{"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":"104.251.144.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/104.251.144.0-104.251.159.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2014-12-22)"},"current_holder":{"rir":"APNIC","org":"Cable Television Saiki Co., Ltd. ","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":12897,"date":"2018-04-16T12:45:45Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"DOT COM SOLUTIONS, INC","recipient_org":"Cable Television Saiki Co., Ltd. ","range":"104.251.144.0/20","log":"ARIN"},{"id":125731,"date":"2018-04-16T05:46:36Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"DOTCO-8","recipient_org":"Japan Network Information Center/CTS","range":"104.251.144.0/20","log":"APNIC"}],"events":[{"event_id":"318782af30e554cb","registry":"ARIN","report_date":"2018-04-16","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"104.251.144.0/20","start":"104.251.144.0","end":"104.251.159.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"DOT COM SOLUTIONS, INC","recipient_organization":"Cable Television Saiki Co., Ltd. ","inventory_effect":"Transferred out of ARIN administration; not offered to ARIN applicants","inventory_effect_code":"TRANSFER_OUT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:04:13+00:00","page":"https://rirtracker.com/ip/104.251.144.0-104.251.159.255/#e-318782af30e554cb","report_page":"https://rirtracker.com/arin/reports/2018-04-16/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/104.251.144.0-104.251.159.255.json","observed":"104.251.144.0/20 allocated on 2018-04-16, not listed on 2018-04-17","same_transfer_as":"41cf661d23e438a2","explanation":"ARIN's transfer log records a transfer from DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC) on 2018-04-16 12:45 UTC: it left ARIN for APNIC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180417.gz","retrieved_at":"2026-10-12T21:44:53+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 104.251.144.0/20 allocated on 2018-04-16, not listed on 2018-04-17"},{"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 2018-04-16 12:45 UTC, DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC); resources moved: 104.251.144.0/20"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180415.gz","retrieved_at":"2026-10-12T21:44:48+00:00","summary":"ARIN delegated statistics 2018-04-15 (produced 2018-04-15T05:10:04+00:00), before the report: allocated (dated 2014-12-22)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180417.gz","retrieved_at":"2026-10-12T21:44:53+00:00","summary":"ARIN delegated statistics 2018-04-17 (produced 2018-04-17T05:10:48+00:00), after the report: not listed"}]},{"event_id":"41cf661d23e438a2","registry":"APNIC","report_date":"2018-04-16","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"104.251.144.0/20","start":"104.251.144.0","end":"104.251.159.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into APNIC","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"DOTCO-8","recipient_organization":"Japan Network Information Center/CTS","inventory_effect":"Transferred into APNIC administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:36+00:00","page":"https://rirtracker.com/ip/104.251.144.0-104.251.159.255/#e-41cf661d23e438a2","report_page":"https://rirtracker.com/apnic/reports/2018-04-16/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/104.251.144.0-104.251.159.255.json","observed":"Transfer: DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC)","same_transfer_as":"318782af30e554cb","explanation":"APNIC's transfer log records a transfer from DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC) on 2018-04-16 05:46 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance.","evidence":[{"type":"transfer","url":"https://ftp.apnic.net/stats/apnic/transfers/transfers_latest.json","retrieved_at":"2026-10-13T18:17:16+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2018-04-16 05:46 UTC, DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC); resources moved: 104.251.144.0/20"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180416.gz","retrieved_at":"2026-10-12T22:26:22+00:00","summary":"APNIC delegated statistics 2018-04-16, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2018/delegated-apnic-extended-20180417.gz","retrieved_at":"2026-10-12T22:26:26+00:00","summary":"APNIC delegated statistics 2018-04-17, after the change: allocated (dated 2014-12-22)"}]},{"event_id":"f3dd50d820b14c90","registry":"ARIN","report_date":"2016-05-10","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"104.251.144.0/20","start":"104.251.144.0","end":"104.251.159.255","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":"2026-10-14T00:01:57+00:00","page":"https://rirtracker.com/ip/104.251.144.0-104.251.159.255/#e-f3dd50d820b14c90","report_page":"https://rirtracker.com/arin/reports/2016-05-10/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/104.251.144.0-104.251.159.255.json","observed":"104.251.144.0/20 allocated on 2016-05-10, reserved on 2016-05-11","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":"2016-07-09","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 allocated (dated 2014-12-22) on 2016-05-09 and reserved on 2016-05-11. 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 2016-07-09. