{"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":"163.57.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/163.57.0.0-163.57.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2011-01-05)"},"current_holder":{"rir":"APNIC","org":"Microsoft Operations PTE Ltd","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":128558,"date":"2023-05-18T02:42:04Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Futaba Corporation","recipient_org":"Microsoft Operations PTE Ltd","range":"163.57.0.0/16","log":"APNIC"}],"events":[{"event_id":"94c05623950155e0","registry":"APNIC","report_date":"2023-05-18","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"163.57.0.0/16","start":"163.57.0.0","end":"163.57.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Futaba Corporation","recipient_organization":"Microsoft Operations PTE Ltd","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:47+00:00","page":"https://rirtracker.com/ip/163.57.0.0-163.57.255.255/#e-94c05623950155e0","report_page":"https://rirtracker.com/apnic/reports/2023-05-18/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.57.0.0-163.57.255.255.json","observed":"Transfer: Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC)","explanation":"APNIC's transfer log records a transfer from Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC) on 2023-05-18 02:42 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 2023-05-18 02:42 UTC, Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC); resources moved: 163.57.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230518.gz","retrieved_at":"2026-10-13T00:40:16+00:00","summary":"APNIC delegated statistics 2023-05-18, before the change: allocated (dated 2011-01-05)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230519.gz","retrieved_at":"2026-10-13T00:40:19+00:00","summary":"APNIC delegated statistics 2023-05-19, after the change: allocated (dated 2011-01-05)"}]},{"event_id":"87af297110028340","registry":"APNIC","report_date":"2022-12-12","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"163.57.0.0/16","start":"163.57.0.0","end":"163.57.255.255","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":"2026-10-14T00:14:40+00:00","page":"https://rirtracker.com/ip/163.57.0.0-163.57.255.255/#e-87af297110028340","report_page":"https://rirtracker.com/apnic/reports/2022-12-12/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.57.0.0-163.57.255.255.json","observed":"163.57.0.0/16 reserved on 2022-12-12, allocated on 2022-12-13","explanation":"No transfer record matches. APNIC's statistics show it reserved on 2022-12-12 and allocated (dated 2011-01-05) on 2022-12-13. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221213.gz","retrieved_at":"2026-10-13T00:28:12+00:00","summary":"Found by comparing APNIC's daily statistics: 163.57.0.0/16 reserved on 2022-12-12, allocated on 2022-12-13"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221212.gz","retrieved_at":"2026-10-13T00:28:09+00:00","summary":"APNIC delegated statistics 2022-12-12, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20221213.gz","retrieved_at":"2026-10-13T00:28:12+00:00","summary":"APNIC delegated statistics 2022-12-13, after the change: allocated (dated 2011-01-05)"}]},{"event_id":"05992ed7fd99529f","registry":"APNIC","report_date":"2011-01-05","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"163.57.0.0/16","start":"163.57.0.0","end":"163.57.255.255","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":"2026-10-13T23:56:56+00:00","page":"https://rirtracker.com/ip/163.57.0.0-163.57.255.255/#e-05992ed7fd99529f","report_page":"https://rirtracker.com/apnic/reports/2011-01-05/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.57.0.0-163.57.255.255.json","observed":"163.57.0.0/16 allocated on 2011-01-05, not listed on 2011-01-06","explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-24) on 2011-01-05 and not listed on 2011-01-06. Being gone from APNIC's statistics entirely can also mean it moved to another registry. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110106.gz","retrieved_at":"2026-10-12T19:31:06+00:00","summary":"Found by comparing APNIC's daily statistics: 163.57.0.0/16 allocated on 2011-01-05, not listed on 2011-01-06"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110105.gz","retrieved_at":"2026-10-12T19:31:03+00:00","summary":"APNIC delegated statistics 2011-01-05, before the change: allocated (dated 1992-07-24)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110106.gz","retrieved_at":"2026-10-12T19:31:06+00:00","summary":"APNIC delegated statistics 2011-01-06, after the change: not listed"}]}],"classification_history":{"94c05623950155e0":[{"raw_change_id":39739,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:37:39+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC) on 2023-05-18 02:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39739,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:02:01+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC) on 2023-05-18 02:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39739,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:12+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC) on 2023-05-18 02:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39739,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:47+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from Futaba Corporation (APNIC) to Microsoft Operations PTE Ltd (APNIC) on 2023-05-18 02:42 UTC. The registration changed hands; it is not a new allocation from APNIC."}],"87af297110028340":[{"raw_change_id":499976,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T06:24:21+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2022-12-12 and allocated (dated 2011-01-05) on 2022-12-13. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":499976,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:24:53+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2022-12-12 and allocated (dated 2011-01-05) on 2022-12-13. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":499976,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T15:09:07+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2022-12-12 and allocated (dated 2011-01-05) on 2022-12-13. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."},{"raw_change_id":499976,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-14T00:14:40+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2022-12-12 and allocated (dated 2011-01-05) on 2022-12-13. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance."}],"05992ed7fd99529f":[{"raw_change_id":237048,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:23:21+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 1992-07-24) on 2011-01-05 and not listed on 2011-01-06. Being gone from APNIC's statistics entirely can also mean it moved to another registry. 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":237048,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:07+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 1992-07-24) on 2011-01-05 and not listed on 2011-01-06. Being gone from APNIC's statistics entirely can also mean it moved to another registry. 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":237048,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:13+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 1992-07-24) on 2011-01-05 and not listed on 2011-01-06. Being gone from APNIC's statistics entirely can also mean it moved to another registry. 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":237048,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:56+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 1992-07-24) on 2011-01-05 and not listed on 2011-01-06. Being gone from APNIC's statistics entirely can also mean it moved to another registry. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability."}]},"arin_statistics_now":{"status":"not listed"}}