{"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":"AS40729","resource_type":"asn","page":"https://rirtracker.com/asn/40729/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2013-08-06)"},"current_holder":{"rir":"ARIN","org":"AECOM","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":1659,"date":"2019-05-15T08:15:20Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"URS Energy & Construction, Inc.","recipient_org":"AECOM","range":"AS40729","log":"ARIN"}],"events":[{"event_id":"1f2449cd9fac3265","registry":"ARIN","report_date":"2019-05-15","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"asn","resource":"AS40729","start":40729,"end":40729,"classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"URS Energy & Construction, Inc.","recipient_organization":"AECOM","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:45+00:00","page":"https://rirtracker.com/asn/40729/#e-1f2449cd9fac3265","report_page":"https://rirtracker.com/arin/reports/2019-05-15/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/40729.json","observed":"Merger/acquisition: URS Energy & Construction, Inc. (ARIN) to AECOM (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from URS Energy & Construction, Inc. (ARIN) to AECOM (ARIN) on 2019-05-15 08:15 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 2019-05-15 08:15 UTC, URS Energy & Construction, Inc. (ARIN) to AECOM (ARIN); resources moved: AS40729"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190514.gz","retrieved_at":"2026-10-12T22:05:01+00:00","summary":"ARIN delegated statistics 2019-05-14 (produced 2019-05-14T05:00:14+00:00), before the report: assigned (dated 2013-08-06)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190516.gz","retrieved_at":"2026-10-12T22:05:06+00:00","summary":"ARIN delegated statistics 2019-05-16 (produced 2019-05-16T05:00:13+00:00), after the report: assigned (dated 2013-08-06)"}]},{"event_id":"8305f98257ba1823","registry":"ARIN","report_date":"2013-05-06","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS40729","start":40729,"end":40729,"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":"2026-10-13T23:58:07+00:00","page":"https://rirtracker.com/asn/40729/#e-8305f98257ba1823","report_page":"https://rirtracker.com/arin/reports/2013-05-06/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/40729.json","observed":"AS40729 assigned on 2013-05-06, reserved on 2013-05-07","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_months":6,"estimated_hold_end":"2013-11-06","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 2010-08-19) on 2013-05-05 and reserved on 2013-05-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2013-11-06. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130507.gz","retrieved_at":"2026-10-12T19:58:27+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS40729 assigned on 2013-05-06, reserved on 2013-05-07"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130505.gz","retrieved_at":"2026-10-12T19:58:22+00:00","summary":"ARIN delegated statistics 2013-05-05 (produced 2013-05-05T05:06:14+00:00), before the report: assigned (dated 2010-08-19)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2013/delegated-arin-extended-20130507.gz","retrieved_at":"2026-10-12T19:58:27+00:00","summary":"ARIN delegated statistics 2013-05-07 (produced 2013-05-07T05:05:12+00:00), after the report: reserved"}]},{"event_id":"165e754e6dd58b52","registry":"ARIN","report_date":"2009-08-13","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"asn","resource":"AS40729","start":40729,"end":40729,"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":"2026-10-13T23:55:17+00:00","page":"https://rirtracker.com/asn/40729/#e-165e754e6dd58b52","report_page":"https://rirtracker.com/arin/reports/2009-08-13/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/40729.json","observed":"AS40729 allocated on 2009-08-13, not listed on 2009-08-14","hold":{"hold_rule_source_url":"https://www.arin.net/resources/guide/request/#reissuing-returned-revoked-and-reclaimed-resources","hold_rule_months":6,"estimated_hold_end":"2010-02-13","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 2008-03-04) on 2009-08-12 and not issued on 2009-08-14. (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 ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2010-02-13. This does not confirm availability.","evidence":[{"type":"statistics_diff","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090814.gz","retrieved_at":"2026-10-12T18:53:57+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS40729 allocated on 2009-08-13, not listed on 2009-08-14"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090812.gz","retrieved_at":"2026-10-12T18:53:49+00:00","summary":"ARIN delegated statistics 2009-08-12, before the report: allocated (dated 2008-03-04)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090814.gz","retrieved_at":"2026-10-12T18:53:57+00:00","summary":"ARIN delegated statistics 2009-08-14, after the report: not issued"}]}],"classification_history":{"1f2449cd9fac3265":[{"raw_change_id":558663,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:45+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from URS Energy & Construction, Inc. (ARIN) to AECOM (ARIN) on 2019-05-15 08:15 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."}],"8305f98257ba1823":[{"raw_change_id":257869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:34:45+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 2010-08-19) on 2013-05-05 and reserved on 2013-05-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2013-11-06. This does not confirm availability."},{"raw_change_id":257869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:11:10+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 2010-08-19) on 2013-05-05 and reserved on 2013-05-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2013-11-06. This does not confirm availability."},{"raw_change_id":257869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:54:21+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 2010-08-19) on 2013-05-05 and reserved on 2013-05-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2013-11-06. This does not confirm availability."},{"raw_change_id":257869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:58:07+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 2010-08-19) on 2013-05-05 and reserved on 2013-05-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2013-11-06. This does not confirm availability."}],"165e754e6dd58b52":[{"raw_change_id":208869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T04:12:08+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 2008-03-04) on 2009-08-12 and not issued on 2009-08-14. (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 ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2010-02-13. This does not confirm availability."},{"raw_change_id":208869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:08:42+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 2008-03-04) on 2009-08-12 and not issued on 2009-08-14. (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 ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2010-02-13. This does not confirm availability."},{"raw_change_id":208869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:51:40+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 2008-03-04) on 2009-08-12 and not issued on 2009-08-14. (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 ASNs for 6 calendar months before reissuing them, so the earliest estimated hold expiration is 2010-02-13. This does not confirm availability."},{"raw_change_id":208869,"classification_code":"REMOVED_REASON_UNKNOWN","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:55:17+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 allocated (dated 2008-03-04) on 2009-08-12 and not issued on 2009-08-14. (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 ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2010-02-13. This does not confirm availability."}]},"arin_statistics_now":{"status":"assigned (dated 2013-08-06)"}}