{"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":"57.147.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/57.147.0.0-57.147.255.255/","statistics_now":{"registry":"RIPE NCC","status":"assigned (dated 1993-06-21)"},"current_holder":{"rir":"RIPE NCC","org":null,"how":"The RIPE NCC's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"991bf9187058d711","registry":"APNIC","report_date":"2018-01-04","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"57.147.0.0/16","start":"57.147.0.0","end":"57.147.255.255","classification":"REMOVED_REASON_UNKNOWN","classification_label":"Removed (return, revocation or reclamation not publicly distinguishable)","confidence":"OBSERVED_ONLY","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":"2026-10-14T00:06:35+00:00","page":"https://rirtracker.com/ip/57.147.0.0-57.147.255.255/#e-991bf9187058d711","report_page":"https://rirtracker.com/apnic/reports/2018-01-04/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/57.147.0.0-57.147.255.255.json","observed":"57.147.0.0/16 allocated on 2018-01-04, reserved on 2018-01-05","hold":{"hold_rule_source_url":"https://www.apnic.net/manage-ip/manage-resources/address-status","hold_rule_months":12,"estimated_hold_end":"2019-01-04","availability_statement":"Possible reissue candidate after this date; not confirmed available","hold_rule_observed":true},"explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-01-10) on 2018-01-04 and reserved on 2018-01-05. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned IPv4 space a year after the removal or later since 2014, so the tracker estimates the hold ends on 2019-01-04. That is what APNIC has done, not a rule it states. This does not confirm availability. Another change to this range was reported the day before or after (2018-01-03: Added 57.147.0.0/16), so the before-and-after statistics may include it.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180105.gz","retrieved_at":"2026-10-12T22:19:31+00:00","summary":"Found by comparing APNIC's daily statistics: 57.147.0.0/16 allocated on 2018-01-04, reserved on 2018-01-05"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180104.gz","retrieved_at":"2026-10-12T22:19:28+00:00","summary":"APNIC delegated statistics 2018-01-04, before the change: allocated (dated 1992-01-10)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180105.gz","retrieved_at":"2026-10-12T22:19:31+00:00","summary":"APNIC delegated statistics 2018-01-05, after the change: reserved"}]},{"event_id":"fbcae6e38376dee2","registry":"APNIC","report_date":"2018-01-03","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"57.147.0.0/16","start":"57.147.0.0","end":"57.147.255.255","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":"2026-10-14T00:06:35+00:00","page":"https://rirtracker.com/ip/57.147.0.0-57.147.255.255/#e-fbcae6e38376dee2","report_page":"https://rirtracker.com/apnic/reports/2018-01-03/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/57.147.0.0-57.147.255.255.json","observed":"57.147.0.0/16 not listed on 2018-01-03, allocated on 2018-01-04","explanation":"No transfer record matches. APNIC's statistics show it not listed on 2018-01-03 and allocated (dated 1992-01-10) on 2018-01-04. It wasn't in APNIC's statistics before, so it wasn't APNIC's unissued inventory; it may have come from another registry in a transfer not yet in the log.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180104.gz","retrieved_at":"2026-10-12T22:19:28+00:00","summary":"Found by comparing APNIC's daily statistics: 57.147.0.0/16 not listed on 2018-01-03, allocated on 2018-01-04"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180103.gz","retrieved_at":"2026-10-12T22:19:24+00:00","summary":"APNIC delegated statistics 2018-01-03, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180104.gz","retrieved_at":"2026-10-12T22:19:28+00:00","summary":"APNIC delegated statistics 2018-01-04, after the change: allocated (dated 1992-01-10)"}]}],"classification_history":{"991bf9187058d711":[{"raw_change_id":389826,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T05:34:52+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-01-10) on 2018-01-04 and reserved on 2018-01-05. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2018-01-03: Added 57.147.0.0/16), so the before-and-after statistics may include it."},{"raw_change_id":389826,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:18:20+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-01-10) on 2018-01-04 and reserved on 2018-01-05. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2018-01-03: Added 57.147.0.0/16), so the before-and-after statistics may include it."},{"raw_change_id":389826,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:02:06+00:00","current":0,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-01-10) on 2018-01-04 and reserved on 2018-01-05. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no fixed period for which it holds returned IPv4 space before reissuing it, so the tracker gives no estimate. This does not confirm availability. Another change to this range was reported the day before or after (2018-01-03: Added 57.147.0.0/16), so the before-and-after statistics may include it."},{"raw_change_id":389826,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:06:35+00:00","current":1,"public_explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-01-10) on 2018-01-04 and reserved on 2018-01-05. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned IPv4 space a year after the removal or later since 2014, so the tracker estimates the hold ends on 2019-01-04. That is what APNIC has done, not a rule it states. This does not confirm availability. Another change to this range was reported the day before or after (2018-01-03: Added 57.147.0.0/16), so the before-and-after statistics may include it."}],"fbcae6e38376dee2":[{"raw_change_id":389818,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T05:34:52+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2018-01-03 and allocated (dated 1992-01-10) on 2018-01-04. It wasn't in APNIC's statistics before, so it wasn't APNIC's unissued inventory; it may have come from another registry in a transfer not yet in the log."},{"raw_change_id":389818,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:18:20+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2018-01-03 and allocated (dated 1992-01-10) on 2018-01-04. It wasn't in APNIC's statistics before, so it wasn't APNIC's unissued inventory; it may have come from another registry in a transfer not yet in the log."},{"raw_change_id":389818,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:02:06+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2018-01-03 and allocated (dated 1992-01-10) on 2018-01-04. It wasn't in APNIC's statistics before, so it wasn't APNIC's unissued inventory; it may have come from another registry in a transfer not yet in the log."},{"raw_change_id":389818,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:06:35+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2018-01-03 and allocated (dated 1992-01-10) on 2018-01-04. It wasn't in APNIC's statistics before, so it wasn't APNIC's unissued inventory; it may have come from another registry in a transfer not yet in the log."}]},"arin_statistics_now":{"status":"not listed"}}