{"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":"163.181.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/163.181.0.0-163.181.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2016-12-13)"},"current_holder":{"rir":"ARIN","org":"Alibaba.com LLC","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":8400,"date":"2016-12-13T17:19:03Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Advanced Micro Devices, Inc.","recipient_org":"Alibaba.com LLC","range":"163.181.0.0/16","log":"ARIN"}],"events":[{"event_id":"fc8c9adab4c501fa","registry":"ARIN","report_date":"2016-12-13","source":"arin_issued","raw_action":"ADD","raw_line":"Add 163.181.0.0-163.181.255.255","resource_type":"ipv4","resource":"163.181.0.0/16","start":"163.181.0.0","end":"163.181.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Advanced Micro Devices, Inc.","recipient_organization":"Alibaba.com LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:40+00:00","page":"https://rirtracker.com/ip/163.181.0.0-163.181.255.255/#e-fc8c9adab4c501fa","report_page":"https://rirtracker.com/arin/reports/2016-12-13/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.181.0.0-163.181.255.255.json","explanation":"ARIN's transfer log records a transfer from Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN) on 2016-12-13 17:19 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2016-December/002924.html","retrieved_at":"2026-10-12T18:39:27+00:00","summary":"ARIN-Issued report for 2016-12-13: \"Add 163.181.0.0-163.181.255.255\""},{"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: RESOURCE_TRANSFER on 2016-12-13 17:19 UTC, Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN); resources moved: 163.181.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20161212.gz","retrieved_at":"2026-10-12T21:20:42+00:00","summary":"ARIN delegated statistics 2016-12-12 (produced 2016-12-12T06:10:17+00:00), before the report: assigned (dated 1992-08-12)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20161214.gz","retrieved_at":"2026-10-12T21:20:47+00:00","summary":"ARIN delegated statistics 2016-12-14 (produced 2016-12-14T06:09:49+00:00), after the report: assigned (dated 2016-12-13)"}]}],"classification_history":{"fc8c9adab4c501fa":[{"raw_change_id":146976,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:36:37+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN) on 2016-12-13 17:19 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146976,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:55+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN) on 2016-12-13 17:19 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146976,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:34+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN) on 2016-12-13 17:19 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":146976,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:40+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Advanced Micro Devices, Inc. (ARIN) to Alibaba.com LLC (ARIN) on 2016-12-13 17:19 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2016-12-13)"}}