{"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":"209.128.224.0/19","resource_type":"ipv4","page":"https://rirtracker.com/ip/209.128.224.0-209.128.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2012-05-17)"},"current_holder":{"rir":"ARIN","org":"Parsons Corporation","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":12371,"date":"2018-02-21T14:35:17Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Secure Mission Solutions LLC","recipient_org":"Parsons Corporation","range":"209.128.224.0/19","log":"ARIN"}],"events":[{"event_id":"3e3e55a73ab11d77","registry":"ARIN","report_date":"2018-02-21","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"209.128.224.0/19","start":"209.128.224.0","end":"209.128.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Secure Mission Solutions LLC","recipient_organization":"Parsons Corporation","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:34+00:00","page":"https://rirtracker.com/ip/209.128.224.0-209.128.255.255/#e-3e3e55a73ab11d77","report_page":"https://rirtracker.com/arin/reports/2018-02-21/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/209.128.224.0-209.128.255.255.json","observed":"Merger/acquisition: Secure Mission Solutions LLC (ARIN) to Parsons Corporation (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Secure Mission Solutions LLC (ARIN) to Parsons Corporation (ARIN) on 2018-02-21 14:35 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.","evidence":[{"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: MERGER_ACQUISITION on 2018-02-21 14:35 UTC, Secure Mission Solutions LLC (ARIN) to Parsons Corporation (ARIN); resources moved: 209.128.224.0/19"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180220.gz","retrieved_at":"2026-10-12T21:42:09+00:00","summary":"ARIN delegated statistics 2018-02-20 (produced 2018-02-20T06:09:56+00:00), before the report: assigned (dated 2012-05-17)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180222.gz","retrieved_at":"2026-10-12T21:42:13+00:00","summary":"ARIN delegated statistics 2018-02-22 (produced 2018-02-22T06:09:51+00:00), after the report: assigned (dated 2012-05-17)"}]},{"event_id":"2204609a59816be1","registry":"ARIN","report_date":"2012-05-17","source":"arin_issued","raw_action":"ADD","raw_line":"Add 209.128.224.0-209.128.255.255","resource_type":"ipv4","resource":"209.128.224.0/19","start":"209.128.224.0","end":"209.128.255.255","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":"2026-10-13T23:50:59+00:00","page":"https://rirtracker.com/ip/209.128.224.0-209.128.255.255/#e-2204609a59816be1","report_page":"https://rirtracker.com/arin/reports/2012-05-17/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/209.128.224.0-209.128.255.255.json","explanation":"No transfer record matches. ARIN's statistics show it not issued on 2012-05-16 and assigned (dated 2012-05-17) on 2012-05-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2012-04-20 (209.128.224.0-209.128.255.255), so it appears to have been issued again from ARIN's pool.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2012-May/001253.html","retrieved_at":"2026-10-12T18:37:31+00:00","summary":"ARIN-Issued report for 2012-05-17: \"Add 209.128.224.0-209.128.255.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2012/delegated-arin-20120516.gz","retrieved_at":"2026-10-12T19:35:38+00:00","summary":"ARIN delegated statistics 2012-05-16, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2012/delegated-arin-20120518.gz","retrieved_at":"2026-10-12T19:35:46+00:00","summary":"ARIN delegated statistics 2012-05-18, after the report: assigned (dated 2012-05-17)"}]},{"event_id":"9d67193a910a25e0","registry":"ARIN","report_date":"2012-04-20","source":"arin_issued","raw_action":"REMOVE","raw_line":"Remove 209.128.224.0-209.128.255.255","resource_type":"ipv4","resource":"209.128.224.0/19","start":"209.128.224.0","end":"209.128.255.255","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":"2026-10-13T23:50:59+00:00","page":"https://rirtracker.com/ip/209.128.224.0-209.128.255.255/#e-9d67193a910a25e0","report_page":"https://rirtracker.com/arin/reports/2012-04-20/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/209.128.224.0-209.128.255.255.json","explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2012-04-19 and not issued on 2012-04-21. (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/2012-April/001226.html","retrieved_at":"2026-10-12T18:37:29+00:00","summary":"ARIN-Issued report for 2012-04-20: \"Remove 209.128.224.0-209.128.255.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2012/delegated-arin-20120419.gz","retrieved_at":"2026-10-12T19:34:29+00:00","summary":"ARIN delegated statistics 2012-04-19, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2012/delegated-arin-20120421.gz","retrieved_at":"2026-10-12T19:34:37+00:00","summary":"ARIN delegated statistics 2012-04-21, after the report: not issued"}]},{"event_id":"aa94be8269d57d76","registry":"ARIN","report_date":"2011-10-20","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"209.128.224.0/19","start":"209.128.224.0","end":"209.128.255.255","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":"2026-10-13T23:56:46+00:00","page":"https://rirtracker.com/ip/209.128.224.0-209.128.255.255/#e-aa94be8269d57d76","report_page":"https://rirtracker.com/arin/reports/2011-10-20/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/209.128.224.0-209.128.255.255.json","observed":"209.128.224.0/19 allocated on 2011-10-20, not listed on 2011-10-21","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":"2011-12-19","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 2001-03-14) on 2011-10-19 and not issued on 2011-10-21. (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 2011-12-19. