{"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":"216.221.208.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/216.221.208.0-216.221.223.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2013-11-27)"},"current_holder":{"rir":"ARIN","org":"Intercontinental Exchange, Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":7588,"date":"2016-08-18T20:35:04Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"American Stock Exchange LLC","recipient_org":"Intercontinental Exchange, Inc.","range":"216.221.208.0/20","log":"ARIN"}],"events":[{"event_id":"5cb0ede01719df95","registry":"ARIN","report_date":"2016-08-18","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"216.221.208.0/20","start":"216.221.208.0","end":"216.221.223.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"American Stock Exchange LLC","recipient_organization":"Intercontinental Exchange, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:26+00:00","page":"https://rirtracker.com/ip/216.221.208.0-216.221.223.255/#e-5cb0ede01719df95","report_page":"https://rirtracker.com/arin/reports/2016-08-18/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/216.221.208.0-216.221.223.255.json","observed":"Merger/acquisition: American Stock Exchange LLC (ARIN) to Intercontinental Exchange, Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from American Stock Exchange LLC (ARIN) to Intercontinental Exchange, Inc. (ARIN) on 2016-08-18 20:35 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.","evidence":[{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-13T13:57:20+00:00","summary":"Transfer log: MERGER_ACQUISITION on 2016-08-18 20:35 UTC, American Stock Exchange LLC (ARIN) to Intercontinental Exchange, Inc. (ARIN); resources moved: 216.221.208.0/20"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160817.gz","retrieved_at":"2026-10-12T21:14:52+00:00","summary":"ARIN delegated statistics 2016-08-17 (produced 2016-08-17T05:09:18+00:00), before the report: assigned (dated 2013-11-27)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160819.gz","retrieved_at":"2026-10-12T21:15:04+00:00","summary":"ARIN delegated statistics 2016-08-19 (produced 2016-08-19T05:09:16+00:00), after the report: assigned (dated 2013-11-27)"}]},{"event_id":"096919555f773a55","registry":"ARIN","report_date":"2013-11-12","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 216.221.208.0-216.221.223.255","resource_type":"ipv4","resource":"216.221.208.0/20","start":"216.221.208.0","end":"216.221.223.255","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":"2026-10-13T23:51:09+00:00","page":"https://rirtracker.com/ip/216.221.208.0-216.221.223.255/#e-096919555f773a55","report_page":"https://rirtracker.com/arin/reports/2013-11-12/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/216.221.208.0-216.221.223.255.json","explanation":"ARIN's statistics show it reserved on 2013-11-11 and available on 2013-11-13. 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 2013-08-13, 91 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/2013-November/001798.html","retrieved_at":"2026-10-12T18:38:09+00:00","summary":"ARIN-Issued report for 2013-11-12: \"Remove 216.221.208.0-216.221.223.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20131111.gz","retrieved_at":"2026-10-12T20:07:24+00:00","summary":"ARIN delegated statistics 2013-11-11 (produced 2013-11-11T06:06:42+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20131113.gz","retrieved_at":"2026-10-12T20:07:29+00:00","summary":"ARIN delegated statistics 2013-11-13 (produced 2013-11-13T06:06:21+00:00), after the report: available"}]},{"event_id":"0f6105b511e64b82","registry":"ARIN","report_date":"2013-08-13","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"216.221.208.0/20","start":"216.221.208.0","end":"216.221.223.255","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":"2026-10-13T23:58:23+00:00","page":"https://rirtracker.com/ip/216.221.208.0-216.221.223.255/#e-0f6105b511e64b82","report_page":"https://rirtracker.com/arin/reports/2013-08-13/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/216.221.208.0-216.221.223.255.json","observed":"216.221.208.0/20 assigned on 2013-08-13, reserved on 2013-08-14","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_days":60,"estimated_hold_end":"2013-10-12","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 2005-08-08) on 2013-08-12 and reserved on 2013-08-14. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2013-10-12. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130814.gz","retrieved_at":"2026-10-12T20:03:11+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 216.221.208.0/20 assigned on 2013-08-13, reserved on 2013-08-14"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130812.gz","retrieved_at":"2026-10-12T20:03:06+00:00","summary":"ARIN delegated statistics 2013-08-12 (produced 2013-08-12T05:03:02+00:00), before the report: assigned (dated 2005-08-08)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130814.gz","retrieved_at":"2026-10-12T20:03:11+00:00","summary":"ARIN delegated statistics 2013-08-14 (produced 2013-08-14T05:05:31+00:00), after the report: reserved"}]}],"classification_history":{"5cb0ede01719df95":[{"raw_change_id":550602,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:26+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from American Stock Exchange LLC (ARIN) to Intercontinental Exchange, Inc. (ARIN) on 2016-08-18 20:35 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it."}],"096919555f773a55":[{"raw_change_id":130695,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:22:42+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2013-11-11 and available on 2013-11-13. 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 2013-08-13, 91 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":130695,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:31+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2013-11-11 and available on 2013-11-13. 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 2013-08-13, 91 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":130695,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:07+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2013-11-11 and available on 2013-11-13. 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 2013-08-13, 91 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":130695,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:09+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2013-11-11 and available on 2013-11-13. 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 2013-08-13, 91 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed."}],"0f6105b511e64b82":[{"raw_change_id":262290,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:37:07+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 2005-08-08) on 2013-08-12 and reserved on 2013-08-14. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2013-10-12. This does not confirm availability."},{"raw_change_id":262290,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:11:24+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 2005-08-08) on 2013-08-12 and reserved on 2013-08-14. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2013-10-12. This does not confirm availability."},{"raw_change_id":262290,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:54:36+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 2005-08-08) on 2013-08-12 and reserved on 2013-08-14. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2013-10-12. This does not confirm availability."},{"raw_change_id":262290,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:23+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 2005-08-08) on 2013-08-12 and reserved on 2013-08-14. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2013-10-12. This does not confirm availability."}]},"arin_statistics_now":{"status":"allocated (dated 2013-11-27)"}}