{"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":"152.121.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/152.121.0.0-152.121.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 1991-08-15)"},"current_holder":{"rir":"ARIN","org":"U. S. Department of Transportation","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":43949,"date":"2026-05-18T15:38:08Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"U.S. Department of Transportation","recipient_org":"U. S. Department of Transportation","range":"152.121.0.0/16","log":"ARIN"}],"events":[{"event_id":"03d29fc757d30c17","registry":"ARIN","report_date":"2026-05-18","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"152.121.0.0/16","start":"152.121.0.0","end":"152.121.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"U.S. Department of Transportation","recipient_organization":"U. S. Department of Transportation","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:28+00:00","page":"https://rirtracker.com/ip/152.121.0.0-152.121.255.255/#e-03d29fc757d30c17","report_page":"https://rirtracker.com/arin/reports/2026-05-18/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/152.121.0.0-152.121.255.255.json","observed":"Merger/acquisition: U.S. Department of Transportation (ARIN) to U. S. Department of Transportation (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from U.S. Department of Transportation (ARIN) to U. S. Department of Transportation (ARIN) on 2026-05-18 15:38 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.","evidence":[{"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: MERGER_ACQUISITION on 2026-05-18 15:38 UTC, U.S. Department of Transportation (ARIN) to U. S. Department of Transportation (ARIN); resources moved: 152.121.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260517","retrieved_at":"2026-10-09T19:01:28+00:00","summary":"ARIN delegated statistics 2026-05-17 (produced 2026-05-17T13:00:41+00:00), before the report: allocated (dated 1991-08-15)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260519","retrieved_at":"2026-10-09T19:01:34+00:00","summary":"ARIN delegated statistics 2026-05-19 (produced 2026-05-19T13:00:41+00:00), after the report: allocated (dated 1991-08-15)"}]}],"classification_history":{"03d29fc757d30c17":[{"raw_change_id":576107,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:28+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from U.S. Department of Transportation (ARIN) to U. S. Department of Transportation (ARIN) on 2026-05-18 15:38 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it."}]},"arin_statistics_now":{"status":"allocated (dated 1991-08-15)"}}