{"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":"163.228.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/163.228.0.0-163.228.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 1992-09-02)"},"current_holder":{"rir":"APNIC","org":"China Internet Network Information Center/BLUECLOUD","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":127173,"date":"2021-03-23T02:54:26Z","type":"RESOURCE_TRANSFER","source_rir":"APNIC","recipient_rir":"APNIC","source_org":"Microsoft Singapore Pte. Ltd.","recipient_org":"China Internet Network Information Center/BLUECLOUD","range":"163.228.0.0/16","log":"APNIC"},{"id":17136,"date":"2019-03-19T16:29:23Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"GlassBridge Enterprises, Inc.","recipient_org":"Microsoft Singapore Pte. Ltd.","range":"163.228.0.0/16","log":"ARIN"},{"id":126079,"date":"2019-03-19T05:39:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"IMATIO","recipient_org":"Microsoft Singapore Pte. Ltd.","range":"163.228.0.0/16","log":"APNIC"}],"events":[{"event_id":"3e59a7d580ddb1fa","registry":"APNIC","report_date":"2021-03-23","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"163.228.0.0/16","start":"163.228.0.0","end":"163.228.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-APNIC transfer","confidence":"CONFIRMED","source_rir":"APNIC","recipient_rir":"APNIC","source_organization":"Microsoft Singapore Pte. Ltd.","recipient_organization":"China Internet Network Information Center/BLUECLOUD","inventory_effect":"No effect on APNIC applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:42+00:00","page":"https://rirtracker.com/ip/163.228.0.0-163.228.255.255/#e-3e59a7d580ddb1fa","report_page":"https://rirtracker.com/apnic/reports/2021-03-23/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.228.0.0-163.228.255.255.json","observed":"Transfer: Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC)","explanation":"APNIC's transfer log records a transfer from Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC) on 2021-03-23 02:54 UTC. The registration changed hands; it is not a new allocation from APNIC.","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 2021-03-23 02:54 UTC, Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC); resources moved: 159.27.0.0/16, 163.228.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20210323.gz","retrieved_at":"2026-10-12T23:40:53+00:00","summary":"APNIC delegated statistics 2021-03-23, before the change: allocated (dated 1992-09-02)"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2021/delegated-apnic-extended-20210324.gz","retrieved_at":"2026-10-12T23:40:56+00:00","summary":"APNIC delegated statistics 2021-03-24, after the change: allocated (dated 1992-09-02)"}]},{"event_id":"280ff4954de1b1b3","registry":"ARIN","report_date":"2019-03-19","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"163.228.0.0/16","start":"163.228.0.0","end":"163.228.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"GlassBridge Enterprises, Inc.","recipient_organization":"Microsoft Singapore Pte. Ltd.","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":"2026-10-14T00:05:23+00:00","page":"https://rirtracker.com/ip/163.228.0.0-163.228.255.255/#e-280ff4954de1b1b3","report_page":"https://rirtracker.com/arin/reports/2019-03-19/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.228.0.0-163.228.255.255.json","observed":"163.228.0.0/16 assigned on 2019-03-19, not listed on 2019-03-20","same_transfer_as":"b5e1580a4949dc3c","explanation":"ARIN's transfer log records a transfer from GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 16:29 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/2019/delegated-arin-extended-20190320.gz","retrieved_at":"2026-10-12T22:02:09+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 163.228.0.0/16 assigned on 2019-03-19, not listed on 2019-03-20"},{"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 2019-03-19 16:29 UTC, GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC); resources moved: 163.228.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190318.gz","retrieved_at":"2026-10-12T22:02:04+00:00","summary":"ARIN delegated statistics 2019-03-18 (produced 2019-03-18T05:00:17+00:00), before the report: assigned (dated 1992-08-24)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190320.gz","retrieved_at":"2026-10-12T22:02:09+00:00","summary":"ARIN delegated statistics 2019-03-20 (produced 2019-03-20T05:00:16+00:00), after the report: not listed"}]},{"event_id":"b5e1580a4949dc3c","registry":"APNIC","report_date":"2019-03-19","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"163.228.0.0/16","start":"163.228.0.0","end":"163.228.255.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into APNIC","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"IMATIO","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":"2026-10-13T23:46:37+00:00","page":"https://rirtracker.com/ip/163.228.0.0-163.228.255.255/#e-b5e1580a4949dc3c","report_page":"https://rirtracker.com/apnic/reports/2019-03-19/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/163.228.0.0-163.228.255.255.json","observed":"Transfer: IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC)","same_transfer_as":"280ff4954de1b1b3","explanation":"APNIC's transfer log records a transfer from IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 05:39 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 2019-03-19 05:39 UTC, IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC); resources moved: 163.228.0.0/16"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2019/delegated-apnic-extended-20190319.gz","retrieved_at":"2026-10-12T22:48:45+00:00","summary":"APNIC delegated statistics 2019-03-19, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2019/delegated-apnic-extended-20190320.gz","retrieved_at":"2026-10-12T22:48:56+00:00","summary":"APNIC delegated statistics 2019-03-20, after the change: allocated (dated 1992-09-02)"}]}],"classification_history":{"3e59a7d580ddb1fa":[{"raw_change_id":37613,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:36:44+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC) on 2021-03-23 02:54 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37613,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:56+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC) on 2021-03-23 02:54 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37613,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:07+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC) on 2021-03-23 02:54 UTC. The registration changed hands; it is not a new allocation from APNIC."},{"raw_change_id":37613,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:42+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from Microsoft Singapore Pte. Ltd. (APNIC) to China Internet Network Information Center/BLUECLOUD (APNIC) on 2021-03-23 02:54 UTC. The registration changed hands; it is not a new allocation from APNIC."}],"280ff4954de1b1b3":[{"raw_change_id":370889,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T05:28:55+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 16:29 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":370889,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:17:19+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 16:29 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":370889,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:01:00+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 16:29 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":370889,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:05:23+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from GlassBridge Enterprises, Inc. (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 16:29 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."}],"b5e1580a4949dc3c":[{"raw_change_id":35752,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:35:56+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 05:39 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35752,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:01:53+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 05:39 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35752,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:03+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 05:39 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":35752,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:37+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from IMATIO (ARIN) to Microsoft Singapore Pte. Ltd. (APNIC) on 2019-03-19 05:39 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."}]},"arin_statistics_now":{"status":"not listed"}}