{"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":"173.0.208.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/173.0.208.0-173.0.223.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2010-06-29)"},"current_holder":{"rir":"ARIN","org":"Vianet Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":36555,"date":"2024-08-30T16:30:38Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Vianet","recipient_org":"Vianet Inc.","range":"173.0.208.0/20","log":"ARIN"}],"events":[{"event_id":"2273226c06082365","registry":"ARIN","report_date":"2024-08-30","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"173.0.208.0/20","start":"173.0.208.0","end":"173.0.223.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Vianet","recipient_organization":"Vianet Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:16+00:00","page":"https://rirtracker.com/ip/173.0.208.0-173.0.223.255/#e-2273226c06082365","report_page":"https://rirtracker.com/arin/reports/2024-08-30/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/173.0.208.0-173.0.223.255.json","observed":"Merger/acquisition: Vianet (ARIN) to Vianet Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Vianet (ARIN) to Vianet Inc. (ARIN) on 2024-08-30 16:30 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.","evidence":[{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-13T13:57:20+00:00","summary":"Transfer log: MERGER_ACQUISITION on 2024-08-30 16:30 UTC, Vianet (ARIN) to Vianet Inc. (ARIN); resources moved: 173.0.208.0/20"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240829.gz","retrieved_at":"2026-10-12T23:45:49+00:00","summary":"ARIN delegated statistics 2024-08-29 (produced 2024-08-29T13:00:54+00:00), before the report: allocated (dated 2010-06-29)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240831.gz","retrieved_at":"2026-10-12T23:45:54+00:00","summary":"ARIN delegated statistics 2024-08-31 (produced 2024-08-31T13:00:51+00:00), after the report: allocated (dated 2010-06-29)"}]},{"event_id":"188b7506b64d8446","registry":"ARIN","report_date":"2010-06-29","source":"arin_issued","raw_action":"ADD","raw_line":"Add 173.0.208.0-173.0.223.255","resource_type":"ipv4","resource":"173.0.208.0/20","start":"173.0.208.0","end":"173.0.223.255","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 ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:49+00:00","page":"https://rirtracker.com/ip/173.0.208.0-173.0.223.255/#e-188b7506b64d8446","report_page":"https://rirtracker.com/arin/reports/2010-06-29/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/173.0.208.0-173.0.223.255.json","explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-06-28 and allocated (dated 2010-06-29) on 2010-06-30. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2010-04-12 (173.0.0.0-173.0.255.255), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2010-June/000560.html","retrieved_at":"2026-10-12T18:36:43+00:00","summary":"ARIN-Issued report for 2010-06-29: \"Add 173.0.208.0-173.0.223.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2010/delegated-arin-20100628.gz","retrieved_at":"2026-10-12T19:07:02+00:00","summary":"ARIN delegated statistics 2010-06-28, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2010/delegated-arin-20100630.gz","retrieved_at":"2026-10-12T19:07:06+00:00","summary":"ARIN delegated statistics 2010-06-30, after the report: allocated (dated 2010-06-29)"}]}],"classification_history":{"2273226c06082365":[{"raw_change_id":571559,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:16+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Vianet (ARIN) to Vianet Inc. (ARIN) on 2024-08-30 16:30 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it."}],"188b7506b64d8446":[{"raw_change_id":121498,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:12:19+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-06-28 and allocated (dated 2010-06-29) on 2010-06-30. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2010-04-12 (173.0.0.0-173.0.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":121498,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:17+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-06-28 and allocated (dated 2010-06-29) on 2010-06-30. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2010-04-12 (173.0.0.0-173.0.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":121498,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:50+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-06-28 and allocated (dated 2010-06-29) on 2010-06-30. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2010-04-12 (173.0.0.0-173.0.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":121498,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:49+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-06-28 and allocated (dated 2010-06-29) on 2010-06-30. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2010-04-12 (173.0.0.0-173.0.255.255), so it appears to have been issued again from ARIN's pool."}]},"arin_statistics_now":{"status":"allocated (dated 2010-06-29)"}}