{"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":"161.97.176.0/21","resource_type":"ipv4","page":"https://rirtracker.com/ip/161.97.176.0-161.97.183.255/","statistics_now":{"registry":"RIPE NCC","status":"allocated (dated 1992-06-23)"},"current_holder":{"rir":"RIPE NCC","org":"Contabo GmbH","how":"The RIPE NCC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":70018,"date":"2020-05-07T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Contabo GmbH","range":"161.97.176.0/21","log":"RIPE NCC"},{"id":20640,"date":"2020-05-07T14:48:36Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"Boulder Valley School District  (BVSD)","recipient_org":"Contabo GmbH","range":"161.97.176.0/21","log":"ARIN"}],"events":[{"event_id":"6dcc9b2be2a6f9f9","registry":"ARIN","report_date":"2020-05-07","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"161.97.176.0/21","start":"161.97.176.0","end":"161.97.183.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_organization":"Boulder Valley School District  (BVSD)","recipient_organization":"Contabo GmbH","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":"2026-10-14T00:06:57+00:00","page":"https://rirtracker.com/ip/161.97.176.0-161.97.183.255/#e-6dcc9b2be2a6f9f9","report_page":"https://rirtracker.com/arin/reports/2020-05-07/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.97.176.0-161.97.183.255.json","observed":"161.97.176.0/21 assigned on 2020-05-07, not listed on 2020-05-08","same_transfer_as":"bae997c411a42ca0","explanation":"ARIN's transfer log records a transfer from Boulder Valley School District  (BVSD) (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 14:48 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/2020/delegated-arin-extended-20200508.gz","retrieved_at":"2026-10-12T22:23:48+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 161.97.176.0/21 assigned on 2020-05-07, not listed on 2020-05-08"},{"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 2020-05-07 14:48 UTC, Boulder Valley School District  (BVSD) (ARIN) to Contabo GmbH (RIPE NCC); resources moved: 161.97.176.0/21"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200506.gz","retrieved_at":"2026-10-12T22:23:31+00:00","summary":"ARIN delegated statistics 2020-05-06 (produced 2020-05-06T14:00:13+00:00), before the report: assigned (dated 1992-06-23)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2020/delegated-arin-extended-20200508.gz","retrieved_at":"2026-10-12T22:23:48+00:00","summary":"ARIN delegated statistics 2020-05-08 (produced 2020-05-08T14:00:14+00:00), after the report: not listed"}]},{"event_id":"bae997c411a42ca0","registry":"RIPE NCC","report_date":"2020-05-07","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"161.97.176.0/21","start":"161.97.176.0","end":"161.97.183.255","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":"Contabo GmbH","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":"2026-10-13T23:48:11+00:00","page":"https://rirtracker.com/ip/161.97.176.0-161.97.183.255/#e-bae997c411a42ca0","report_page":"https://rirtracker.com/ripe/reports/2020-05-07/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/161.97.176.0-161.97.183.255.json","observed":"Transfer: (no name) (ARIN) to Contabo GmbH (RIPE NCC)","same_transfer_as":"6dcc9b2be2a6f9f9","explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 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 2020-05-07 19:00 UTC, (no name) (ARIN) to Contabo GmbH (RIPE NCC); resources moved: 161.97.176.0/21"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2020/delegated-ripencc-extended-20200506.bz2","retrieved_at":"2026-10-12T22:37:35+00:00","summary":"RIPE NCC delegated statistics 2020-05-06 (produced 2020-05-06T21:59:59+00:00), before the change: not listed"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2020/delegated-ripencc-extended-20200507.bz2","retrieved_at":"2026-10-12T22:37:39+00:00","summary":"RIPE NCC delegated statistics 2020-05-07 (produced 2020-05-07T21:59:59+00:00), after the change: allocated (dated 1992-06-23)"}]}],"classification_history":{"6dcc9b2be2a6f9f9":[{"raw_change_id":395211,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T05:37:29+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Boulder Valley School District  (BVSD) (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 14:48 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":395211,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:18:38+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Boulder Valley School District  (BVSD) (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 14:48 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":395211,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:02:24+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Boulder Valley School District  (BVSD) (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 14:48 UTC: it left ARIN for the RIPE NCC. 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It was already issued by another registry, so this is not a new issuance."},{"raw_change_id":69781,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:48:11+00:00","current":1,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Contabo GmbH (RIPE NCC) on 2020-05-07 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."}]},"arin_statistics_now":{"status":"not listed"}}