{"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":"AS16937","resource_type":"asn","page":"https://rirtracker.com/asn/16937/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2018-07-30)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"b1971047c7fab67b","registry":"ARIN","report_date":"2018-07-30","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS16937","resource_type":"asn","resource":"AS16937","start":16937,"end":16937,"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":"2026-10-13T23:52:14+00:00","page":"https://rirtracker.com/asn/16937/#e-b1971047c7fab67b","report_page":"https://rirtracker.com/arin/reports/2018-07-30/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16937.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. The tracker saw this range removed from registration on 2013-12-10 (AS16937), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2018-July/003519.html","retrieved_at":"2026-10-12T18:40:07+00:00","summary":"ARIN-Issued report for 2018-07-30: \"Add AS16937\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180729.gz","retrieved_at":"2026-10-12T21:50:05+00:00","summary":"ARIN delegated statistics 2018-07-29 (produced 2018-07-29T05:00:20+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180731.gz","retrieved_at":"2026-10-12T21:50:10+00:00","summary":"ARIN delegated statistics 2018-07-31 (produced 2018-07-31T05:00:22+00:00), after the report: assigned (dated 2018-07-30)"}]},{"event_id":"98f1e4277f18c3a7","registry":"ARIN","report_date":"2018-07-30","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove AS16937","resource_type":"asn","resource":"AS16937","start":16937,"end":16937,"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":"2026-10-13T23:52:14+00:00","page":"https://rirtracker.com/asn/16937/#e-98f1e4277f18c3a7","report_page":"https://rirtracker.com/arin/reports/2018-07-30/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16937.json","explanation":"ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16937. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2018-July/003519.html","retrieved_at":"2026-10-12T18:40:07+00:00","summary":"ARIN-Issued report for 2018-07-30: \"Remove AS16937\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180729.gz","retrieved_at":"2026-10-12T21:50:05+00:00","summary":"ARIN delegated statistics 2018-07-29 (produced 2018-07-29T05:00:20+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180731.gz","retrieved_at":"2026-10-12T21:50:10+00:00","summary":"ARIN delegated statistics 2018-07-31 (produced 2018-07-31T05:00:22+00:00), after the report: assigned (dated 2018-07-30)"}]},{"event_id":"20c7cea5e151d189","registry":"ARIN","report_date":"2013-12-10","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS16937","start":16937,"end":16937,"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":"2026-10-13T23:58:42+00:00","page":"https://rirtracker.com/asn/16937/#e-20c7cea5e151d189","report_page":"https://rirtracker.com/arin/reports/2013-12-10/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/16937.json","observed":"AS16937 assigned on 2013-12-10, reserved on 2013-12-11","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":"2014-06-10","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 2000-07-05) on 2013-12-09 and reserved on 2013-12-11. 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 2014-06-10. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20131211.gz","retrieved_at":"2026-10-12T20:08:50+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS16937 assigned on 2013-12-10, reserved on 2013-12-11"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20131209.gz","retrieved_at":"2026-10-12T20:08:45+00:00","summary":"ARIN delegated statistics 2013-12-09 (produced 2013-12-09T06:06:31+00:00), before the report: assigned (dated 2000-07-05)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20131211.gz","retrieved_at":"2026-10-12T20:08:50+00:00","summary":"ARIN delegated statistics 2013-12-11 (produced 2013-12-11T06:07:34+00:00), after the report: reserved"}]}],"classification_history":{"b1971047c7fab67b":[{"raw_change_id":155702,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:41:53+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. The tracker saw this range removed from registration on 2013-12-10 (AS16937), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":155702,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:20+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. The tracker saw this range removed from registration on 2013-12-10 (AS16937), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":155702,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:02+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. The tracker saw this range removed from registration on 2013-12-10 (AS16937), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":155702,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:14+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. The tracker saw this range removed from registration on 2013-12-10 (AS16937), so it appears to have been issued again from ARIN's pool."}],"98f1e4277f18c3a7":[{"raw_change_id":155689,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:41:53+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16937. The issuance is explained on that line."},{"raw_change_id":155689,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:20+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16937. The issuance is explained on that line."},{"raw_change_id":155689,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:02+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16937. The issuance is explained on that line."},{"raw_change_id":155689,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:14+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2018-07-29 and assigned (dated 2018-07-30) on 2018-07-31. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS16937. The issuance is explained on that line."}],"20c7cea5e151d189":[{"raw_change_id":267583,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:39:36+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 2000-07-05) on 2013-12-09 and reserved on 2013-12-11. 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 2014-06-10. This does not confirm availability."},{"raw_change_id":267583,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:11:41+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 assigned (dated 2000-07-05) on 2013-12-09 and reserved on 2013-12-11. 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 2014-06-10. This does not confirm availability."},{"raw_change_id":267583,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:54:55+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 2000-07-05) on 2013-12-09 and reserved on 2013-12-11. 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 2014-06-10. This does not confirm availability."},{"raw_change_id":267583,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:42+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 2000-07-05) on 2013-12-09 and reserved on 2013-12-11. 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 2014-06-10. This does not confirm availability."}]},"arin_statistics_now":{"status":"assigned (dated 2018-07-30)"}}