{"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":"72.57.128.0/17","resource_type":"ipv4","page":"https://rirtracker.com/ip/72.57.128.0-72.57.255.255/","statistics_now":{"registry":"APNIC","status":"allocated (dated 2008-02-26)"},"current_holder":{"rir":"APNIC","org":"ORG-SNCL3-AP","how":"APNIC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":41232,"date":"2025-09-09T16:07:50Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"T-Mobile USA, Inc.","recipient_org":"ORG-SNCL3-AP","range":"72.57.128.0/17","log":"ARIN"},{"id":131246,"date":"2025-09-09T08:57:22Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"APNIC","source_org":"TMOBI","recipient_org":"Skyline Networks Company Limited","range":"72.57.128.0/17","log":"APNIC"},{"id":22422,"date":"2020-12-31T20:17:58Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Sprint Communications, Inc.","recipient_org":"T-Mobile USA, Inc.","range":"72.56.0.0/13","log":"ARIN"}],"events":[{"event_id":"51f5033c952fa186","registry":"ARIN","report_date":"2025-09-09","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"72.57.128.0/17","start":"72.57.128.0","end":"72.57.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"T-Mobile USA, Inc.","recipient_organization":"ORG-SNCL3-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":"2026-10-14T00:13:38+00:00","page":"https://rirtracker.com/ip/72.57.128.0-72.57.255.255/#e-51f5033c952fa186","report_page":"https://rirtracker.com/arin/reports/2025-09-09/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/72.57.128.0-72.57.255.255.json","observed":"72.57.128.0/17 allocated on 2025-09-09, not listed on 2025-09-10","same_transfer_as":"dfef942898f05118","explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC) on 2025-09-09 16:07 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/2025/delegated-arin-extended-20250910.gz","retrieved_at":"2026-10-13T00:06:33+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 72.57.128.0/17 allocated on 2025-09-09, not listed on 2025-09-10"},{"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 2025-09-09 16:07 UTC, T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC); resources moved: 72.57.128.0/17"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250908.gz","retrieved_at":"2026-10-13T00:06:28+00:00","summary":"ARIN delegated statistics 2025-09-08 (produced 2025-09-08T13:00:51+00:00), before the report: allocated (dated 2008-02-26)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2025/delegated-arin-extended-20250910.gz","retrieved_at":"2026-10-13T00:06:33+00:00","summary":"ARIN delegated statistics 2025-09-10 (produced 2025-09-10T13:00:51+00:00), after the report: not listed"}]},{"event_id":"dfef942898f05118","registry":"APNIC","report_date":"2025-09-09","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"72.57.128.0/17","start":"72.57.128.0","end":"72.57.255.255","classification":"INTER_RIR_TRANSFER_IN","classification_label":"Inter-RIR transfer into APNIC","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"APNIC","source_organization":"TMOBI","recipient_organization":"Skyline Networks Company Limited","inventory_effect":"Transferred into APNIC administration; not a new issuance","inventory_effect_code":"TRANSFER_IN","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:58+00:00","page":"https://rirtracker.com/ip/72.57.128.0-72.57.255.255/#e-dfef942898f05118","report_page":"https://rirtracker.com/apnic/reports/2025-09-09/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/72.57.128.0-72.57.255.255.json","observed":"Transfer: TMOBI (ARIN) to Skyline Networks Company Limited (APNIC)","same_transfer_as":"51f5033c952fa186","explanation":"APNIC's transfer log records a transfer from TMOBI (ARIN) to Skyline Networks Company Limited (APNIC) on 2025-09-09 08:57 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 2025-09-09 08:57 UTC, TMOBI (ARIN) to Skyline Networks Company Limited (APNIC); resources moved: 72.57.128.0/17"},{"type":"delegated_before","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250909.gz","retrieved_at":"2026-10-13T01:45:45+00:00","summary":"APNIC delegated statistics 2025-09-09, before the change: not listed"},{"type":"delegated_after","url":"https://ftp.apnic.net/stats/apnic/2025/delegated-apnic-extended-20250910.gz","retrieved_at":"2026-10-13T01:46:02+00:00","summary":"APNIC delegated statistics 2025-09-10, after the change: allocated (dated 2008-02-26)"}]}],"classification_history":{"51f5033c952fa186":[{"raw_change_id":485418,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T06:17:33+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC) on 2025-09-09 16:07 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":485418,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:24:01+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC) on 2025-09-09 16:07 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":485418,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:08:11+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC) on 2025-09-09 16:07 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":485418,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:13:38+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from T-Mobile USA, Inc. (ARIN) to ORG-SNCL3-AP (APNIC) on 2025-09-09 16:07 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."}],"dfef942898f05118":[{"raw_change_id":44333,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:39:31+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from TMOBI (ARIN) to Skyline Networks Company Limited (APNIC) on 2025-09-09 08:57 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":44333,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:02:09+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from TMOBI (ARIN) to Skyline Networks Company Limited (APNIC) on 2025-09-09 08:57 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":44333,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:44:21+00:00","current":0,"public_explanation":"APNIC's transfer log records a transfer from TMOBI (ARIN) to Skyline Networks Company Limited (APNIC) on 2025-09-09 08:57 UTC: it came to APNIC from ARIN. It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":44333,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:46:58+00:00","current":1,"public_explanation":"APNIC's transfer log records a transfer from TMOBI (ARIN) to Skyline Networks Company Limited (APNIC) on 2025-09-09 08:57 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"}}