{"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":"161.157.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/161.157.0.0-161.157.255.255/","statistics_now":{"registry":"RIPE NCC","status":"allocated (dated 1992-12-21)"},"current_holder":{"rir":"RIPE NCC","org":"Microsoft Limited [ORG-MA42-RIPE]","how":"The RIPE NCC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":100063,"date":"2023-11-27T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Microsoft Limited","range":"161.157.0.0/16","log":"RIPE NCC"},{"id":33703,"date":"2023-11-27T15:03:55Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"Exxon Mobil Corporation","recipient_org":"Microsoft Limited [ORG-MA42-RIPE]","range":"161.157.0.0/16","log":"ARIN"},{"id":27241,"date":"2022-03-23T17:01:07Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Advanced Elastomer Systems, L.P.","recipient_org":"Exxon Mobil Corporation","range":"161.157.0.0/16","log":"ARIN"}],"events":[{"event_id":"50a5a00ccffd9b63","registry":"ARIN","report_date":"2023-11-27","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"161.157.0.0/16","start":"161.157.0.0","end":"161.157.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_organization":"Exxon Mobil Corporation","recipient_organization":"Microsoft Limited [ORG-MA42-RIPE]","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":"2026-10-14T00:11:20+00:00","page":"https://rirtracker.com/ip/161.157.0.0-161.157.255.255/#e-50a5a00ccffd9b63","report_page":"https://rirtracker.com/arin/reports/2023-11-27/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.157.0.0-161.157.255.255.json","observed":"161.157.0.0/16 allocated on 2023-11-27, not listed on 2023-11-28","same_transfer_as":"c0ccea7c5bfc63eb","explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC) on 2023-11-27 15:03 UTC: it left ARIN for the RIPE NCC. 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/2023/delegated-arin-extended-20231128.gz","retrieved_at":"2026-10-12T23:31:02+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 161.157.0.0/16 allocated on 2023-11-27, not listed on 2023-11-28"},{"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 2023-11-27 15:03 UTC, Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC); resources moved: 161.157.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20231126.gz","retrieved_at":"2026-10-12T23:30:57+00:00","summary":"ARIN delegated statistics 2023-11-26 (produced 2023-11-26T14:00:33+00:00), before the report: allocated (dated 1992-12-21)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20231128.gz","retrieved_at":"2026-10-12T23:31:02+00:00","summary":"ARIN delegated statistics 2023-11-28 (produced 2023-11-28T14:00:34+00:00), after the report: not listed"}]},{"event_id":"c0ccea7c5bfc63eb","registry":"RIPE NCC","report_date":"2023-11-27","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"161.157.0.0/16","start":"161.157.0.0","end":"161.157.255.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into the RIPE NCC","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_organization":null,"recipient_organization":"Microsoft Limited","inventory_effect":"Transferred into RIPE NCC administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:49:46+00:00","page":"https://rirtracker.com/ip/161.157.0.0-161.157.255.255/#e-c0ccea7c5bfc63eb","report_page":"https://rirtracker.com/ripe/reports/2023-11-27/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.157.0.0-161.157.255.255.json","observed":"Transfer: (no name) (ARIN) to Microsoft Limited (RIPE NCC)","same_transfer_as":"50a5a00ccffd9b63","explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-11-27 19:00 UTC: it came to the RIPE NCC from ARIN. It was already issued by another registry, so this is not a new issuance.","evidence":[{"type":"transfer","url":"https://ftp.ripe.net/pub/stats/ripencc/transfers/transfers_latest.json","retrieved_at":"2026-10-13T21:49:37+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2023-11-27 19:00 UTC, (no name) (ARIN) to Microsoft Limited (RIPE NCC); resources moved: 161.157.0.0/16"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2023/delegated-ripencc-extended-20231126.bz2","retrieved_at":"2026-10-13T00:17:27+00:00","summary":"RIPE NCC delegated statistics 2023-11-26 (produced 2023-11-26T22:59:59+00:00), before the change: not listed"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2023/delegated-ripencc-extended-20231127.bz2","retrieved_at":"2026-10-13T00:17:30+00:00","summary":"RIPE NCC delegated statistics 2023-11-27 (produced 2023-11-27T22:59:59+00:00), after the change: allocated (dated 1992-12-21)"}]},{"event_id":"9e5738e7c8bb8417","registry":"ARIN","report_date":"2022-03-23","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"161.157.0.0/16","start":"161.157.0.0","end":"161.157.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Advanced Elastomer Systems, L.P.","recipient_organization":"Exxon Mobil Corporation","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:00+00:00","page":"https://rirtracker.com/ip/161.157.0.0-161.157.255.255/#e-9e5738e7c8bb8417","report_page":"https://rirtracker.com/arin/reports/2022-03-23/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.157.0.0-161.157.255.255.json","observed":"Merger/acquisition: Advanced Elastomer Systems, L.P. (ARIN) to Exxon Mobil Corporation (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Advanced Elastomer Systems, L.P. (ARIN) to Exxon Mobil Corporation (ARIN) on 2022-03-23 17:01 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 2022-03-23 17:01 UTC, Advanced Elastomer Systems, L.P. (ARIN) to Exxon Mobil Corporation (ARIN); resources moved: 161.157.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2022/delegated-arin-extended-20220322.gz","retrieved_at":"2026-10-12T22:58:41+00:00","summary":"ARIN delegated statistics 2022-03-22 (produced 2022-03-22T13:00:11+00:00), before the report: allocated (dated 1992-12-21)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2022/delegated-arin-extended-20220324.gz","retrieved_at":"2026-10-12T22:58:46+00:00","summary":"ARIN delegated statistics 2022-03-24 (produced 2022-03-24T13:00:11+00:00), after the report: allocated (dated 1992-12-21)"}]}],"classification_history":{"50a5a00ccffd9b63":[{"raw_change_id":457276,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T06:04:29+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC) on 2023-11-27 15:03 UTC: it left ARIN for the RIPE NCC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":457276,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:22:14+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC) on 2023-11-27 15:03 UTC: it left ARIN for the RIPE NCC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":457276,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:06:17+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC) on 2023-11-27 15:03 UTC: it left ARIN for the RIPE NCC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."},{"raw_change_id":457276,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:11:20+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Exxon Mobil Corporation (ARIN) to Microsoft Limited [ORG-MA42-RIPE] (RIPE NCC) on 2023-11-27 15:03 UTC: it left ARIN for the RIPE NCC. ARIN-Issued didn't list this change; it is not a new allocation and is not offered to ARIN applicants."}],"c0ccea7c5bfc63eb":[{"raw_change_id":100594,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:02:56+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-11-27 19:00 UTC: it came to the RIPE NCC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":100594,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:04:28+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-11-27 19:00 UTC: it came to the RIPE NCC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":100594,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:46:55+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-11-27 19:00 UTC: it came to the RIPE NCC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":100594,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:49:46+00:00","current":1,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-11-27 19:00 UTC: it came to the RIPE NCC from ARIN. It was already issued by another registry, so this is not a new issuance."}],"9e5738e7c8bb8417":[{"raw_change_id":564998,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:00+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Advanced Elastomer Systems, L.P. (ARIN) to Exxon Mobil Corporation (ARIN) on 2022-03-23 17:01 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."}]},"arin_statistics_now":{"status":"not listed"}}