{"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":"173.200.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/173.200.0.0-173.200.255.255/","statistics_now":{"registry":"RIPE NCC","status":"allocated (dated 2009-09-10)"},"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":96683,"date":"2023-06-28T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Microsoft Limited","range":"173.200.0.0/16","log":"RIPE NCC"},{"id":32349,"date":"2023-06-28T13:59:14Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"Fusion Communications, LLC","recipient_org":"Microsoft Limited (ORG-MA42-RIPE)","range":"173.200.0.0/16","log":"ARIN"}],"events":[{"event_id":"d332b4da8b934d1e","registry":"ARIN","report_date":"2023-06-28","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"173.200.0.0/16","start":"173.200.0.0","end":"173.200.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_organization":"Fusion Communications, LLC","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":"2026-10-14T00:10:48+00:00","page":"https://rirtracker.com/ip/173.200.0.0-173.200.255.255/#e-d332b4da8b934d1e","report_page":"https://rirtracker.com/arin/reports/2023-06-28/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/173.200.0.0-173.200.255.255.json","observed":"173.200.0.0/16 allocated on 2023-06-28, not listed on 2023-06-29","same_transfer_as":"d8e6a1cba4bc30fb","explanation":"ARIN's transfer log records a transfer from Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC) on 2023-06-28 13:59 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-20230629.gz","retrieved_at":"2026-10-12T23:23:01+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 173.200.0.0/16 allocated on 2023-06-28, not listed on 2023-06-29"},{"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 2023-06-28 13:59 UTC, Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC); resources moved: 173.200.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230627.gz","retrieved_at":"2026-10-12T23:22:57+00:00","summary":"ARIN delegated statistics 2023-06-27 (produced 2023-06-27T13:00:11+00:00), before the report: allocated (dated 2009-09-10)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230629.gz","retrieved_at":"2026-10-12T23:23:01+00:00","summary":"ARIN delegated statistics 2023-06-29 (produced 2023-06-29T13:00:12+00:00), after the report: not listed"}]},{"event_id":"d8e6a1cba4bc30fb","registry":"RIPE NCC","report_date":"2023-06-28","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"173.200.0.0/16","start":"173.200.0.0","end":"173.200.255.255","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":"2026-10-13T23:49:35+00:00","page":"https://rirtracker.com/ip/173.200.0.0-173.200.255.255/#e-d8e6a1cba4bc30fb","report_page":"https://rirtracker.com/ripe/reports/2023-06-28/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/173.200.0.0-173.200.255.255.json","observed":"Transfer: (no name) (ARIN) to Microsoft Limited (RIPE NCC)","same_transfer_as":"d332b4da8b934d1e","explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Microsoft Limited (RIPE NCC) on 2023-06-28 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 2023-06-28 19:00 UTC, (no name) (ARIN) to Microsoft Limited (RIPE NCC); resources moved: 173.200.0.0/16"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2023/delegated-ripencc-extended-20230627.bz2","retrieved_at":"2026-10-13T00:05:48+00:00","summary":"RIPE NCC delegated statistics 2023-06-27 (produced 2023-06-27T21:59:59+00:00), before the change: not listed"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2023/delegated-ripencc-extended-20230628.bz2","retrieved_at":"2026-10-13T00:05:51+00:00","summary":"RIPE NCC delegated statistics 2023-06-28 (produced 2023-06-28T21:59:59+00:00), after the change: allocated (dated 2009-09-10)"}]},{"event_id":"fd03746b2daba514","registry":"ARIN","report_date":"2009-09-10","source":"arin_issued","raw_action":"ADD","raw_line":"Add 173.200.0.0-173.200.255.255","resource_type":"ipv4","resource":"173.200.0.0/16","start":"173.200.0.0","end":"173.200.255.255","classification":"APPARENT_NEW_ISSUANCE","classification_label":"Apparent new issuance","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":"2026-10-13T23:50:46+00:00","page":"https://rirtracker.com/ip/173.200.0.0-173.200.255.255/#e-fd03746b2daba514","report_page":"https://rirtracker.com/arin/reports/2009-09-10/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/173.200.0.0-173.200.255.255.json","explanation":"No transfer record matches. ARIN's statistics show it not issued on 2009-09-09 and allocated (dated 2009-09-10) on 2009-09-11. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2009-September/000266.html","retrieved_at":"2026-10-12T18:36:24+00:00","summary":"ARIN-Issued report for 2009-09-10: \"Add 173.200.0.0-173.200.255.255\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090909.gz","retrieved_at":"2026-10-12T18:54:57+00:00","summary":"ARIN delegated statistics 2009-09-09, before the report: not issued"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2009/delegated-arin-20090911.gz","retrieved_at":"2026-10-12T18:55:04+00:00","summary":"ARIN delegated statistics 2009-09-11, after the report: allocated (dated 2009-09-10)"}]}],"classification_history":{"d332b4da8b934d1e":[{"raw_change_id":450141,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T06:01:15+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC) on 2023-06-28 13:59 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":450141,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:21:49+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC) on 2023-06-28 13:59 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":450141,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:05:50+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC) on 2023-06-28 13:59 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":450141,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:10:48+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Fusion Communications, LLC (ARIN) to Microsoft Limited (ORG-MA42-RIPE) (RIPE NCC) on 2023-06-28 13:59 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."}],"d8e6a1cba4bc30fb":[{"raw_change_id":97153,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:01:27+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 2023-06-28 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":97153,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:04:19+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 2023-06-28 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":97153,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:46:46+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 2023-06-28 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":97153,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:49:35+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 2023-06-28 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."}],"fd03746b2daba514":[{"raw_change_id":120292,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:11:36+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2009-09-09 and allocated (dated 2009-09-10) on 2009-09-11. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":120292,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:15+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2009-09-09 and allocated (dated 2009-09-10) on 2009-09-11. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":120292,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:47:48+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2009-09-09 and allocated (dated 2009-09-10) on 2009-09-11. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":120292,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:50:46+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it not issued on 2009-09-09 and allocated (dated 2009-09-10) on 2009-09-11. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."}]},"arin_statistics_now":{"status":"not listed"}}