{"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":"161.199.157.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/161.199.157.0-161.199.157.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2025-04-03)"},"current_holder":{"rir":"ARIN","org":"ZenKey LLC","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":19971,"date":"2020-02-05T22:21:30Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"American United Life Insurance Company","recipient_org":"ZenKey LLC","range":"161.199.157.0/24","log":"ARIN"}],"events":[{"event_id":"28c5d839333223a1","registry":"ARIN","report_date":"2025-04-03","source":"arin_issued","raw_action":"ADD","raw_line":"Add 161.199.157.0-161.199.157.255","resource_type":"ipv4","resource":"161.199.157.0/24","start":"161.199.157.0","end":"161.199.157.255","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 ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:26+00:00","page":"https://rirtracker.com/ip/161.199.157.0-161.199.157.255/#e-28c5d839333223a1","report_page":"https://rirtracker.com/arin/reports/2025-04-03/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.199.157.0-161.199.157.255.json","explanation":"No transfer record matches. ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. The tracker saw this range removed from registration on 2023-07-10 (161.199.157.0/24), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2025-April/005955.html","retrieved_at":"2026-10-12T18:42:59+00:00","summary":"ARIN-Issued report for 2025-04-03: \"Add 161.199.157.0-161.199.157.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250402.gz","retrieved_at":"2026-10-12T23:57:21+00:00","summary":"ARIN delegated statistics 2025-04-02 (produced 2025-04-02T13:01:10+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250404.gz","retrieved_at":"2026-10-12T23:57:38+00:00","summary":"ARIN delegated statistics 2025-04-04 (produced 2025-04-04T13:01:09+00:00), after the report: allocated (dated 2025-04-03)"}]},{"event_id":"7724e57ea7c8dcb5","registry":"ARIN","report_date":"2025-04-03","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 161.199.157.0-161.199.157.255","resource_type":"ipv4","resource":"161.199.157.0/24","start":"161.199.157.0","end":"161.199.157.255","classification":"POOL_RECORD_CHANGE","classification_label":"Change to ARIN's own pool record","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Part of the issuance reported the same day","inventory_effect_code":"PAIRED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:26+00:00","page":"https://rirtracker.com/ip/161.199.157.0-161.199.157.255/#e-7724e57ea7c8dcb5","report_page":"https://rirtracker.com/arin/reports/2025-04-03/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.199.157.0-161.199.157.255.json","explanation":"ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 161.199.157.0-161.199.157.255. The issuance is explained on that line.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2025-April/005955.html","retrieved_at":"2026-10-12T18:42:59+00:00","summary":"ARIN-Issued report for 2025-04-03: \"Remove 161.199.157.0-161.199.157.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250402.gz","retrieved_at":"2026-10-12T23:57:21+00:00","summary":"ARIN delegated statistics 2025-04-02 (produced 2025-04-02T13:01:10+00:00), before the report: reserved"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250404.gz","retrieved_at":"2026-10-12T23:57:38+00:00","summary":"ARIN delegated statistics 2025-04-04 (produced 2025-04-04T13:01:09+00:00), after the report: allocated (dated 2025-04-03)"}]},{"event_id":"22dbd20e9dcf6b21","registry":"ARIN","report_date":"2023-07-10","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"161.199.157.0/24","start":"161.199.157.0","end":"161.199.157.255","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":"2026-10-14T00:10:50+00:00","page":"https://rirtracker.com/ip/161.199.157.0-161.199.157.255/#e-22dbd20e9dcf6b21","report_page":"https://rirtracker.com/arin/reports/2023-07-10/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.199.157.0-161.199.157.255.json","observed":"161.199.157.0/24 allocated on 2023-07-10, reserved on 2023-07-11","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":"2023-09-08","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 allocated (dated 2020-02-05) on 2023-07-09 and reserved on 2023-07-11. 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 2023-09-08. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230711.gz","retrieved_at":"2026-10-12T23:23:41+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 161.199.157.0/24 allocated on 2023-07-10, reserved on 2023-07-11"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230709.gz","retrieved_at":"2026-10-12T23:23:36+00:00","summary":"ARIN delegated statistics 2023-07-09 (produced 2023-07-09T13:00:12+00:00), before the report: allocated (dated 2020-02-05)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230711.gz","retrieved_at":"2026-10-12T23:23:41+00:00","summary":"ARIN delegated statistics 2023-07-11 (produced 2023-07-11T13:00:10+00:00), after the report: reserved"}]},{"event_id":"20c66283cd9529f8","registry":"ARIN","report_date":"2020-02-05","source":"arin_issued","raw_action":"ADD","raw_line":"Add 161.199.157.0-161.199.157.255","resource_type":"ipv4","resource":"161.199.157.0/24","start":"161.199.157.0","end":"161.199.157.