{"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":"121.91.136.0/21","resource_type":"ipv4","page":"https://rirtracker.com/ip/121.91.136.0-121.91.143.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2007-11-26)"},"current_holder":{"rir":"APNIC","org":"China Unicom (Hong Kong) Operations Limited","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":128517,"date":"2023-05-02T05:49:01Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Iseek Communications Pty Ltd","recipient_org":"China Unicom (Hong Kong) Operations Limited","range":"121.91.136.0/21","log":"APNIC"}],"events":[{"event_id":"043943a660e10b82","registry":"APNIC","report_date":"2023-05-02","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"121.91.136.0/21","start":"121.91.136.0","end":"121.91.143.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Iseek Communications Pty Ltd","recipient_organization":"China Unicom (Hong Kong) Operations Limited","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:47+00:00","page":"https://rirtracker.com/ip/121.91.136.0-121.91.143.255/#e-043943a660e10b82","report_page":"https://rirtracker.com/apnic/reports/2023-05-02/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/121.91.136.0-121.91.143.255.json","observed":"Transfer: Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC)","piece_of":{"resource":"121.91.128.0/17","page":"https://rirtracker.com/ip/121.91.128.0-121.91.255.255/"},"explanation":"APNIC's transfer log records a transfer from Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC) on 2023-05-02 05:49 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 2023-05-02 05:49 UTC, Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC); resources moved: 121.91.88.0/21, 121.91.136.0/21"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230502.gz","retrieved_at":"2026-10-13T00:39:05+00:00","summary":"APNIC delegated statistics 2023-05-02, before the change: allocated (dated 2007-11-26)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2023/delegated-apnic-extended-20230503.gz","retrieved_at":"2026-10-13T00:39:09+00:00","summary":"APNIC delegated statistics 2023-05-03, after the change: allocated (dated 2007-11-26)"}]}],"classification_history":{"043943a660e10b82":[{"raw_change_id":39687,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:37:37+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC) on 2023-05-02 05:49 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39687,"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 Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC) on 2023-05-02 05:49 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39687,"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 Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC) on 2023-05-02 05:49 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":39687,"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 Iseek Communications Pty Ltd (APNIC) to China Unicom (Hong Kong) Operations Limited (APNIC) on 2023-05-02 05:49 UTC. The registration changed hands; it is not a new allocation from APNIC."}]},"arin_statistics_now":{"status":"not listed"}}