{"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":"159.183.0.0/16","resource_type":"ipv4","page":"https://rirtracker.com/ip/159.183.0.0-159.183.255.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2021-03-01)"},"current_holder":{"rir":"ARIN","org":"Twilio SendGrid","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":23945,"date":"2021-03-01T19:35:05Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"The Pennsylvania State University","recipient_org":"Twilio SendGrid","range":"159.183.0.0/16","log":"ARIN"},{"id":15744,"date":"2018-11-13T12:28:06Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"State System of Higher Education","recipient_org":"The Pennsylvania State University","range":"159.183.0.0/16","log":"ARIN"}],"events":[{"event_id":"5ec38c32c6b3ab9c","registry":"ARIN","report_date":"2021-03-01","source":"arin_issued","raw_action":"ADD","raw_line":"Add 159.183.0.0-159.183.255.255","resource_type":"ipv4","resource":"159.183.0.0/16","start":"159.183.0.0","end":"159.183.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"The Pennsylvania State University","recipient_organization":"Twilio SendGrid","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:05+00:00","page":"https://rirtracker.com/ip/159.183.0.0-159.183.255.255/#e-5ec38c32c6b3ab9c","report_page":"https://rirtracker.com/arin/reports/2021-03-01/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/159.183.0.0-159.183.255.255.json","explanation":"ARIN's transfer log records a transfer from The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN) on 2021-03-01 19:35 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-March/004462.html","retrieved_at":"2026-10-12T18:41:15+00:00","summary":"ARIN-Issued report for 2021-03-01: \"Add 159.183.0.0-159.183.255.255\""},{"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 2021-03-01 19:35 UTC, The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN); resources moved: 159.183.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210228.gz","retrieved_at":"2026-10-12T22:38:57+00:00","summary":"ARIN delegated statistics 2021-02-28 (produced 2021-02-28T15:00:13+00:00), before the report: assigned (dated 2018-11-13)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2021/delegated-arin-extended-20210302.gz","retrieved_at":"2026-10-12T22:39:02+00:00","summary":"ARIN delegated statistics 2021-03-02 (produced 2021-03-02T15:00:13+00:00), after the report: allocated (dated 2021-03-01)"}]},{"event_id":"84089490a7a0cf91","registry":"ARIN","report_date":"2018-11-13","source":"arin_issued","raw_action":"ADD","raw_line":"Add 159.183.0.0-159.183.255.255","resource_type":"ipv4","resource":"159.183.0.0/16","start":"159.183.0.0","end":"159.183.255.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"State System of Higher Education","recipient_organization":"The Pennsylvania State University","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:20+00:00","page":"https://rirtracker.com/ip/159.183.0.0-159.183.255.255/#e-84089490a7a0cf91","report_page":"https://rirtracker.com/arin/reports/2018-11-13/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/159.183.0.0-159.183.255.255.json","explanation":"ARIN's transfer log records a transfer from State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN) on 2018-11-13 12:28 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/2018-November/003625.html","retrieved_at":"2026-10-12T18:40:16+00:00","summary":"ARIN-Issued report for 2018-11-13: \"Add 159.183.0.0-159.183.255.255\""},{"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 2018-11-13 12:28 UTC, State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN); resources moved: 159.183.0.0/16"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20181112.gz","retrieved_at":"2026-10-12T21:55:35+00:00","summary":"ARIN delegated statistics 2018-11-12 (produced 2018-11-12T06:00:10+00:00), before the report: assigned (dated 1992-05-15)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2018/delegated-arin-extended-20181114.gz","retrieved_at":"2026-10-12T21:55:40+00:00","summary":"ARIN delegated statistics 2018-11-14 (produced 2018-11-14T06:00:11+00:00), after the report: assigned (dated 2018-11-13)"}]}],"classification_history":{"5ec38c32c6b3ab9c":[{"raw_change_id":170088,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:51:27+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN) on 2021-03-01 19:35 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":170088,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:59+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN) on 2021-03-01 19:35 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":170088,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:45+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN) on 2021-03-01 19:35 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":170088,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:05+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from The Pennsylvania State University (ARIN) to Twilio SendGrid (ARIN) on 2021-03-01 19:35 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}],"84089490a7a0cf91":[{"raw_change_id":157126,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:42:45+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN) on 2018-11-13 12:28 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":157126,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:25+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN) on 2018-11-13 12:28 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":157126,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:07+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN) on 2018-11-13 12:28 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":157126,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:20+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from State System of Higher Education (ARIN) to The Pennsylvania State University (ARIN) on 2018-11-13 12:28 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 2021-03-01)"}}