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160511.gz","retrieved_at":"2026-10-12T21:10:11+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 104.251.144.0/20 allocated on 2016-05-10, reserved on 2016-05-11"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160509.gz","retrieved_at":"2026-10-12T21:10:06+00:00","summary":"ARIN delegated statistics 2016-05-09 (produced 2016-05-09T05:05:03+00:00), before the report: allocated (dated 2014-12-22)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160511.gz","retrieved_at":"2026-10-12T21:10:11+00:00","summary":"ARIN delegated statistics 2016-05-11 (produced 2016-05-11T05:05:06+00:00), after the report: reserved"}]},{"event_id":"8642b5b4f370c7f0","registry":"ARIN","report_date":"2014-12-22","source":"arin_issued","raw_action":"ADD","raw_line":"Add 104.251.144.0-104.251.159.255","resource_type":"ipv4","resource":"104.251.144.0/20","start":"104.251.144.0","end":"104.251.159.255","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":"2026-10-13T23:51:17+00:00","page":"https://rirtracker.com/ip/104.251.144.0-104.251.159.255/#e-8642b5b4f370c7f0","report_page":"https://rirtracker.com/arin/reports/2014-12-22/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/104.251.144.0-104.251.159.255.json","explanation":"No transfer record matches. ARIN's statistics show it available on 2014-12-21 and allocated (dated 2014-12-22) on 2014-12-23. 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/2014-December/002203.html","retrieved_at":"2026-10-12T18:38:37+00:00","summary":"ARIN-Issued report for 2014-12-22: \"Add 104.251.144.0-104.251.159.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2014/delegated-arin-extended-20141221.gz","retrieved_at":"2026-10-12T20:45:39+00:00","summary":"ARIN delegated statistics 2014-12-21 (produced 2014-12-21T06:04:21+00:00), before the report: available"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2014/delegated-arin-extended-20141223.gz","retrieved_at":"2026-10-12T20:45:44+00:00","summary":"ARIN delegated statistics 2014-12-23 (produced 2014-12-23T06:04:03+00:00), after the report: allocated (dated 2014-12-22)"}]}],"classification_history":{"318782af30e554cb":[{"raw_change_id":352731,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T05:20:50+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC) on 2018-04-16 12:45 UTC: it left ARIN for APNIC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":352731,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:16:23+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC) on 2018-04-16 12:45 UTC: it left ARIN for APNIC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":352731,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:59:58+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC) on 2018-04-16 12:45 UTC: it left ARIN for APNIC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":352731,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:04:13+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from DOT COM SOLUTIONS, INC (ARIN) to Cable Television Saiki Co., Ltd.  (APNIC) on 2018-04-16 12:45 UTC: it left ARIN for APNIC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."}],"41cf661d23e438a2":[{"raw_change_id":35264,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:35:43+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC) on 2018-04-16 05:46 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35264,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:52+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC) on 2018-04-16 05:46 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35264,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:02+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC) on 2018-04-16 05:46 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35264,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:36+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from DOTCO-8 (ARIN) to Japan Network Information Center/CTS (APNIC) on 2018-04-16 05:46 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."}],"f3dd50d820b14c90":[{"raw_change_id":317393,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T05:03:38+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 allocated (dated 2014-12-22) on 2016-05-09 and reserved on 2016-05-11. 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 2016-07-09. This does not confirm availability."},{"raw_change_id":317393,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:14:28+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 allocated (dated 2014-12-22) on 2016-05-09 and reserved on 2016-05-11. 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 2016-07-09. This does not confirm availability."},{"raw_change_id":317393,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:57:55+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 allocated (dated 2014-12-22) on 2016-05-09 and reserved on 2016-05-11. 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 2016-07-09. This does not confirm availability."},{"raw_change_id":317393,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:01:57+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 allocated (dated 2014-12-22) on 2016-05-09 and reserved on 2016-05-11. 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 2016-07-09. This does not confirm availability."}],"8642b5b4f370c7f0":[{"raw_change_id":135142,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:28:24+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2014-12-21 and allocated (dated 2014-12-22) on 2014-12-23. The tracker saw this range released from hold on 2011-06-06 (69.57.208.0-216.250.127.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":135142,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:38+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2014-12-21 and allocated (dated 2014-12-22) on 2014-12-23. The tracker saw this range released from hold on 2011-06-06 (69.57.208.0-216.250.127.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":135142,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:14+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2014-12-21 and allocated (dated 2014-12-22) on 2014-12-23. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":135142,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:17+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2014-12-21 and allocated (dated 2014-12-22) on 2014-12-23. 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":"not listed"}}