{"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":"51.81.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/51.81.0.0-51.81.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2019-03-11)"},"current_holder":{"rir":"ARIN","org":"OVH US LLC","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":63013,"date":"2019-03-11T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_org":"OVH SAS","recipient_org":null,"range":"51.81.0.0/16","log":"RIPE NCC"},{"id":17088,"date":"2019-03-11T15:03:07Z","type":"RESOURCE_TRANSFER","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_org":"OVH SAS","recipient_org":"OVH US LLC","range":"51.81.0.0/16","log":"ARIN"}],"events":[{"event_id":"d44a5ab1d1712e85","registry":"ARIN","report_date":"2019-03-11","source":"arin_issued","raw_action":"ADD","raw_line":"Add 51.81.0.0-51.81.255.255","resource_type":"ipv4","resource":"51.81.0.0/16","start":"51.81.0.0","end":"51.81.255.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into ARIN","confidence":"CONFIRMED","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_organization":"OVH SAS","recipient_organization":"OVH US LLC","inventory_effect":"Transferred into ARIN administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:27+00:00","page":"https://rirtracker.com/ip/51.81.0.0-51.81.255.255/#e-d44a5ab1d1712e85","report_page":"https://rirtracker.com/arin/reports/2019-03-11/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/51.81.0.0-51.81.255.255.json","same_transfer_as":"7e7eaa1ac761eacb","explanation":"ARIN's transfer log records a transfer from OVH SAS (RIPE NCC) to OVH US LLC (ARIN) on 2019-03-11 15:03 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2019-March/003743.html","retrieved_at":"2026-10-12T18:40:24+00:00","summary":"ARIN-Issued report for 2019-03-11: \"Add 51.81.0.0-51.81.255.255\""},{"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: RESOURCE_TRANSFER on 2019-03-11 15:03 UTC, OVH SAS (RIPE NCC) to OVH US LLC (ARIN); resources moved: 51.81.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190310.gz","retrieved_at":"2026-10-12T22:01:36+00:00","summary":"ARIN delegated statistics 2019-03-10 (produced 2019-03-10T06:00:16+00:00), before the report: not listed"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190312.gz","retrieved_at":"2026-10-12T22:01:41+00:00","summary":"ARIN delegated statistics 2019-03-12 (produced 2019-03-12T05:00:17+00:00), after the report: allocated (dated 2019-03-11)"}]},{"event_id":"7e7eaa1ac761eacb","registry":"RIPE NCC","report_date":"2019-03-11","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"51.81.0.0/16","start":"51.81.0.0","end":"51.81.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of the RIPE NCC","confidence":"CONFIRMED","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_organization":"OVH SAS","recipient_organization":null,"inventory_effect":"Transferred out of RIPE NCC administration; not offered to RIPE NCC applicants","inventory_effect_code":"TRANSFER_OUT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:47:49+00:00","page":"https://rirtracker.com/ip/51.81.0.0-51.81.255.255/#e-7e7eaa1ac761eacb","report_page":"https://rirtracker.com/ripe/reports/2019-03-11/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/51.81.0.0-51.81.255.255.json","observed":"Transfer: OVH SAS (RIPE NCC) to (no name) (ARIN)","same_transfer_as":"d44a5ab1d1712e85","explanation":"The RIPE NCC's transfer log records a transfer from OVH SAS (RIPE NCC) to an unnamed organization (ARIN) on 2019-03-11 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants.","evidence":[{"type":"transfer","url":"https://ftp.ripe.net/pub/stats/ripencc/transfers/transfers_latest.json","retrieved_at":"2026-10-13T21:49:37+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2019-03-11 19:00 UTC, OVH SAS (RIPE NCC) to (no name) (ARIN); resources moved: 51.81.0.0/16"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2019/delegated-ripencc-extended-20190310.bz2","retrieved_at":"2026-10-12T22:05:50+00:00","summary":"RIPE NCC delegated statistics 2019-03-10 (produced 2019-03-10T22:59:59+00:00), before the change: assigned (dated 1993-09-01)"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2019/delegated-ripencc-extended-20190311.bz2","retrieved_at":"2026-10-12T22:05:53+00:00","summary":"RIPE NCC delegated statistics 2019-03-11 (produced 2019-03-11T22:59:59+00:00), after the change: not listed"}]}],"classification_history":{"d44a5ab1d1712e85":[{"raw_change_id":158936,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:43:49+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from OVH SAS (RIPE NCC) to OVH US LLC (ARIN) on 2019-03-11 15:03 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":158936,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:30+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from OVH SAS (RIPE NCC) to OVH US LLC (ARIN) on 2019-03-11 15:03 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":158936,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:13+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from OVH SAS (RIPE NCC) to OVH US LLC (ARIN) on 2019-03-11 15:03 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":158936,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:27+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from OVH SAS (RIPE NCC) to OVH US LLC (ARIN) on 2019-03-11 15:03 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance."}],"7e7eaa1ac761eacb":[{"raw_change_id":62535,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:46:58+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from OVH SAS (RIPE NCC) to an unnamed organization (ARIN) on 2019-03-11 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants."},{"raw_change_id":62535,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:02:53+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from OVH SAS (RIPE NCC) to an unnamed organization (ARIN) on 2019-03-11 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants."},{"raw_change_id":62535,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:45:09+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from OVH SAS (RIPE NCC) to an unnamed organization (ARIN) on 2019-03-11 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants."},{"raw_change_id":62535,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:47:49+00:00","current":1,"public_explanation":"The RIPE NCC's transfer log records a transfer from OVH SAS (RIPE NCC) to an unnamed organization (ARIN) on 2019-03-11 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants."}]},"arin_statistics_now":{"status":"allocated (dated 2019-03-11)"}}