{"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":"158.51.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/158.51.0.0-158.51.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (99 records, dated 2020-01-03 to 2026-10-30), reserved (1 record)"},"current_holder":{"rir":null,"org":null,"how":null},"rdap_snapshots":[],"transfers":[{"id":134441,"date":"2026-10-30T21:54:17Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Crossroads Broadband of Indiana, Inc","recipient_org":"Tekion","range":"158.51.155.0/24","log":"ARIN"},{"id":45351,"date":"2026-08-28T18:49:34Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"VURGE INC.","recipient_org":"ARROW DATACENTERS INC","range":"158.51.50.0/23","log":"ARIN"},{"id":45128,"date":"2026-08-14T18:12:05Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Internet Company Limited Partnership","recipient_org":"ARROW DATACENTERS INC","range":"158.51.0.0/23","log":"ARIN"},{"id":41905,"date":"2025-10-30T16:37:50Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Area 1 Security, Inc.","recipient_org":"Cloudflare, Inc.","range":"158.51.64.0/23","log":"ARIN"},{"id":41085,"date":"2025-08-11T18:49:02Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"TNEXT Communication Inc","recipient_org":"TechMinds Enterprise Inc.","range":"158.51.72.0/22","log":"ARIN"},{"id":40605,"date":"2025-06-12T17:48:32Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Internet Company Limited Partnership","recipient_org":"The Internet Company Limited Partnership","range":"158.51.0.0/23","log":"ARIN"},{"id":39799,"date":"2025-03-26T11:59:50Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Celerity Networks LLC","recipient_org":"Gallatin Wireless Internet, LLC","range":"158.51.4.0/22","log":"ARIN"},{"id":37202,"date":"2024-11-18T20:33:55Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Pumpkin Networks, LLC","recipient_org":"Another Corporate ISP, LLC","range":"158.51.80.0/22","log":"ARIN"},{"id":35365,"date":"2024-04-29T14:04:30Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"HC Technologies, LLC","recipient_org":"GTS Securities, LLC","range":"158.51.196.0/23","log":"ARIN"},{"id":35234,"date":"2024-04-11T17:54:17Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Sureline Telecom","recipient_org":"Gorge Networks Inc.","range":"158.51.138.0/23","log":"ARIN"},{"id":32779,"date":"2023-08-22T22:47:04Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Redbird Communications Inc","recipient_org":"FlexNetworks","range":"158.51.52.0/22","log":"ARIN"},{"id":32652,"date":"2023-08-08T15:27:06Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Fastnet Communications","recipient_org":"FlexNetworks","range":"158.51.244.0/22","log":"ARIN"},{"id":31882,"date":"2023-05-09T17:05:21Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Gemalto, Inc.","recipient_org":"Thales DIS USA, Inc.","range":"158.51.232.0/22","log":"ARIN"},{"id":26601,"date":"2022-01-06T19:59:44Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"HAUG COMMUNICATIONS","recipient_org":"KwiKom Communications","range":"158.51.164.0/22","log":"ARIN"},{"id":26534,"date":"2021-12-27T20:52:56Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"GBTCloud Inc","recipient_org":"QuickPacket, LLC","range":"158.51.144.0/22","log":"ARIN"},{"id":24192,"date":"2021-03-26T14:49:43Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"COMMON NETWORKS, INC.","recipient_org":"Pumpkin Networks, LLC","range":"158.51.80.0/22","log":"ARIN"}],"events":[{"event_id":"726cf9b132fce7f4","registry":"ARIN","report_date":"2011-08-17","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 158.51.0.0-158.51.255.255","resource_type":"ipv4","resource":"158.51.0.0/16","start":"158.51.0.0","end":"158.51.255.255","classification":"UNRESOLVED","classification_label":"Unresolved change","confidence":"OBSERVED_ONLY","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Inventory effect unknown","inventory_effect_code":"UNKNOWN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:55+00:00","page":"https://rirtracker.com/ip/158.51.0.0-158.51.255.255/#e-726cf9b132fce7f4","report_page":"https://rirtracker.com/arin/reports/2011-08-17/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/158.51.0.0-158.51.255.255.json","explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2011-August/000979.html","retrieved_at":"2026-10-12T18:37:12+00:00","summary":"ARIN-Issued report for 2011-08-17: \"Remove 158.51.0.0-158.51.255.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110816.gz","retrieved_at":"2026-10-12T19:24:02+00:00","summary":"ARIN delegated statistics 2011-08-16, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110818.gz","retrieved_at":"2026-10-12T19:24:07+00:00","summary":"ARIN delegated statistics 2011-08-18, after the report: not issued"}]},{"event_id":"e8315dbccd5299e7","registry":"ARIN","report_date":"2011-02-07","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"158.51.0.0/16","start":"158.51.0.0","end":"158.51.255.255","classification":"REMOVED_REASON_UNKNOWN","classification_label":"Removed (return, revocation or reclamation not publicly distinguishable)","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Possible future reissue candidate after hold","inventory_effect_code":"HOLD_CANDIDATE","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:17+00:00","page":"https://rirtracker.com/ip/158.51.0.0-158.51.255.255/#e-e8315dbccd5299e7","report_page":"https://rirtracker.com/arin/reports/2011-02-07/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/158.51.0.0-158.51.255.255.json","observed":"158.51.0.0/16 assigned on 2011-02-07, not listed on 2011-02-08","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_days":60,"estimated_hold_end":"2011-04-08","availability_statement":"Possible reissue candidate after this date; not confirmed available"},"explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2011-04-08. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110208.gz","retrieved_at":"2026-10-12T19:16:12+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 158.51.0.0/16 assigned on 2011-02-07, not listed on 2011-02-08"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110206.gz","retrieved_at":"2026-10-12T19:16:08+00:00","summary":"ARIN delegated statistics 2011-02-06, before the report: assigned (dated 1992-02-14)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20110208.gz","retrieved_at":"2026-10-12T19:16:12+00:00","summary":"ARIN delegated statistics 2011-02-08, after the report: not issued"}]}],"classification_history":{"726cf9b132fce7f4":[{"raw_change_id":124222,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T03:14:44+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed."},{"raw_change_id":124222,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:21+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed."},{"raw_change_id":124222,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:55+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed."},{"raw_change_id":124222,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:55+00:00","current":1,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed."}],"e8315dbccd5299e7":[{"raw_change_id":225991,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:18:50+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2011-04-08. This does not confirm availability."},{"raw_change_id":225991,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:09:34+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2011-04-08. This does not confirm availability."},{"raw_change_id":225991,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:52:36+00:00","current":0,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the earliest estimated hold expiration is 2011-04-08. This does not confirm availability."},{"raw_change_id":225991,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:17+00:00","current":1,"public_explanation":"Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2011-04-08. This does not confirm availability."}]},"arin_statistics_now":{"status":"allocated (99 records, dated 2020-01-03 to 2026-10-30), reserved (1 record)"}}