{"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":"66.187.0.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/66.187.0.0-66.187.15.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2021-04-01), allocated (dated 2021-04-05), allocated (dated 2021-04-07), allocated (dated 2021-04-27), allocated (dated 2021-05-03), allocated (dated 2024-12-26)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[{"id":38765,"date":"2025-02-05T15:42:46Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"NullHosting LLC","recipient_org":"Bitrion LLC","range":"66.187.8.0/22","log":"ARIN"}],"events":[{"event_id":"fba9d9ddea07e37a","registry":"ARIN","report_date":"2021-03-31","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 66.187.0.0-66.187.15.255","resource_type":"ipv4","resource":"66.187.0.0/20","start":"66.187.0.0","end":"66.187.15.255","classification":"POOL_RECORD_CHANGE","classification_label":"Change to ARIN's own pool record","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:06+00:00","page":"https://rirtracker.com/ip/66.187.0.0-66.187.15.255/#e-fba9d9ddea07e37a","report_page":"https://rirtracker.com/arin/reports/2021-03-31/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/66.187.0.0-66.187.15.255.json","explanation":"ARIN's statistics show it reserved on 2021-03-30 and available, reserved on 2021-04-01. ARIN re-cut its own reserved records for this range; nothing was issued or returned. Another change to this range was reported the day before or after (2021-04-01: Add 66.187.4.0-66.187.7.255; 2021-04-01: Add 66.187.8.0-66.187.11.255; 2021-04-01: Add 66.187.12.0-66.187.13.255), so the before-and-after statistics may include it.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2021-March/004492.html","retrieved_at":"2026-10-12T18:41:15+00:00","summary":"ARIN-Issued report for 2021-03-31: \"Remove 66.187.0.0-66.187.15.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210330.gz","retrieved_at":"2026-10-12T22:40:31+00:00","summary":"ARIN delegated statistics 2021-03-30 (produced 2021-03-30T14:00:13+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210401.gz","retrieved_at":"2026-10-12T22:40:35+00:00","summary":"ARIN delegated statistics 2021-04-01 (produced 2021-04-01T14:00:13+00:00), after the report: available, reserved"}]},{"event_id":"324fdfcc7cdd0eb5","registry":"ARIN","report_date":"2020-04-07","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"66.187.0.0/20","start":"66.187.0.0","end":"66.187.15.255","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":"2026-10-14T00:06:46+00:00","page":"https://rirtracker.com/ip/66.187.0.0-66.187.15.255/#e-324fdfcc7cdd0eb5","report_page":"https://rirtracker.com/arin/reports/2020-04-07/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/66.187.0.0-66.187.15.255.json","observed":"66.187.0.0/20 allocated on 2020-04-07, reserved on 2020-04-08","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":"2020-06-06","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 2001-11-12) on 2020-04-06 and reserved on 2020-04-08. 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 2020-06-06. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200408.gz","retrieved_at":"2026-10-12T22:22:02+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 66.187.0.0/20 allocated on 2020-04-07, reserved on 2020-04-08"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200406.gz","retrieved_at":"2026-10-12T22:21:57+00:00","summary":"ARIN delegated statistics 2020-04-06 (produced 2020-04-06T14:00:13+00:00), before the report: allocated (dated 2001-11-12)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200408.gz","retrieved_at":"2026-10-12T22:22:02+00:00","summary":"ARIN delegated statistics 2020-04-08 (produced 2020-04-08T14:00:12+00:00), after the report: reserved"}]}],"classification_history":{"fba9d9ddea07e37a":[{"raw_change_id":170462,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T03:51:46+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2021-03-30 and available, reserved on 2021-04-01. ARIN re-cut its own reserved records for this range; nothing was issued or returned. Another change to this range was reported the day before or after (2021-04-01: Add 66.187.4.0-66.187.7.255; 2021-04-01: Add 66.187.8.0-66.187.11.255; 2021-04-01: Add 66.187.12.0-66.187.13.255), so the before-and-after statistics may include it."},{"raw_change_id":170462,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:00+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2021-03-30 and available, reserved on 2021-04-01. ARIN re-cut its own reserved records for this range; nothing was issued or returned. Another change to this range was reported the day before or after (2021-04-01: Add 66.187.4.0-66.187.7.255; 2021-04-01: Add 66.187.8.0-66.187.11.255; 2021-04-01: Add 66.187.12.0-66.187.13.255), so the before-and-after statistics may include it."},{"raw_change_id":170462,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:46+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2021-03-30 and available, reserved on 2021-04-01. ARIN re-cut its own reserved records for this range; nothing was issued or returned. Another change to this range was reported the day before or after (2021-04-01: Add 66.187.4.0-66.187.7.255; 2021-04-01: Add 66.187.8.0-66.187.11.255; 2021-04-01: Add 66.187.12.0-66.187.13.255), so the before-and-after statistics may include it."},{"raw_change_id":170462,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:06+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2021-03-30 and available, reserved on 2021-04-01. ARIN re-cut its own reserved records for this range; nothing was issued or returned. Another change to this range was reported the day before or after (2021-04-01: Add 66.187.4.0-66.187.7.255; 2021-04-01: Add 66.187.8.0-66.187.11.255; 2021-04-01: Add 66.187.12.0-66.187.13.255), so the before-and-after statistics may include it."}],"324fdfcc7cdd0eb5":[{"raw_change_id":392454,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T05:35:59+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 2001-11-12) on 2020-04-06 and reserved on 2020-04-08. 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 2020-06-06. This does not confirm availability."},{"raw_change_id":392454,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:18:29+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 2001-11-12) on 2020-04-06 and reserved on 2020-04-08. 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 2020-06-06. This does not confirm availability."},{"raw_change_id":392454,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:02:15+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 2001-11-12) on 2020-04-06 and reserved on 2020-04-08. 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 2020-06-06. This does not confirm availability."},{"raw_change_id":392454,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:06:46+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 2001-11-12) on 2020-04-06 and reserved on 2020-04-08. 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 2020-06-06. This does not confirm availability."}]},"arin_statistics_now":{"status":"allocated (dated 2021-04-01), allocated (dated 2021-04-05), allocated (dated 2021-04-07), allocated (dated 2021-04-27), allocated (dated 2021-05-03), allocated (dated 2024-12-26)"}}