{"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":"161.117.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/161.117.0.0-161.117.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 1992-07-09)"},"current_holder":{"rir":"APNIC","org":"Alibaba Cloud (Singapore) Private Limited","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":124864,"date":"2016-11-28T01:42:19Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Sensis Pty Ltd","recipient_org":"Alibaba Cloud (Singapore) Private Limited","range":"161.117.0.0/16","log":"APNIC"}],"events":[{"event_id":"e017a23dd97f8557","registry":"APNIC","report_date":"2016-11-28","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"161.117.0.0/16","start":"161.117.0.0","end":"161.117.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Sensis Pty Ltd","recipient_organization":"Alibaba Cloud (Singapore) Private Limited","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:33+00:00","page":"https://rirtracker.com/ip/161.117.0.0-161.117.255.255/#e-e017a23dd97f8557","report_page":"https://rirtracker.com/apnic/reports/2016-11-28/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.117.0.0-161.117.255.255.json","observed":"Transfer: Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC)","explanation":"APNIC's transfer log records a transfer from Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC) on 2016-11-28 01:42 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 2016-11-28 01:42 UTC, Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC); resources moved: 161.117.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2016/delegated-apnic-extended-20161128.gz","retrieved_at":"2026-10-12T21:52:15+00:00","summary":"APNIC delegated statistics 2016-11-28, before the change: allocated (dated 1992-07-09)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2016/delegated-apnic-extended-20161129.gz","retrieved_at":"2026-10-12T21:52:19+00:00","summary":"APNIC delegated statistics 2016-11-29, after the change: allocated (dated 1992-07-09)"}]},{"event_id":"698a0a9f9d3d07b2","registry":"APNIC","report_date":"2012-05-01","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"161.117.0.0/16","start":"161.117.0.0","end":"161.117.255.255","classification":"APPARENT_REISSUANCE","classification_label":"Apparent reissuance of previously removed resource","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from APNIC-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:09+00:00","page":"https://rirtracker.com/ip/161.117.0.0-161.117.255.255/#e-698a0a9f9d3d07b2","report_page":"https://rirtracker.com/apnic/reports/2012-05-01/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.117.0.0-161.117.255.255.json","observed":"161.117.0.0/16 reserved on 2012-05-01, allocated on 2012-05-02","explanation":"No transfer record matches. APNIC's statistics show it reserved on 2012-05-01 and allocated (dated 2012-05-01) on 2012-05-02. The tracker saw this range removed from registration on 2011-01-06 (161.117.0.0/16), so it appears to have been issued again from APNIC's pool.","evidence":[{"type":"statistics_diff","url":"https://ftp.apnic.net/stats/apnic/2012/delegated-apnic-extended-20120502.gz","retrieved_at":"2026-10-12T19:59:21+00:00","summary":"Found by comparing APNIC's daily statistics: 161.117.0.0/16 reserved on 2012-05-01, allocated on 2012-05-02"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2012/delegated-apnic-extended-20120501.gz","retrieved_at":"2026-10-12T19:59:18+00:00","summary":"APNIC delegated statistics 2012-05-01, before the change: reserved"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2012/delegated-apnic-extended-20120502.gz","retrieved_at":"2026-10-12T19:59:21+00:00","summary":"APNIC delegated statistics 2012-05-02, after the change: allocated (dated 2012-05-01)"}]},{"event_id":"2ab64bd60f5d68ab","registry":"APNIC","report_date":"2011-01-06","source":"statistics","raw_action":"REMOVED","raw_line":null,"resource_type":"ipv4","resource":"161.117.0.0/16","start":"161.117.0.0","end":"161.117.255.255","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/161.117.0.0-161.117.255.255/#e-2ab64bd60f5d68ab","report_page":"https://rirtracker.com/apnic/reports/2011-01-06/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.117.0.0-161.117.255.255.json","observed":"161.117.0.0/16 allocated on 2011-01-06, not listed on 2011-01-07","explanation":"Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 1992-07-09) on 2011-01-06 and not listed on 2011-01-07. 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-20110107.gz","retrieved_at":"2026-10-12T19:31:10+00:00","summary":"Found by comparing APNIC's daily statistics: 161.117.0.0/16 allocated on 2011-01-06, not listed on 2011-01-07"},{"type":"delegated_before","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, before the change: allocated (dated 1992-07-09)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2011/delegated-apnic-extended-20110107.gz","retrieved_at":"2026-10-12T19:31:10+00:00","summary":"APNIC delegated statistics 2011-01-07, after the change: not listed"}]}],"classification_history":{"e017a23dd97f8557":[{"raw_change_id":34068,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:35:14+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC) on 2016-11-28 01:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":34068,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:49+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC) on 2016-11-28 01:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":34068,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:43:59+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC) on 2016-11-28 01:42 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":34068,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:33+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from Sensis Pty Ltd (APNIC) to Alibaba Cloud (Singapore) Private Limited (APNIC) on 2016-11-28 01:42 UTC. The registration changed hands; it is not a new allocation from APNIC."}],"698a0a9f9d3d07b2":[{"raw_change_id":258624,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:35:08+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2012-05-01 and allocated (dated 2012-05-01) on 2012-05-02. The tracker saw this range removed from registration on 2011-01-06 (161.117.0.0/16), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":258624,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:11:12+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2012-05-01 and allocated (dated 2012-05-01) on 2012-05-02. The tracker saw this range removed from registration on 2011-01-06 (161.117.0.0/16), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":258624,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:54:24+00:00","current":0,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2012-05-01 and allocated (dated 2012-05-01) on 2012-05-02. The tracker saw this range removed from registration on 2011-01-06 (161.117.0.0/16), so it appears to have been issued again from APNIC's pool."},{"raw_change_id":258624,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:09+00:00","current":1,"public_explanation":"No transfer record matches. APNIC's statistics show it reserved on 2012-05-01 and allocated (dated 2012-05-01) on 2012-05-02. The tracker saw this range removed from registration on 2011-01-06 (161.117.0.0/16), so it appears to have been issued again from APNIC's pool."}],"2ab64bd60f5d68ab":[{"raw_change_id":237143,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T04:23:25+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 1992-07-09) on 2011-01-06 and not listed on 2011-01-07. 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":237143,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:10:08+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 1992-07-09) on 2011-01-06 and not listed on 2011-01-07. 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":237143,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:14+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 1992-07-09) on 2011-01-06 and not listed on 2011-01-07. 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":237143,"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 1992-07-09) on 2011-01-06 and not listed on 2011-01-07. 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"}}