{"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":"AS231","resource_type":"asn","page":"https://rirtracker.com/asn/231/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2021-06-28)"},"current_holder":{"rir":"ARIN","org":"Michigan State University","handle":"MISU","how":"RDAP, looked up 2026-11-07 18:23 UTC"},"rdap_snapshots":[{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-11-07T18:23:30+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-31T18:27:43+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-29T18:26:54+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-22T20:00:29+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-16T18:20:58+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-13T13:59:51+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"},{"resource_type":"asn","start_key":"000000000000000000000000000000e7","end_key":"000000000000000000000000000000e7","captured_at":"2026-10-09T21:17:42+00:00","reason":"watch","authoritative_rir":"ARIN","handle":"AS231","name":"MISU-231","status":"active","org_handle":"MISU","org_name":"Michigan State University","registration_date":"2021-06-28T10:56:13-04:00","last_changed_date":"2021-06-28T10:56:16-04:00","rdap_url":"https://rdap.arin.net/registry/autnum/231"}],"transfers":[{"id":2493,"date":"2021-06-28T14:56:17Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Merit Network Inc.","recipient_org":"Michigan State University","range":"AS231","log":"ARIN"}],"events":[{"event_id":"66dcf28b40776af2","registry":"ARIN","report_date":"2021-06-28","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS231","resource_type":"asn","resource":"AS231","start":231,"end":231,"classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Merit Network Inc.","recipient_organization":"Michigan State University","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:10+00:00","page":"https://rirtracker.com/asn/231/#e-66dcf28b40776af2","report_page":"https://rirtracker.com/arin/reports/2021-06-28/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/231.json","explanation":"ARIN's transfer log records a transfer from Merit Network Inc. (ARIN) to Michigan State University (ARIN) on 2021-06-28 14:56 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2021-June/004581.html","retrieved_at":"2026-10-12T18:41:21+00:00","summary":"ARIN-Issued report for 2021-06-28: \"Add AS231\""},{"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 2021-06-28 14:56 UTC, Merit Network Inc. (ARIN) to Michigan State University (ARIN); resources moved: AS231"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210627.gz","retrieved_at":"2026-10-12T22:44:53+00:00","summary":"ARIN delegated statistics 2021-06-27 (produced 2021-06-27T14:00:13+00:00), before the report: assigned (dated 1988-09-12)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210629.gz","retrieved_at":"2026-10-12T22:44:57+00:00","summary":"ARIN delegated statistics 2021-06-29 (produced 2021-06-29T14:00:13+00:00), after the report: assigned (dated 2021-06-28)"}]}],"classification_history":{"66dcf28b40776af2":[{"raw_change_id":171804,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:52:49+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Merit Network Inc. (ARIN) to Michigan State University (ARIN) on 2021-06-28 14:56 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":171804,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:03+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Merit Network Inc. (ARIN) to Michigan State University (ARIN) on 2021-06-28 14:56 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":171804,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:50+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Merit Network Inc. (ARIN) to Michigan State University (ARIN) on 2021-06-28 14:56 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":171804,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:10+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Merit Network Inc. (ARIN) to Michigan State University (ARIN) on 2021-06-28 14:56 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"assigned (dated 2021-06-28)"}}