{"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":"AS21910","resource_type":"asn","page":"https://rirtracker.com/asn/21910/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2001-07-11)"},"current_holder":{"rir":"ARIN","org":"MCI Communications Services, Inc. d/b/a Verizon Business","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":288,"date":"2016-08-01T17:53:31Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Data Return","recipient_org":"MCI Communications Services, Inc. d/b/a Verizon Business","range":"AS21910","log":"ARIN"}],"events":[{"event_id":"df45f4938131de16","registry":"ARIN","report_date":"2016-08-01","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"asn","resource":"AS21910","start":21910,"end":21910,"classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Data Return","recipient_organization":"MCI Communications Services, Inc. d/b/a Verizon Business","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:25+00:00","page":"https://rirtracker.com/asn/21910/#e-df45f4938131de16","report_page":"https://rirtracker.com/arin/reports/2016-08-01/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/21910.json","observed":"Merger/acquisition: Data Return (ARIN) to MCI Communications Services, Inc. d/b/a Verizon Business (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Data Return (ARIN) to MCI Communications Services, Inc. d/b/a Verizon Business (ARIN) on 2016-08-01 17:53 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 2016-08-01 17:53 UTC, Data Return (ARIN) to MCI Communications Services, Inc. d/b/a Verizon Business (ARIN); resources moved: AS21910"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160731.gz","retrieved_at":"2026-10-12T21:14:02+00:00","summary":"ARIN delegated statistics 2016-07-31 (produced 2016-07-31T05:09:49+00:00), before the report: assigned (dated 2001-07-11)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160802.gz","retrieved_at":"2026-10-12T21:14:07+00:00","summary":"ARIN delegated statistics 2016-08-02 (produced 2016-08-02T05:10:18+00:00), after the report: assigned (dated 2001-07-11)"}]}],"classification_history":{"df45f4938131de16":[{"raw_change_id":550497,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:25+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Data Return (ARIN) to MCI Communications Services, Inc. d/b/a Verizon Business (ARIN) on 2016-08-01 17:53 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":"assigned (dated 2001-07-11)"}}