{"classifier_version":"1.0.0","generated":"2026-10-09T21:19:22+00:00","documentation":"https://rirtracker.com/api/","disclaimer":"This site independently analyzes publicly available Internet number-resource records. It is not affiliated with or endorsed by the American Registry for Internet Numbers (ARIN), the Number Resource Organization (NRO), or any 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":"161.13.128.0/19","resource_type":"ipv4","page":"https://rirtracker.com/ip/161.13.128.0-161.13.159.255/","arin_statistics_now":{"file_date":"2026-10-09","status":"allocated (dated 2026-03-03)"},"current_holder":{"rir":"ARIN","org":"Callabyte Technology, LLC","how":"ARIN's statistics for 2026-10-09 and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":43063,"date":"2026-03-03T19:49:56Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Southwestern University","recipient_org":"Callabyte Technology, LLC","range":"161.13.128.0/19"}],"events":[{"event_id":"501abda9a50d5e89","report_date":"2026-03-03","source":"arin_issued","raw_action":"ADD","raw_line":"Add 161.13.128.0-161.13.159.255","resource_type":"ipv4","resource":"161.13.128.0/19","start":"161.13.128.0","end":"161.13.159.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Southwestern University","recipient_organization":"Callabyte Technology, LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","page":"https://rirtracker.com/ip/161.13.128.0-161.13.159.255/#e-501abda9a50d5e89","evidence_url":"https://rirtracker.com/api/v1/events/501abda9a50d5e89.json","piece_of":{"resource":"161.13.128.0/17","page":"https://rirtracker.com/ip/161.13.128.0-161.13.255.255/"},"explanation":"ARIN's transfer log records a transfer from Southwestern University (ARIN) to Callabyte Technology, LLC (ARIN) on 2026-03-03 19:49 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/2026-March/006289.html","retrieved_at":"2026-10-09T18:53:56+00:00","summary":"ARIN-Issued report for 2026-03-03: \"Add 161.13.128.0-161.13.159.255\""},{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-09T18:54:15+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2026-03-03 19:49 UTC, Southwestern University (ARIN) to Callabyte Technology, LLC (ARIN); resources moved: 161.13.128.0/19"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260302","retrieved_at":"2026-10-09T18:57:29+00:00","summary":"ARIN delegated statistics 2026-03-02 (produced 2026-03-02T14:00:50+00:00), before the report: allocated (dated 1992-04-27)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260304","retrieved_at":"2026-10-09T18:57:36+00:00","summary":"ARIN delegated statistics 2026-03-04 (produced 2026-03-04T14:00:50+00:00), after the report: allocated (dated 2026-03-03)"}]}],"classification_history":{"501abda9a50d5e89":[{"raw_change_id":990,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.0.0","classified_at":"2026-10-09T19:28:18+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Southwestern University (ARIN) to Callabyte Technology, LLC (ARIN) on 2026-03-03 19:49 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]}}