{"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":"137.35.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/137.35.0.0-137.35.255.255/","statistics_now":{"registry":"ARIN","status":"reserved"},"current_holder":{"rir":"ARIN","org":null,"how":"ARIN's latest statistics"},"rdap_snapshots":[],"transfers":[],"events":[{"event_id":"8562634aa13b97de","registry":"ARIN","report_date":"2019-10-01","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 137.35.0.0-137.35.255.255","resource_type":"ipv4","resource":"137.35.0.0/16","start":"137.35.0.0","end":"137.35.255.255","classification":"NO_MATERIAL_CHANGE","classification_label":"No substantive resource change found","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:37+00:00","page":"https://rirtracker.com/ip/137.35.0.0-137.35.255.255/#e-8562634aa13b97de","report_page":"https://rirtracker.com/arin/reports/2019-10-01/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/137.35.0.0-137.35.255.255.json","explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved).","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2019-October/003946.html","retrieved_at":"2026-10-12T18:40:39+00:00","summary":"ARIN-Issued report for 2019-10-01: \"Remove 137.35.0.0-137.35.255.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190930.gz","retrieved_at":"2026-10-12T22:12:02+00:00","summary":"ARIN delegated statistics 2019-09-30 (produced 2019-09-30T14:00:16+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20191002.gz","retrieved_at":"2026-10-12T22:12:07+00:00","summary":"ARIN delegated statistics 2019-10-02 (produced 2019-10-02T14:00:16+00:00), after the report: reserved"}]},{"event_id":"3ebce55a3c0b2442","registry":"ARIN","report_date":"2017-04-11","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"137.35.0.0/16","start":"137.35.0.0","end":"137.35.255.255","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":"2026-10-14T00:02:54+00:00","page":"https://rirtracker.com/ip/137.35.0.0-137.35.255.255/#e-3ebce55a3c0b2442","report_page":"https://rirtracker.com/arin/reports/2017-04-11/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/137.35.0.0-137.35.255.255.json","observed":"137.35.0.0/16 assigned on 2017-04-11, reserved on 2017-04-12","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":"2017-06-10","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 1989-10-17) on 2017-04-10 and reserved on 2017-04-12. 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 2017-06-10. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170412.gz","retrieved_at":"2026-10-12T21:26:26+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 137.35.0.0/16 assigned on 2017-04-11, reserved on 2017-04-12"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170410.gz","retrieved_at":"2026-10-12T21:26:21+00:00","summary":"ARIN delegated statistics 2017-04-10 (produced 2017-04-10T05:09:04+00:00), before the report: assigned (dated 1989-10-17)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2017/delegated-arin-extended-20170412.gz","retrieved_at":"2026-10-12T21:26:26+00:00","summary":"ARIN delegated statistics 2017-04-12 (produced 2017-04-12T05:10:43+00:00), after the report: reserved"}]}],"classification_history":{"8562634aa13b97de":[{"raw_change_id":161767,"classification_code":"NO_MATERIAL_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:45:51+00:00","current":0,"public_explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved)."},{"raw_change_id":161767,"classification_code":"NO_MATERIAL_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:38+00:00","current":0,"public_explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved)."},{"raw_change_id":161767,"classification_code":"NO_MATERIAL_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:21+00:00","current":0,"public_explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved)."},{"raw_change_id":161767,"classification_code":"NO_MATERIAL_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:37+00:00","current":1,"public_explanation":"ARIN-Issued lists it as \"Remove\", but ARIN's statistics show the same record before and after (reserved)."}],"3ebce55a3c0b2442":[{"raw_change_id":332097,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T05:10:31+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 1989-10-17) on 2017-04-10 and reserved on 2017-04-12. 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 2017-06-10. This does not confirm availability."},{"raw_change_id":332097,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:15:17+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 1989-10-17) on 2017-04-10 and reserved on 2017-04-12. 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 2017-06-10. This does not confirm availability."},{"raw_change_id":332097,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:58:47+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 1989-10-17) on 2017-04-10 and reserved on 2017-04-12. 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 2017-06-10. This does not confirm availability."},{"raw_change_id":332097,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:02:54+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 1989-10-17) on 2017-04-10 and reserved on 2017-04-12. 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 2017-06-10. This does not confirm availability."}]},"arin_statistics_now":{"status":"reserved"}}