id":180273,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:58:05+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. The tracker saw this range removed from registration on 2020-11-09 (AS16661), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":180273,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:23+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. The tracker saw this range removed from registration on 2020-11-09 (AS16661), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":180273,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:13+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. The tracker saw this range removed from registration on 2020-11-09 (AS16661), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":180273,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:37+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. The tracker saw this range removed from registration on 2020-11-09 (AS16661), so it appears to have been issued again from ARIN's pool."}],"058faa5e74da6010":[{"raw_change_id":180261,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:58:05+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16661. The issuance is explained on that line."},{"raw_change_id":180261,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:23+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16661. The issuance is explained on that line."},{"raw_change_id":180261,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:13+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16661. The issuance is explained on that line."},{"raw_change_id":180261,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:37+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2023-02-20 and assigned (dated 2023-02-21) on 2023-02-22. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16661. The issuance is explained on that line."}],"a1f9ecf744f74551":[{"raw_change_id":404604,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T05:42:13+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 assigned (dated 2012-06-14) on 2020-11-08 and reserved on 2020-11-10. 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 2021-05-09. This does not confirm availability."},{"raw_change_id":404604,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:19:11+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 2012-06-14) on 2020-11-08 and reserved on 2020-11-10. 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 2021-05-09. This does not confirm availability."},{"raw_change_id":404604,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:03:00+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 2012-06-14) on 2020-11-08 and reserved on 2020-11-10. 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 2021-05-09. This does not confirm availability."},{"raw_change_id":404604,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:07:38+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 2012-06-14) on 2020-11-08 and reserved on 2020-11-10. 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 2021-05-09. This does not confirm availability."}],"a31580d30b0b586c":[{"raw_change_id":235519,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:22:37+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 2000-05-15) on 2011-12-06 and not issued on 2011-12-08. (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 2012-06-07. This does not confirm availability."},{"raw_change_id":235519,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:03+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 2000-05-15) on 2011-12-06 and not issued on 2011-12-08. (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 2012-06-07. This does not confirm availability."},{"raw_change_id":235519,"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 2000-05-15) on 2011-12-06 and not issued on 2011-12-08. (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 2012-06-07. This does not confirm availability."},{"raw_change_id":235519,"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 2000-05-15) on 2011-12-06 and not issued on 2011-12-08. (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 2012-06-07. This does not confirm availability."}]},"arin_statistics_now":{"status":"assigned (dated 2023-02-21)"}}