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111021.gz","retrieved_at":"2026-10-12T19:26:44+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 209.128.224.0/19 allocated on 2011-10-20, not listed on 2011-10-21"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111019.gz","retrieved_at":"2026-10-12T19:26:36+00:00","summary":"ARIN delegated statistics 2011-10-19, before the report: allocated (dated 2001-03-14)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2011/delegated-arin-20111021.gz","retrieved_at":"2026-10-12T19:26:44+00:00","summary":"ARIN delegated statistics 2011-10-21, after the report: not issued"}]}],"classification_history":{"3e3e55a73ab11d77":[{"raw_change_id":554024,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:34+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Secure Mission Solutions LLC (ARIN) to Parsons Corporation (ARIN) on 2018-02-21 14:35 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it."}],"2204609a59816be1":[{"raw_change_id":126239,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:17:15+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2012-05-16 and assigned (dated 2012-05-17) on 2012-05-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2012-04-20 (209.128.224.0-209.128.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":126239,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:24+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2012-05-16 and assigned (dated 2012-05-17) on 2012-05-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2012-04-20 (209.128.224.0-209.128.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":126239,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:59+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2012-05-16 and assigned (dated 2012-05-17) on 2012-05-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2012-04-20 (209.128.224.0-209.128.255.255), so it appears to have been issued again from ARIN's pool."},{"raw_change_id":126239,"classification_code":"APPARENT_REISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:59+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2012-05-16 and assigned (dated 2012-05-17) on 2012-05-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range released from hold on 2012-04-20 (209.128.224.0-209.128.255.255), so it appears to have been issued again from ARIN's pool."}],"9d67193a910a25e0":[{"raw_change_id":126026,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.0","classified_at":"2026-10-13T03:16:58+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2012-04-19 and not issued on 2012-04-21. (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":126026,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:24+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2012-04-19 and not issued on 2012-04-21. (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":126026,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:58+00:00","current":0,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2012-04-19 and not issued on 2012-04-21. (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":126026,"classification_code":"UNRESOLVED","confidence":"OBSERVED_ONLY","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:59+00:00","current":1,"public_explanation":"ARIN-Issued says \"Remove\", but ARIN's statistics show it not issued on 2012-04-19 and not issued on 2012-04-21. (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."}],"aa94be8269d57d76":[{"raw_change_id":234265,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:22:06+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 2001-03-14) on 2011-10-19 and not issued on 2011-10-21. (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 2011-12-19. This does not confirm availability."},{"raw_change_id":234265,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:09:59+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 2001-03-14) on 2011-10-19 and not issued on 2011-10-21. (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 2011-12-19. This does not confirm availability."},{"raw_change_id":234265,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:53:04+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 2001-03-14) on 2011-10-19 and not issued on 2011-10-21. (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 2011-12-19. This does not confirm availability."},{"raw_change_id":234265,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:56:46+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 2001-03-14) on 2011-10-19 and not issued on 2011-10-21. (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 2011-12-19. This does not confirm availability."}]},"arin_statistics_now":{"status":"allocated (dated 2012-05-17)"}}