{"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":"104.251.121.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/104.251.121.0-104.251.121.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2026-11-09)"},"current_holder":{"rir":"ARIN","org":"National Association for Public Health Statistics and Information Systems","handle":"NAPHSIS","how":"RDAP, looked up 2026-11-11 18:20 UTC"},"rdap_snapshots":[{"resource_type":"ipv4","start_key":"00000000000000000000000068fb7900","end_key":"00000000000000000000000068fb79ff","captured_at":"2026-11-11T18:20:36+00:00","reason":"24h","authoritative_rir":"ARIN","handle":"NET-104-251-121-0-1","name":"NAPHSIS","status":"active","org_handle":"NAPHSIS","org_name":"National Association for Public Health Statistics and Information Systems","registration_date":"2026-11-09T14:27:21-05:00","last_changed_date":"2026-11-09T14:27:21-05:00","rdap_url":"https://rdap.arin.net/registry/ip/104.251.121.0"},{"resource_type":"ipv4","start_key":"00000000000000000000000068fb7900","end_key":"00000000000000000000000068fb79ff","captured_at":"2026-11-10T18:20:24+00:00","reason":"first","authoritative_rir":"ARIN","handle":"NET-104-251-121-0-1","name":"NAPHSIS","status":"active","org_handle":"NAPHSIS","org_name":"National Association for Public Health Statistics and Information Systems","registration_date":"2026-11-09T14:27:21-05:00","last_changed_date":"2026-11-09T14:27:21-05:00","rdap_url":"https://rdap.arin.net/registry/ip/104.251.121.0"}],"transfers":[{"id":134719,"date":"2026-11-09T19:27:21Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"1st Class Hosting, LLC","recipient_org":"National Association for Public Health Statistics and Information Systems","range":"104.251.121.0/24","log":"ARIN"}],"events":[{"event_id":"ca582c4baf180788","registry":"ARIN","report_date":"2026-11-09","source":"arin_issued","raw_action":"ADD","raw_line":"Add 104.251.121.0-104.251.121.255","resource_type":"ipv4","resource":"104.251.121.0/24","start":"104.251.121.0","end":"104.251.121.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"1st Class Hosting, LLC","recipient_organization":"National Association for Public Health Statistics and Information Systems","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":true,"classifier_version":"1.4.0","classified_at":"2026-11-10T18:27:01+00:00","page":"https://rirtracker.com/ip/104.251.121.0-104.251.121.255/#e-ca582c4baf180788","report_page":"https://rirtracker.com/arin/reports/2026-11-09/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/104.251.121.0-104.251.121.255.json","explanation":"ARIN's transfer log records a transfer from 1st Class Hosting, LLC (ARIN) to National Association for Public Health Statistics and Information Systems (ARIN) on 2026-11-09 19:27 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-November/006543.html","retrieved_at":"2026-11-10T18:17:05+00:00","summary":"ARIN-Issued report for 2026-11-09: \"Add 104.251.121.0-104.251.121.255\""},{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-11-10T18:17:08+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2026-11-09 19:27 UTC, 1st Class Hosting, LLC (ARIN) to National Association for Public Health Statistics and Information Systems (ARIN); resources moved: 104.251.121.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261108","retrieved_at":"2026-11-08T18:17:14+00:00","summary":"ARIN delegated statistics 2026-11-08 (produced 2026-11-08T14:00:21+00:00), before the report: allocated (dated 2014-12-19)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20261110","retrieved_at":"2026-11-10T18:17:13+00:00","summary":"ARIN delegated statistics 2026-11-10 (produced 2026-11-10T14:00:21+00:00), after the report: allocated (dated 2026-11-09)"}]}],"classification_history":{"ca582c4baf180788":[{"raw_change_id":580046,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-11-10T18:27:01+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from 1st Class Hosting, LLC (ARIN) to National Association for Public Health Statistics and Information Systems (ARIN) on 2026-11-09 19:27 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 2026-11-09)"}}