{"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":"52.81.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/52.81.0.0-52.81.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 1991-12-19)"},"current_holder":{"rir":"APNIC","org":"China Internet Network Information Center/sinnet","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":125595,"date":"2017-11-20T03:55:59Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Amazon Connection Technology Services (Beijing) Co., LTD","recipient_org":"China Internet Network Information Center/sinnet","range":"52.81.0.0/16","log":"APNIC"},{"id":6146,"date":"2015-11-16T16:04:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"Amazon.com, Inc.","recipient_org":null,"range":"52.80.0.0/14","log":"ARIN"},{"id":124296,"date":"2015-11-16T08:46:58Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"AMAZO-47","recipient_org":"Amazon Connection Technology Services (Beijing) Co., LTD","range":"52.80.0.0/14","log":"APNIC"},{"id":5613,"date":"2015-01-21T18:11:31Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"E.I. du Pont de Nemours and Co., Inc.","recipient_org":"Amazon Technologies Inc.","range":"52.80.0.0/12","log":"ARIN"},{"id":5609,"date":"2015-01-21T18:11:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"E.I. du Pont de Nemours and Co., Inc.","recipient_org":"Amazon Technologies Inc.","range":"52.64.0.0/11","log":"ARIN"}],"events":[{"event_id":"930266e9635630c1","registry":"APNIC","report_date":"2017-11-20","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"52.81.0.0/16","start":"52.81.0.0","end":"52.81.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Amazon Connection Technology Services (Beijing) Co., LTD","recipient_organization":"China Internet Network Information Center/sinnet","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:36+00:00","page":"https://rirtracker.com/ip/52.81.0.0-52.81.255.255/#e-930266e9635630c1","report_page":"https://rirtracker.com/apnic/reports/2017-11-20/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/52.81.0.0-52.81.255.255.json","observed":"Transfer: Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC)","explanation":"APNIC's transfer log records a transfer from Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC) on 2017-11-20 03:55 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 2017-11-20 03:55 UTC, Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC); resources moved: 52.81.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2017/delegated-apnic-extended-20171120.gz","retrieved_at":"2026-10-12T22:16:34+00:00","summary":"APNIC delegated statistics 2017-11-20, before the change: allocated (dated 1991-12-19)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2017/delegated-apnic-extended-20171121.gz","retrieved_at":"2026-10-12T22:16:38+00:00","summary":"APNIC delegated statistics 2017-11-21, after the change: allocated (dated 1991-12-19)"}]}],"classification_history":{"930266e9635630c1":[{"raw_change_id":35039,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:35:37+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC) on 2017-11-20 03:55 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":35039,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:51+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC) on 2017-11-20 03:55 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":35039,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:01+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC) on 2017-11-20 03:55 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":35039,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:36+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from Amazon Connection Technology Services (Beijing) Co., LTD (APNIC) to China Internet Network Information Center/sinnet (APNIC) on 2017-11-20 03:55 UTC. The registration changed hands; it is not a new allocation from APNIC."}]},"arin_statistics_now":{"status":"not listed"}}