{"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":"101.1.16.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2026-10-21), allocated (dated 2026-10-22), allocated (dated 2026-10-23), assigned (dated 2026-10-21), assigned (dated 2026-10-22), assigned (dated 2026-10-23)"},"current_holder":{"rir":"APNIC","org":"GlobalCache Technology Co., Ltd.","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":127104,"date":"2021-02-19T01:31:39Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"AS Data(Hong Kong)Limited","recipient_org":"GlobalCache Technology Co., Ltd.","range":"101.1.16.0/20","log":"APNIC"},{"id":124078,"date":"2014-10-03T06:15:41Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Asia Data (Hong kong) Inc. Limited","recipient_org":"AS Data(Hong Kong)Limited","range":"101.1.16.0/20","log":"APNIC"}],"events":[{"event_id":"6f00c52cff245c50","registry":"APNIC","report_date":"2022-11-23","source":"statistics","raw_action":"RELEASED","raw_line":null,"resource_type":"ipv4","resource":"101.1.16.0/20","start":"101.1.16.0","end":"101.1.31.255","classification":"HOLD_RELEASED","classification_label":"Released from hold (APNIC lists it as 'available')","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"APNIC's statistics now list it as 'available'; reissue not confirmed","inventory_effect_code":"RELEASED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:14:37+00:00","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/#e-6f00c52cff245c50","report_page":"https://rirtracker.com/apnic/reports/2022-11-23/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/101.1.16.0-101.1.31.255.json","observed":"101.1.16.0/20 reserved on 2022-11-23, available on 2022-11-24","explanation":"APNIC's statistics show it reserved on 2022-11-23 and available on 2022-11-24. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2021-11-16, 372 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221124.gz","retrieved_at":"2026-10-13T00:26:52+00:00","summary":"Found by comparing APNIC's daily statistics: 101.1.16.0/20 reserved on 2022-11-23, available on 2022-11-24"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221123.gz","retrieved_at":"2026-10-13T00:26:49+00:00","summary":"APNIC delegated statistics 2022-11-23, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221124.gz","retrieved_at":"2026-10-13T00:26:52+00:00","summary":"APNIC delegated statistics 2022-11-24, after the change: available"}]},{"event_id":"b9cccffee3dbad1a","registry":"APNIC","report_date":"2021-11-16","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"101.1.16.0/20","start":"101.1.16.0","end":"101.1.31.255","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":"2026-10-14T00:13:09+00:00","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/#e-b9cccffee3dbad1a","report_page":"https://rirtracker.com/apnic/reports/2021-11-16/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/101.1.16.0-101.1.31.255.json","observed":"101.1.16.0/20 allocated on 2021-11-16, reserved on 2021-11-17","hold":{"hold_rule_source_url":"https://www.apnic.net/manage-ip/manage-resources/address-status","hold_rule_months":12,"estimated_hold_end":"2022-11-16","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 2010-12-10) on 2021-11-16 and reserved on 2021-11-17. 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 2022-11-16. That is what APNIC has done, not a rule it states. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20211117.gz","retrieved_at":"2026-10-12T23:58:18+00:00","summary":"Found by comparing APNIC's daily statistics: 101.1.16.0/20 allocated on 2021-11-16, reserved on 2021-11-17"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20211116.gz","retrieved_at":"2026-10-12T23:58:14+00:00","summary":"APNIC delegated statistics 2021-11-16, before the change: allocated (dated 2010-12-10)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20211117.gz","retrieved_at":"2026-10-12T23:58:18+00:00","summary":"APNIC delegated statistics 2021-11-17, after the change: reserved"}]},{"event_id":"1214d1d5d01f75dc","registry":"APNIC","report_date":"2021-02-19","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"101.1.16.0/20","start":"101.1.16.0","end":"101.1.31.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"AS Data(Hong Kong)Limited","recipient_organization":"GlobalCache Technology Co., Ltd.","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:42+00:00","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/#e-1214d1d5d01f75dc","report_page":"https://rirtracker.com/apnic/reports/2021-02-19/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/101.1.16.0-101.1.31.255.json","observed":"Transfer: AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC)","explanation":"APNIC's transfer log records a transfer from AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC) on 2021-02-19 01:31 UTC. The registration changed hands; it is not a new allocation from APNIC.","evidence":[{"type":"transfer","url":"https://ftp.apnic.net/stats/apnic/transfers/transfers_latest.json","retrieved_at":"2026-10-13T18:17:16+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2021-02-19 01:31 UTC, AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC); resources moved: 101.1.16.0/20"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20210219.gz","retrieved_at":"2026-10-12T23:38:42+00:00","summary":"APNIC delegated statistics 2021-02-19, before the change: allocated (dated 2010-12-10)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20210220.gz","retrieved_at":"2026-10-12T23:38:45+00:00","summary":"APNIC delegated statistics 2021-02-20, after the change: allocated (dated 2010-12-10)"}]},{"event_id":"fd2cd041d436a5b9","registry":"APNIC","report_date":"2014-10-03","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"101.1.16.0/20","start":"101.1.16.0","end":"101.1.31.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Asia Data (Hong kong) Inc. Limited","recipient_organization":"AS Data(Hong Kong)Limited","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:30+00:00","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/#e-fd2cd041d436a5b9","report_page":"https://rirtracker.com/apnic/reports/2014-10-03/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/101.1.16.0-101.1.31.255.json","observed":"Transfer: Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC)","explanation":"APNIC's transfer log records a transfer from Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC) on 2014-10-03 06:15 UTC. The registration changed hands; it is not a new allocation from APNIC.","evidence":[{"type":"transfer","url":"https://ftp.apnic.net/stats/apnic/transfers/transfers_latest.json","retrieved_at":"2026-10-13T18:17:16+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2014-10-03 06:15 UTC, Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC); resources moved: AS55298, AS132541, 43.243.176.0/22, 101.1.16.0/20, 103.245.208.0/22, 183.90.184.0/21"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2014/delegated-apnic-extended-20141003.gz","retrieved_at":"2026-10-12T21:02:45+00:00","summary":"APNIC