{"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":"204.16.56.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/204.16.56.0-204.16.59.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2017-01-26), allocated (dated 2017-02-09)"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"c0093dc38a687c4c","registry":"ARIN","report_date":"2017-01-25","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 204.16.56.0-204.16.59.255","resource_type":"ipv4","resource":"204.16.56.0/22","start":"204.16.56.0","end":"204.16.59.255","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":"2026-10-13T23:51:42+00:00","page":"https://rirtracker.com/ip/204.16.56.0-204.16.59.255/#e-c0093dc38a687c4c","report_page":"https://rirtracker.com/arin/reports/2017-01-25/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/204.16.56.0-204.16.59.255.json","explanation":"ARIN's statistics show it reserved on 2017-01-24 and available, reserved on 2017-01-26. 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 (2017-01-26: Remove 204.16.58.0-204.16.59.255; 2017-01-26: Add 204.16.58.0-204.16.59.255), so the before-and-after statistics may include it.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2017-January/002967.html","retrieved_at":"2026-10-12T18:39:29+00:00","summary":"ARIN-Issued report for 2017-01-25: \"Remove 204.16.56.0-204.16.59.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170124.gz","retrieved_at":"2026-10-12T21:22:40+00:00","summary":"ARIN delegated statistics 2017-01-24 (produced 2017-01-24T06:09:15+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170126.gz","retrieved_at":"2026-10-12T21:22:45+00:00","summary":"ARIN delegated statistics 2017-01-26 (produced 2017-01-26T06:09:58+00:00), after the report: available, reserved"}]},{"event_id":"4ea0538b5538d1d6","registry":"ARIN","report_date":"2014-11-04","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"204.16.56.0/22","start":"204.16.56.0","end":"204.16.59.255","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":"2026-10-14T00:00:11+00:00","page":"https://rirtracker.com/ip/204.16.56.0-204.16.59.255/#e-4ea0538b5538d1d6","report_page":"https://rirtracker.com/arin/reports/2014-11-04/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/204.16.56.0-204.16.59.255.json","observed":"204.16.56.0/22 allocated on 2014-11-04, reserved on 2014-11-05","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":"2015-01-03","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 2011-08-04) on 2014-11-03 and reserved on 2014-11-05. 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 2015-01-03. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2014/delegated-arin-extended-20141105.gz","retrieved_at":"2026-10-12T20:43:33+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 204.16.56.0/22 allocated on 2014-11-04, reserved on 2014-11-05"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2014/delegated-arin-extended-20141103.gz","retrieved_at":"2026-10-12T20:43:28+00:00","summary":"ARIN delegated statistics 2014-11-03 (produced 2014-11-03T06:03:55+00:00), before the report: allocated (dated 2011-08-04)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2014/delegated-arin-extended-20141105.gz","retrieved_at":"2026-10-12T20:43:33+00:00","summary":"ARIN delegated statistics 2014-11-05 (produced 2014-11-05T06:04:34+00:00), after the report: reserved"}]},{"event_id":"72137ab0330ef2d6","registry":"ARIN","report_date":"2011-08-04","source":"arin_issued","raw_action":"ADD","raw_line":"Add 204.16.56.0-204.16.59.255","resource_type":"ipv4","resource":"204.16.56.0/22","start":"204.16.56.0","end":"204.16.59.255","classification":"UNRESOLVED","classification_label":"Unresolved change","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Inventory effect unknown","inventory_effect_code":"UNKNOWN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:55+00:00","page":"https://rirtracker.com/ip/204.16.56.0-204.16.59.255/#e-72137ab0330ef2d6","report_page":"https://rirtracker.com/arin/reports/2011-08-04/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/204.16.56.0-204.16.59.255.json","explanation":"No transfer record matches. ARIN's statistics show it allocated (dated 2005-10-17) on 2011-08-03 and allocated (dated 2011-08-04) on 2011-08-05. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change).","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2011-August/000965.html","retrieved_at":"2026-10-12T18:37:12+00:00","summary":"ARIN-Issued report for 2011-08-04: \"Add 204.16.56.0-204.16.59.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110803.gz","retrieved_at":"2026-10-12T19:23:29+00:00","summary":"ARIN delegated statistics 2011-08-03, before the report: allocated (dated 2005-10-17)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110805.gz","retrieved_at":"2026-10-12T19:23:34+00:00","summary":"ARIN delegated statistics 2011-08-05, after the report: allocated (dated 2011-08-04)"}]}],"classification_history":{"c0093dc38a687c4c":[{"raw_change_id":147487,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T03:36:58+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2017-01-24 and available, reserved on 2017-01-26. 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 (2017-01-26: Remove 204.16.58.0-204.16.59.255; 2017-01-26: Add 204.16.58.0-204.16.59.255), so the before-and-after statistics may include it."},{"raw_change_id":147487,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:56+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2017-01-24 and available, reserved on 2017-01-26. 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 (2017-01-26: Remove 204.16.58.0-204.16.59.255; 2017-01-26: Add 204.16.58.0-204.16.59.255), so the before-and-after statistics may include it."},{"raw_change_id":147487,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:35+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2017-01-24 and available, reserved on 2017-01-26. 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 (2017-01-26: Remove 204.16.58.0-204.16.59.255; 2017-01-26: Add 204.16.58.0-204.16.59.255), so the before-and-after statistics may include it."},{"raw_change_id":147487,"classification_code":"POOL_RECORD_CHANGE","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:42+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2017-01-24 and available, reserved on 2017-01-26. 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 (2017-01-26: Remove 204.16.58.0-204.16.59.255; 2017-01-26: Add 204.16.58.0-204.16.59.255), so the before-and-after statistics may include it."}],"4ea0538b5538d1d6":[{"raw_change_id":291237,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:52:20+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 2011-08-04) on 2014-11-03 and reserved on 2014-11-05. 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 2015-01-03. This does not confirm availability."},{"raw_change_id":291237,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:12:57+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 2011-08-04) on 2014-11-03 and reserved on 2014-11-05. 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 2015-01-03. This does not confirm availability."},{"raw_change_id":291237,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:56:18+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 allocated (dated 2011-08-04) on 2014-11-03 and reserved on 2014-11-05. 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 2015-01-03. This does not confirm availability."},{"raw_change_id":291237,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:00:11+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 2011-08-04) on 2014-11-03 and reserved on 2014-11-05. 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 2015-01-03. This does not confirm availability."}],"72137ab0330ef2d6":[{"raw_change_id":124149,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T03:14:39+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it allocated (dated 2005-10-17) on 2011-08-03 and allocated (dated 2011-08-04) on 2011-08-05. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change)."},{"raw_change_id":124149,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:21+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it allocated (dated 2005-10-17) on 2011-08-03 and allocated (dated 2011-08-04) on 2011-08-05. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change)."},{"raw_change_id":124149,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:55+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it allocated (dated 2005-10-17) on 2011-08-03 and allocated (dated 2011-08-04) on 2011-08-05. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change)."},{"raw_change_id":124149,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:55+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it allocated (dated 2005-10-17) on 2011-08-03 and allocated (dated 2011-08-04) on 2011-08-05. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change)."}]},"arin_statistics_now":{"status":"allocated (dated 2017-01-26), allocated (dated 2017-02-09)"}}