{"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":"157.231.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/157.231.0.0-157.231.255.255/","statistics_now":{"registry":"RIPE NCC","status":"assigned (dated 1992-01-31)"},"current_holder":{"rir":"RIPE NCC","org":"Gamma Telecom Limited ORG-GTL-19-RIPE","how":"The RIPE NCC's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":61988,"date":"2018-12-31T19:00:00Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":null,"recipient_org":"Gamma Telecom Limited","range":"157.231.0.0/16","log":"RIPE NCC"},{"id":16705,"date":"2018-12-31T12:41:20Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_org":"QUADRAMED","recipient_org":"Gamma Telecom Limited ORG-GTL-19-RIPE","range":"157.231.0.0/16","log":"ARIN"},{"id":13372,"date":"2018-06-14T19:34:15Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Health Data Sciences Corporation","recipient_org":"QUADRAMED","range":"157.231.0.0/16","log":"ARIN"}],"events":[{"event_id":"6b0d6d54b103c6a7","registry":"ARIN","report_date":"2018-12-31","source":"statistics","raw_action":"NOT_IN_ARIN_ISSUED","raw_line":null,"resource_type":"ipv4","resource":"157.231.0.0/16","start":"157.231.0.0","end":"157.231.255.255","classification":"INTER_RIR_TRANSFER_OUT","classification_label":"Inter-RIR transfer out of ARIN","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"RIPE NCC","source_organization":"QUADRAMED","recipient_organization":"Gamma Telecom Limited ORG-GTL-19-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":"2026-10-14T00:05:04+00:00","page":"https://rirtracker.com/ip/157.231.0.0-157.231.255.255/#e-6b0d6d54b103c6a7","report_page":"https://rirtracker.com/arin/reports/2018-12-31/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/157.231.0.0-157.231.255.255.json","observed":"157.231.0.0/16 assigned on 2018-12-31, not listed on 2019-01-01","same_transfer_as":"3828e89ae76d041c","explanation":"ARIN's transfer log records a transfer from QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC) on 2018-12-31 12:41 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/2019/delegated-arin-extended-20190101.gz","retrieved_at":"2026-10-12T21:58:03+00:00","summary":"Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 157.231.0.0/16 assigned on 2018-12-31, not listed on 2019-01-01"},{"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 2018-12-31 12:41 UTC, QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC); resources moved: 157.231.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20181230.gz","retrieved_at":"2026-10-12T21:57:58+00:00","summary":"ARIN delegated statistics 2018-12-30 (produced 2018-12-30T06:00:12+00:00), before the report: assigned (dated 1992-01-31)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190101.gz","retrieved_at":"2026-10-12T21:58:03+00:00","summary":"ARIN delegated statistics 2019-01-01 (produced 2019-01-01T06:00:10+00:00), after the report: not listed"}]},{"event_id":"3828e89ae76d041c","registry":"RIPE NCC","report_date":"2018-12-31","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"157.231.0.0/16","start":"157.231.0.0","end":"157.231.255.255","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":"Gamma Telecom 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":"2026-10-13T23:47:46+00:00","page":"https://rirtracker.com/ip/157.231.0.0-157.231.255.255/#e-3828e89ae76d041c","report_page":"https://rirtracker.com/ripe/reports/2018-12-31/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/157.231.0.0-157.231.255.255.json","observed":"Transfer: (no name) (ARIN) to Gamma Telecom Limited (RIPE NCC)","same_transfer_as":"6b0d6d54b103c6a7","explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Gamma Telecom Limited (RIPE NCC) on 2018-12-31 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 2018-12-31 19:00 UTC, (no name) (ARIN) to Gamma Telecom Limited (RIPE NCC); resources moved: 157.231.0.0/16"},{"type":"delegated_before","url":"https://ftp.ripe.net/pub/stats/ripencc/2018/delegated-ripencc-extended-20181230.bz2","retrieved_at":"2026-10-12T22:00:57+00:00","summary":"RIPE NCC delegated statistics 2018-12-30 (produced 2018-12-30T22:59:59+00:00), before the change: not listed"},{"type":"delegated_after","url":"https://ftp.ripe.net/pub/stats/ripencc/2018/delegated-ripencc-extended-20181231.bz2","retrieved_at":"2026-10-12T22:01:00+00:00","summary":"RIPE NCC delegated statistics 2018-12-31 (produced 2018-12-31T22:59:59+00:00), after the change: assigned (dated 1992-01-31)"}]},{"event_id":"21a27168012c0329","registry":"ARIN","report_date":"2018-06-14","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"157.231.0.0/16","start":"157.231.0.0","end":"157.231.255.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Health Data Sciences Corporation","recipient_organization":"QUADRAMED","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:36+00:00","page":"https://rirtracker.com/ip/157.231.0.0-157.231.255.255/#e-21a27168012c0329","report_page":"https://rirtracker.com/arin/reports/2018-06-14/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/157.231.0.0-157.231.255.255.json","observed":"Merger/acquisition: Health Data Sciences Corporation (ARIN) to QUADRAMED (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Health Data Sciences Corporation (ARIN) to QUADRAMED (ARIN) on 2018-06-14 19:34 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 2018-06-14 19:34 UTC, Health Data Sciences Corporation (ARIN) to QUADRAMED (ARIN); resources moved: 157.231.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180613.gz","retrieved_at":"2026-10-12T21:47:44+00:00","summary":"ARIN delegated statistics 2018-06-13 (produced 2018-06-13T05:00:23+00:00), before the report: assigned (dated 1992-01-31)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20180615.gz","retrieved_at":"2026-10-12T21:47:49+00:00","summary":"ARIN delegated statistics 2018-06-15 (produced 2018-06-15T05:00:23+00:00), after the report: assigned (dated 1992-01-31)"}]}],"classification_history":{"6b0d6d54b103c6a7":[{"raw_change_id":365872,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T05:26:41+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC) on 2018-12-31 12:41 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":365872,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:17:04+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC) on 2018-12-31 12:41 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":365872,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T15:00:43+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC) on 2018-12-31 12:41 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":365872,"classification_code":"INTER_RIR_TRANSFER_OUT","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:05:04+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from QUADRAMED (ARIN) to Gamma Telecom Limited ORG-GTL-19-RIPE (RIPE NCC) on 2018-12-31 12:41 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."}],"3828e89ae76d041c":[{"raw_change_id":61396,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T02:46:27+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Gamma Telecom Limited (RIPE NCC) on 2018-12-31 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":61396,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:02:50+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Gamma Telecom Limited (RIPE NCC) on 2018-12-31 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":61396,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:45:06+00:00","current":0,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Gamma Telecom Limited (RIPE NCC) on 2018-12-31 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":61396,"classification_code":"INTER_RIR_TRANSFER_IN","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:47:46+00:00","current":1,"public_explanation":"The RIPE NCC's transfer log records a transfer from an unnamed organization (ARIN) to Gamma Telecom Limited (RIPE NCC) on 2018-12-31 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."}],"21a27168012c0329":[{"raw_change_id":554795,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:18:36+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from Health Data Sciences Corporation (ARIN) to QUADRAMED (ARIN) on 2018-06-14 19:34 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"}}