{"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":"37.16.0.0/19","resource_type":"ipv4","page":"https://rirtracker.com/ip/37.16.0.0-37.16.31.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2021-12-21)"},"current_holder":{"rir":"ARIN","org":"Fly.io, Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":84608,"date":"2021-12-21T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_org":"Mijndomein Hosting B.V.","recipient_org":null,"range":"37.16.0.0/19","log":"RIPE NCC"},{"id":26472,"date":"2021-12-21T14:56:42Z","type":"RESOURCE_TRANSFER","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_org":"Mijndomein Hosting B.V.","recipient_org":"Fly.io, Inc.","range":"37.16.0.0/19","log":"ARIN"}],"events":[{"event_id":"e3b5d39a36162607","registry":"ARIN","report_date":"2021-12-21","source":"arin_issued","raw_action":"ADD","raw_line":"Add 37.16.0.0-37.16.31.255","resource_type":"ipv4","resource":"37.16.0.0/19","start":"37.16.0.0","end":"37.16.31.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into ARIN","confidence":"CONFIRMED","source_rir":"RIPE NCC","recipient_rir":"ARIN","source_organization":"Mijndomein Hosting B.V.","recipient_organization":"Fly.io, Inc.","inventory_effect":"Transferred into ARIN administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:18+00:00","page":"https://rirtracker.com/ip/37.16.0.0-37.16.31.255/#e-e3b5d39a36162607","report_page":"https://rirtracker.com/arin/reports/2021-12-21/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/37.16.0.0-37.16.31.255.json","same_transfer_as":"5ac34a83d87a1da4","explanation":"ARIN's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN) on 2021-12-21 14:56 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/2021-December/004757.html","retrieved_at":"2026-10-12T18:41:34+00:00","summary":"ARIN-Issued report for 2021-12-21: \"Add 37.16.0.0-37.16.31.255\""},{"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 2021-12-21 14:56 UTC, Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN); resources moved: 37.16.0.0/19"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20211220.gz","retrieved_at":"2026-10-12T22:54:05+00:00","summary":"ARIN delegated statistics 2021-12-20 (produced 2021-12-20T14:00:13+00:00), before the report: not listed"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20211222.gz","retrieved_at":"2026-10-12T22:54:10+00:00","summary":"ARIN delegated statistics 2021-12-22 (produced 2021-12-22T14:00:13+00:00), after the report: allocated (dated 2021-12-21)"}]},{"event_id":"5ac34a83d87a1da4","registry":"RIPE NCC","report_date":"2021-12-21","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"37.16.0.0/19","start":"37.16.0.0","end":"37.16.31.255","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":"Mijndomein Hosting B.V.","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":"2026-10-13T23:48:56+00:00","page":"https://rirtracker.com/ip/37.16.0.0-37.16.31.255/#e-5ac34a83d87a1da4","report_page":"https://rirtracker.com/ripe/reports/2021-12-21/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/37.16.0.0-37.16.31.255.json","observed":"Transfer: Mijndomein Hosting B.V. (RIPE NCC) to (no name) (ARIN)","same_transfer_as":"e3b5d39a36162607","explanation":"The RIPE NCC's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to an unnamed organization (ARIN) on 2021-12-21 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 2021-12-21 19:00 UTC, Mijndomein Hosting B.V. (RIPE NCC) to (no name) (ARIN); resources moved: 37.16.0.0/19"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2021/delegated-ripencc-extended-20211220.bz2","retrieved_at":"2026-10-12T23:23:58+00:00","summary":"RIPE NCC delegated statistics 2021-12-20 (produced 2021-12-20T22:59:00+00:00), before the change: allocated (dated 2011-12-16)"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2021/delegated-ripencc-extended-20211221.bz2","retrieved_at":"2026-10-12T23:24:21+00:00","summary":"RIPE NCC delegated statistics 2021-12-21 (produced 2021-12-21T22:59:00+00:00), after the change: not listed"}]},{"event_id":"84a42b38ad882979","registry":"RIPE NCC","report_date":"2011-12-16","source":"statistics","raw_action":"ADDED","raw_line":null,"resource_type":"ipv4","resource":"37.16.0.0/19","start":"37.16.0.0","end":"37.16.31.255","classification":"APPARENT_REISSUANCE","classification_label":"Apparent reissuance of previously removed resource","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from RIPE NCC-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:55:55+00:00","page":"https://rirtracker.com/ip/37.16.0.0-37.16.31.255/#e-84a42b38ad882979","report_page":"https://rirtracker.com/ripe/reports/2011-12-16/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/37.16.0.0-37.16.31.255.json","observed":"37.16.0.0/19 available on 2011-12-15, allocated on 2011-12-16","explanation":"No