{"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":"158.23.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/158.23.0.0-158.23.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 1992-02-07)"},"current_holder":{"rir":"APNIC","org":"Microsoft Singapore Pte. Ltd.","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":27868,"date":"2022-04-28T10:47:27Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"Exxon Mobil Corporation","recipient_org":"Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP]","range":"158.23.0.0/16","log":"ARIN"},{"id":127920,"date":"2022-04-28T07:06:12Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"EMC-55","recipient_org":"Microsoft Singapore Pte. Ltd.","range":"158.23.0.0/16","log":"APNIC"}],"events":[{"event_id":"b6f709652316ff5a","registry":"APNIC","report_date":"2022-04-28","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"158.23.0.0/16","start":"158.23.0.0","end":"158.23.255.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into APNIC","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"EMC-55","recipient_organization":"Microsoft Singapore Pte. Ltd.","inventory_effect":"Transferred into APNIC administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:45+00:00","page":"https://rirtracker.com/ip/158.23.0.0-158.23.255.255/#e-b6f709652316ff5a","report_page":"https://rirtracker.com/apnic/reports/2022-04-28/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/158.23.0.0-158.23.255.255.json","observed":"Transfer: EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC)","same_transfer_as":"43a5cc69cfd34745","explanation":"APNIC's transfer log records a transfer from EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2022-04-28 07:06 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 2022-04-28 07:06 UTC, EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC); resources moved: 158.23.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20220428.gz","retrieved_at":"2026-10-13T00:11:13+00:00","summary":"APNIC delegated statistics 2022-04-28, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2022/delegated-apnic-extended-20220429.gz","retrieved_at":"2026-10-13T00:11:17+00:00","summary":"APNIC delegated statistics 2022-04-29, after the change: allocated (dated 1992-02-07)"}]},{"event_id":"43a5cc69cfd34745","registry":"ARIN","report_date":"2022-04-27","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"158.23.0.0/16","start":"158.23.0.0","end":"158.23.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"Exxon Mobil Corporation","recipient_organization":"Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP]","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":"2026-10-14T00:09:14+00:00","page":"https://rirtracker.com/ip/158.23.0.0-158.23.255.255/#e-43a5cc69cfd34745","report_page":"https://rirtracker.com/arin/reports/2022-04-27/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/158.23.0.0-158.23.255.255.json","observed":"158.23.0.0/16 allocated on 2022-04-27, not listed on 2022-04-28","same_transfer_as":"b6f709652316ff5a","explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC) on 2022-04-28 10:47 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/2022/delegated-arin-extended-20220428.gz","retrieved_at":"2026-10-12T23:00:36+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 158.23.0.0/16 allocated on 2022-04-27, not listed on 2022-04-28"},{"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 2022-04-28 10:47 UTC, Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC); resources moved: 158.23.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2022/delegated-arin-extended-20220426.gz","retrieved_at":"2026-10-12T23:00:31+00:00","summary":"ARIN delegated statistics 2022-04-26 (produced 2022-04-26T13:00:09+00:00), before the report: allocated (dated 1992-02-07)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2022/delegated-arin-extended-20220428.gz","retrieved_at":"2026-10-12T23:00:36+00:00","summary":"ARIN delegated statistics 2022-04-28 (produced 2022-04-28T13:00:10+00:00), after the report: not listed"}]}],"classification_history":{"b6f709652316ff5a":[{"raw_change_id":38739,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:37:12+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2022-04-28 07:06 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":38739,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:59+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2022-04-28 07:06 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":38739,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:09+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2022-04-28 07:06 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":38739,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:45+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from EMC-55 (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2022-04-28 07:06 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."}],"43a5cc69cfd34745":[{"raw_change_id":427221,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T05:51:03+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC) on 2022-04-28 10:47 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":427221,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:20:31+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC) on 2022-04-28 10:47 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":427221,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:04:25+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC) on 2022-04-28 10:47 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":427221,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:09:14+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Singapore Pte. Ltd. [MICROSOFT-APNIC-AP] (APNIC) on 2022-04-28 10:47 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."}]},"arin_statistics_now":{"status":"not listed"}}