{"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":"199.33.145.0/24","resource_type":"ipv4","page":"https://rirtracker.com/ip/199.33.145.0-199.33.145.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2016-01-22)"},"current_holder":{"rir":"ARIN","org":"MailChimp","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":34089,"date":"2024-01-11T21:57:50Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Rocket Science Group, LLC","recipient_org":"MailChimp","range":"199.33.145.0/24","log":"ARIN"},{"id":6383,"date":"2016-01-22T20:27:12Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"Process Control Systems, Inc.","recipient_org":"The Rocket Science Group, LLC","range":"199.33.145.0/24","log":"ARIN"}],"events":[{"event_id":"16d4a0d317e78321","registry":"ARIN","report_date":"2024-01-11","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"ipv4","resource":"199.33.145.0/24","start":"199.33.145.0","end":"199.33.145.255","classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"The Rocket Science Group, LLC","recipient_organization":"MailChimp","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:12+00:00","page":"https://rirtracker.com/ip/199.33.145.0-199.33.145.255/#e-16d4a0d317e78321","report_page":"https://rirtracker.com/arin/reports/2024-01-11/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/199.33.145.0-199.33.145.255.json","observed":"Merger/acquisition: The Rocket Science Group, LLC (ARIN) to MailChimp (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from The Rocket Science Group, LLC (ARIN) to MailChimp (ARIN) on 2024-01-11 21:57 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 2024-01-11 21:57 UTC, The Rocket Science Group, LLC (ARIN) to MailChimp (ARIN); resources moved: 199.33.145.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240110.gz","retrieved_at":"2026-10-12T23:33:14+00:00","summary":"ARIN delegated statistics 2024-01-10 (produced 2024-01-10T14:00:44+00:00), before the report: allocated (dated 2016-01-22)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2024/delegated-arin-extended-20240112.gz","retrieved_at":"2026-10-12T23:33:29+00:00","summary":"ARIN delegated statistics 2024-01-12 (produced 2024-01-12T14:00:41+00:00), after the report: allocated (dated 2016-01-22)"}]},{"event_id":"ccceb75d9292dab0","registry":"ARIN","report_date":"2016-01-22","source":"arin_issued","raw_action":"ADD","raw_line":"Add 199.33.145.0-199.33.145.255","resource_type":"ipv4","resource":"199.33.145.0/24","start":"199.33.145.0","end":"199.33.145.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"Process Control Systems, Inc.","recipient_organization":"The Rocket Science Group, LLC","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:32+00:00","page":"https://rirtracker.com/ip/199.33.145.0-199.33.145.255/#e-ccceb75d9292dab0","report_page":"https://rirtracker.com/arin/reports/2016-01-22/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/199.33.145.0-199.33.145.255.json","explanation":"ARIN's transfer log records a transfer from Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN) on 2016-01-22 20:27 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/2016-January/002598.html","retrieved_at":"2026-10-12T18:39:04+00:00","summary":"ARIN-Issued report for 2016-01-22: \"Add 199.33.145.0-199.33.145.255\""},{"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 2016-01-22 20:27 UTC, Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN); resources moved: 199.33.145.0/24"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160121.gz","retrieved_at":"2026-10-12T21:04:50+00:00","summary":"ARIN delegated statistics 2016-01-21 (produced 2016-01-21T06:03:42+00:00), before the report: assigned (dated 1994-01-10)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2016/delegated-arin-extended-20160123.gz","retrieved_at":"2026-10-12T21:05:01+00:00","summary":"ARIN delegated statistics 2016-01-23 (produced 2016-01-23T06:04:10+00:00), after the report: assigned (dated 2016-01-22)"}]}],"classification_history":{"16d4a0d317e78321":[{"raw_change_id":569890,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:12+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from The Rocket Science Group, LLC (ARIN) to MailChimp (ARIN) on 2024-01-11 21:57 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."}],"ccceb75d9292dab0":[{"raw_change_id":140693,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:34:43+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN) on 2016-01-22 20:27 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":140693,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:05:49+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN) on 2016-01-22 20:27 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":140693,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:48:26+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN) on 2016-01-22 20:27 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":140693,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:51:32+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from Process Control Systems, Inc. (ARIN) to The Rocket Science Group, LLC (ARIN) on 2016-01-22 20:27 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2016-01-22)"}}