{"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":"74.121.144.0/22","resource_type":"ipv4","page":"https://rirtracker.com/ip/74.121.144.0-74.121.147.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2010-01-19)"},"current_holder":{"rir":"ARIN","org":"NuVasive Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":19076,"date":"2019-10-16T20:35:23Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Nuvasive Clinical Services Monitoring, Inc.","recipient_org":"NuVasive Inc.","range":"74.121.144.0/22","log":"ARIN"},{"id":16963,"date":"2019-02-12T16:50:57Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Biotronic NeuroNetwork","recipient_org":"Nuvasive Clinical Services Monitoring, Inc.","range":"74.121.144.0/22","log":"ARIN"}],"events":[{"event_id":"a55ed57d0bb3e1c8","registry":"ARIN","report_date":"2019-10-16","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"74.121.144.0/22","start":"74.121.144.0","end":"74.121.147.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Nuvasive Clinical Services Monitoring, Inc.","recipient_organization":"NuVasive Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:47+00:00","page":"https://rirtracker.com/ip/74.121.144.0-74.121.147.255/#e-a55ed57d0bb3e1c8","report_page":"https://rirtracker.com/arin/reports/2019-10-16/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/74.121.144.0-74.121.147.255.json","observed":"Merger/acquisition: Nuvasive Clinical Services Monitoring, Inc. (ARIN) to NuVasive Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Nuvasive Clinical Services Monitoring, Inc. (ARIN) to NuVasive Inc. (ARIN) on 2019-10-16 20:35 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 2019-10-16 20:35 UTC, Nuvasive Clinical Services Monitoring, Inc. (ARIN) to NuVasive Inc. (ARIN); resources moved: 74.121.144.0/22"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20191015.gz","retrieved_at":"2026-10-12T22:12:48+00:00","summary":"ARIN delegated statistics 2019-10-15 (produced 2019-10-15T14:00:13+00:00), before the report: assigned (dated 2010-01-19)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20191017.gz","retrieved_at":"2026-10-12T22:12:53+00:00","summary":"ARIN delegated statistics 2019-10-17 (produced 2019-10-17T14:00:13+00:00), after the report: assigned (dated 2010-01-19)"}]},{"event_id":"90a864dfa7b5acec","registry":"ARIN","report_date":"2019-02-12","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"74.121.144.0/22","start":"74.121.144.0","end":"74.121.147.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Biotronic NeuroNetwork","recipient_organization":"Nuvasive Clinical Services Monitoring, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:43+00:00","page":"https://rirtracker.com/ip/74.121.144.0-74.121.147.255/#e-90a864dfa7b5acec","report_page":"https://rirtracker.com/arin/reports/2019-02-12/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/74.121.144.0-74.121.147.255.json","observed":"Merger/acquisition: Biotronic NeuroNetwork (ARIN) to Nuvasive Clinical Services Monitoring, Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Biotronic NeuroNetwork (ARIN) to Nuvasive Clinical Services Monitoring, Inc. (ARIN) on 2019-02-12 16:50 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 2019-02-12 16:50 UTC, Biotronic NeuroNetwork (ARIN) to Nuvasive Clinical Services Monitoring, Inc. (ARIN); resources moved: 74.121.144.0/22"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190211.gz","retrieved_at":"2026-10-12T22:00:09+00:00","summary":"ARIN delegated statistics 2019-02-11 (produced 2019-02-11T06:00:16+00:00), before the report: assigned (dated 2010-01-19)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190213.gz","retrieved_at":"2026-10-12T22:00:14+00:00","summary":"ARIN delegated statistics 2019-02-13 (produced 2019-02-13T06:00:19+00:00), after the report: assigned (dated 2010-01-19)"}]},{"event_id":"f6d94232c4979eed","registry":"ARIN","report_date":"2010-01-19","source":"arin_issued","raw_action":"ADD","raw_line":"Add 74.121.144.0-74.121.147.255","resource_type":"ipv4","resource":"74.121.144.0/22","start":"74.121.144.0","end":"74.121.147.255","classification":"APPARENT_NEW_ISSUANCE","classification_label":"Apparent new issuance","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:47+00:00","page":"https://rirtracker.com/ip/74.121.144.0-74.121.147.255/#e-f6d94232c4979eed","report_page":"https://rirtracker.com/arin/reports/2010-01-19/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/74.121.144.0-74.121.147.255.json","explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-01-18 and assigned (dated 2010-01-19) on 2010-01-20. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2010-January/000399.html","retrieved_at":"2026-10-12T18:36:32+00:00","summary":"ARIN-Issued report for 2010-01-19: \"Add 74.121.144.0-74.121.147.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2010/delegated-arin-20100118.gz","retrieved_at":"2026-10-12T19:00:18+00:00","summary":"ARIN delegated statistics 2010-01-18, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2010/delegated-arin-20100120.gz","retrieved_at":"2026-10-12T19:00:23+00:00","summary":"ARIN delegated statistics 2010-01-20, after the report: assigned (dated 2010-01-19)"}]}],"classification_history":{"a55ed57d0bb3e1c8":[{"raw_change_id":559439,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:47+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Nuvasive Clinical Services Monitoring, Inc. (ARIN) to NuVasive Inc. (ARIN) on 2019-10-16 20:35 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."}],"90a864dfa7b5acec":[{"raw_change_id":557936,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:43+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Biotronic NeuroNetwork (ARIN) to Nuvasive Clinical Services Monitoring, Inc. (ARIN) on 2019-02-12 16:50 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."}],"f6d94232c4979eed":[{"raw_change_id":120766,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:11:48+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-01-18 and assigned (dated 2010-01-19) on 2010-01-20. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2009-01-14 (74.96.0.0-74.124.159.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":120766,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:16+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-01-18 and assigned (dated 2010-01-19) on 2010-01-20. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2009-01-14 (74.96.0.0-74.124.159.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":120766,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:49+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-01-18 and assigned (dated 2010-01-19) on 2010-01-20. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2009-01-14 (74.96.0.0-74.124.159.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":120766,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:47+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2010-01-18 and assigned (dated 2010-01-19) on 2010-01-20. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2010-01-19)"}}