delegated statistics 2014-10-03, before the change: allocated (dated 2010-12-10)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2014/delegated-apnic-extended-20141004.gz","retrieved_at":"2026-10-12T21:02:49+00:00","summary":"APNIC delegated statistics 2014-10-04, after the change: allocated (dated 2010-12-10)"}]},{"event_id":"893a7908abb78c5c","registry":"APNIC","report_date":"2010-12-10","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"101.1.16.0/20","start":"101.1.16.0","end":"101.1.31.255","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":"2026-10-13T23:56:53+00:00","page":"https://rirtracker.com/ip/101.1.16.0-101.1.31.255/#e-893a7908abb78c5c","report_page":"https://rirtracker.com/apnic/reports/2010-12-10/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/101.1.16.0-101.1.31.255.json","observed":"101.1.16.0/20 not listed on 2010-12-10, allocated on 2010-12-11","explanation":"No transfer record matches. APNIC's statistics show it not listed on 2010-12-10 and allocated (dated 2010-12-10) on 2010-12-11. 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/2010/delegated-apnic-extended-20101211.gz","retrieved_at":"2026-10-12T19:29:25+00:00","summary":"Found by comparing APNIC's daily statistics: 101.1.16.0/20 not listed on 2010-12-10, allocated on 2010-12-11"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2010/delegated-apnic-extended-20101210.gz","retrieved_at":"2026-10-12T19:29:22+00:00","summary":"APNIC delegated statistics 2010-12-10, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2010/delegated-apnic-extended-20101211.gz","retrieved_at":"2026-10-12T19:29:25+00:00","summary":"APNIC delegated statistics 2010-12-11, after the change: allocated (dated 2010-12-10)"}]}],"classification_history":{"6f00c52cff245c50":[{"raw_change_id":499231,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:24:03+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2022-11-23 and available on 2022-11-24. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2021-11-16, 372 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":499231,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:24:50+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2022-11-23 and available on 2022-11-24. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2021-11-16, 372 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":499231,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:09:04+00:00","current":0,"public_explanation":"APNIC's statistics show it reserved on 2022-11-23 and available on 2022-11-24. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2021-11-16, 372 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed."},{"raw_change_id":499231,"classification_code":"HOLD_RELEASED","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:14:37+00:00","current":1,"public_explanation":"APNIC's statistics show it reserved on 2022-11-23 and available on 2022-11-24. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2021-11-16, 372 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed."}],"b9cccffee3dbad1a":[{"raw_change_id":478994,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:13:51+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 2010-12-10) on 2021-11-16 and reserved on 2021-11-17. 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."},{"raw_change_id":478994,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:23:39+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 2010-12-10) on 2021-11-16 and reserved on 2021-11-17. 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."},{"raw_change_id":478994,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:07:48+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 2010-12-10) on 2021-11-16 and reserved on 2021-11-17. 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."},{"raw_change_id":478994,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:13:09+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 2010-12-10) on 2021-11-16 and reserved on 2021-11-17. 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 2022-11-16. That is what APNIC has done, not a rule it states. This does not confirm availability."}],"1214d1d5d01f75dc":[{"raw_change_id":37517,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:36:41+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC) on 2021-02-19 01:31 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37517,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:56+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC) on 2021-02-19 01:31 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37517,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:07+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC) on 2021-02-19 01:31 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37517,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:42+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from AS Data(Hong Kong)Limited (APNIC) to GlobalCache Technology Co., Ltd. (APNIC) on 2021-02-19 01:31 UTC. The registration changed hands; it is not a new allocation from APNIC."}],"fd2cd041d436a5b9":[{"raw_change_id":32597,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:34:37+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC) on 2014-10-03 06:15 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":32597,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:46+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC) on 2014-10-03 06:15 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":32597,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:43:56+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC) on 2014-10-03 06:15 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":32597,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:30+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from Asia Data (Hong kong) Inc. Limited (APNIC) to AS Data(Hong Kong)Limited (APNIC) on 2014-10-03 06:15 UTC. The registration changed hands; it is not a new allocation from APNIC."}],"893a7908abb78c5c":[{"raw_change_id":236069,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:22:50+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2010-12-10 and allocated (dated 2010-12-10) on 2010-12-11. 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":236069,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:05+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2010-12-10 and allocated (dated 2010-12-10) on 2010-12-11. 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":236069,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:10+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2010-12-10 and allocated (dated 2010-12-10) on 2010-12-11. 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":236069,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:53+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it not listed on 2010-12-10 and allocated (dated 2010-12-10) on 2010-12-11. 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"}}