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"American United Life Insurance Company","recipient_organization":"ZenKey LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:44+00:00","page":"https://rirtracker.com/ip/161.199.157.0-161.199.157.255/#e-20c66283cd9529f8","report_page":"https://rirtracker.com/arin/reports/2020-02-05/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.199.157.0-161.199.157.255.json","explanation":"ARIN's transfer log records a transfer from American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN) on 2020-02-05 22:21 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2020-February/004072.html","retrieved_at":"2026-10-12T18:40:48+00:00","summary":"ARIN-Issued report for 2020-02-05: \"Add 161.199.157.0-161.199.157.255\""},{"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 2020-02-05 22:21 UTC, American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN); resources moved: 161.199.157.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200204.gz","retrieved_at":"2026-10-12T22:18:39+00:00","summary":"ARIN delegated statistics 2020-02-04 (produced 2020-02-04T15:00:13+00:00), before the report: assigned (dated 1993-01-29)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200206.gz","retrieved_at":"2026-10-12T22:18:44+00:00","summary":"ARIN delegated statistics 2020-02-06 (produced 2020-02-06T15:00:13+00:00), after the report: allocated (dated 2020-02-05)"}]}],"classification_history":{"28c5d839333223a1":[{"raw_change_id":193505,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:06:21+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. The tracker saw this range removed from registration on 2023-07-10 (161.199.157.0/24), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":193505,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:59+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. The tracker saw this range removed from registration on 2023-07-10 (161.199.157.0/24), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":193505,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:53+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. The tracker saw this range removed from registration on 2023-07-10 (161.199.157.0/24), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":193505,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:26+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. The tracker saw this range removed from registration on 2023-07-10 (161.199.157.0/24), so it appears to have been issued again from ARIN's pool."}],"7724e57ea7c8dcb5":[{"raw_change_id":193437,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:06:17+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 161.199.157.0-161.199.157.255. The issuance is explained on that line."},{"raw_change_id":193437,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:59+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 161.199.157.0-161.199.157.255. The issuance is explained on that line."},{"raw_change_id":193437,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:53+00:00","current":0,"public_explanation":"ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 161.199.157.0-161.199.157.255. The issuance is explained on that line."},{"raw_change_id":193437,"classification_code":"POOL_RECORD_CHANGE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:54:26+00:00","current":1,"public_explanation":"ARIN's statistics show it reserved on 2025-04-02 and allocated (dated 2025-04-03) on 2025-04-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 161.199.157.0-161.199.157.255. The issuance is explained on that line."}],"22dbd20e9dcf6b21":[{"raw_change_id":450701,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T06:01:30+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 2020-02-05) on 2023-07-09 and reserved on 2023-07-11. 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 2023-09-08. This does not confirm availability."},{"raw_change_id":450701,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:21:51+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 2020-02-05) on 2023-07-09 and reserved on 2023-07-11. 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 2023-09-08. This does not confirm availability."},{"raw_change_id":450701,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T15:05:52+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 2020-02-05) on 2023-07-09 and reserved on 2023-07-11. 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 2023-09-08. This does not confirm availability."},{"raw_change_id":450701,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-14T00:10:50+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 2020-02-05) on 2023-07-09 and reserved on 2023-07-11. 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 2023-09-08. This does not confirm availability."}],"20c66283cd9529f8":[{"raw_change_id":163865,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:47:12+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN) on 2020-02-05 22:21 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":163865,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:43+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN) on 2020-02-05 22:21 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":163865,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:28+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN) on 2020-02-05 22:21 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":163865,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:44+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from American United Life Insurance Company (ARIN) to ZenKey LLC (ARIN) on 2020-02-05 22:21 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2025-04-03)"}}