{"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":"139.138.56.0/21","resource_type":"ipv4","page":"https://rirtracker.com/ip/139.138.56.0-139.138.63.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2017-07-06)"},"current_holder":{"rir":"ARIN","org":"Cisco Systems Ironport Division","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":10234,"date":"2017-07-06T17:44:45Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Data I/O Corporation","recipient_org":"Cisco Systems Ironport Division","range":"139.138.56.0/21","log":"ARIN"}],"events":[{"event_id":"3c0fb5f930950d4d","registry":"ARIN","report_date":"2017-07-06","source":"arin_issued","raw_action":"ADD","raw_line":"Add 139.138.56.0-139.138.63.255","resource_type":"ipv4","resource":"139.138.56.0/21","start":"139.138.56.0","end":"139.138.63.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Data I/O Corporation","recipient_organization":"Cisco Systems Ironport Division","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:49+00:00","page":"https://rirtracker.com/ip/139.138.56.0-139.138.63.255/#e-3c0fb5f930950d4d","report_page":"https://rirtracker.com/arin/reports/2017-07-06/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/139.138.56.0-139.138.63.255.json","explanation":"ARIN's transfer log records a transfer from Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN) on 2017-07-06 17:44 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/2017-July/003130.html","retrieved_at":"2026-10-12T18:39:42+00:00","summary":"ARIN-Issued report for 2017-07-06: \"Add 139.138.56.0-139.138.63.255\""},{"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 2017-07-06 17:44 UTC, Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN); resources moved: 139.138.56.0/21"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170705.gz","retrieved_at":"2026-10-12T21:30:39+00:00","summary":"ARIN delegated statistics 2017-07-05 (produced 2017-07-05T05:09:16+00:00), before the report: assigned (dated 1990-03-13)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170707.gz","retrieved_at":"2026-10-12T21:30:51+00:00","summary":"ARIN delegated statistics 2017-07-07 (produced 2017-07-07T05:09:44+00:00), after the report: assigned (dated 2017-07-06)"}]}],"classification_history":{"3c0fb5f930950d4d":[{"raw_change_id":149817,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:38:38+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN) on 2017-07-06 17:44 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":149817,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:02+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN) on 2017-07-06 17:44 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":149817,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:42+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN) on 2017-07-06 17:44 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":149817,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:49+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Data I/O Corporation (ARIN) to Cisco Systems Ironport Division (ARIN) on 2017-07-06 17:44 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 2017-07-06)"}}