transfer record matches. The RIPE NCC's statistics show it available on 2011-12-15 and allocated (dated 2011-12-16) on 2011-12-16. The tracker saw this range removed from registration on 2011-07-06 (37.0.0.0/10), so it appears to have been issued again from the RIPE NCC's pool.","evidence":[{"type":"statistics_diff","url":"https://ftp.ripe.net/pub/stats/ripencc/2011/delegated-ripencc-extended-20111216.bz2","retrieved_at":"2026-10-12T19:08:14+00:00","summary":"Found by comparing the RIPE NCC's daily statistics: 37.16.0.0/19 available on 2011-12-15, allocated on 2011-12-16"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2011/delegated-ripencc-extended-20111215.bz2","retrieved_at":"2026-10-12T19:08:11+00:00","summary":"RIPE NCC delegated statistics 2011-12-15 (produced 2011-12-15T22:59:59+00:00), before the change: available"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2011/delegated-ripencc-extended-20111216.bz2","retrieved_at":"2026-10-12T19:08:14+00:00","summary":"RIPE NCC delegated statistics 2011-12-16 (produced 2011-12-16T22:59:59+00:00), after the change: allocated (dated 2011-12-16)"}]}],"classification_history":{"e3b5d39a36162607":[{"raw_change_id":174479,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:54:35+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN) on 2021-12-21 14:56 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":174479,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:09+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN) on 2021-12-21 14:56 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":174479,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:57+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN) on 2021-12-21 14:56 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":174479,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:18+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to Fly.io, Inc. (ARIN) on 2021-12-21 14:56 UTC: it came to ARIN from the RIPE NCC. It was already issued by another registry, so this is not a new issuance."}],"5ac34a83d87a1da4":[{"raw_change_id":84846,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:56:18+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to an unnamed organization (ARIN) on 2021-12-21 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":84846,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:03:48+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to an unnamed organization (ARIN) on 2021-12-21 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":84846,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:46:11+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to an unnamed organization (ARIN) on 2021-12-21 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":84846,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:48:56+00:00","current":1,"public_explanation":"The RIPE NCC's transfer log records a transfer from Mijndomein Hosting B.V. (RIPE NCC) to an unnamed organization (ARIN) on 2021-12-21 19:00 UTC: it left the RIPE NCC for ARIN. It is not a new allocation and is not offered to RIPE NCC applicants."}],"84a42b38ad882979":[{"raw_change_id":219783,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:16:32+00:00","current":0,"public_explanation":"No transfer record matches. The RIPE NCC's statistics show it available on 2011-12-15 and allocated (dated 2011-12-16) on 2011-12-16. The tracker saw this range removed from registration on 2011-07-06 (37.0.0.0/10), so it appears to have been issued again from the RIPE NCC's pool."},{"raw_change_id":219783,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:09:15+00:00","current":0,"public_explanation":"No transfer record matches. The RIPE NCC's statistics show it available on 2011-12-15 and allocated (dated 2011-12-16) on 2011-12-16. The tracker saw this range removed from registration on 2011-07-06 (37.0.0.0/10), so it appears to have been issued again from the RIPE NCC's pool."},{"raw_change_id":219783,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:52:16+00:00","current":0,"public_explanation":"No transfer record matches. The RIPE NCC's statistics show it available on 2011-12-15 and allocated (dated 2011-12-16) on 2011-12-16. The tracker saw this range removed from registration on 2011-07-06 (37.0.0.0/10), so it appears to have been issued again from the RIPE NCC's pool."},{"raw_change_id":219783,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:55:55+00:00","current":1,"public_explanation":"No transfer record matches. The RIPE NCC's statistics show it available on 2011-12-15 and allocated (dated 2011-12-16) on 2011-12-16. The tracker saw this range removed from registration on 2011-07-06 (37.0.0.0/10), so it appears to have been issued again from the RIPE NCC's pool."}]},"arin_statistics_now":{"status":"allocated (dated 2021-12-21)"}}