{"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":"AS397917","resource_type":"asn","page":"https://rirtracker.com/asn/397917/","statistics_now":{"registry":"ARIN","status":"assigned (dated 2019-09-09)"},"current_holder":{"rir":"ARIN","org":"Asahi Kasei America Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":4899,"date":"2026-01-16T16:19:40Z","type":"MERGER_ACQUISITION","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"POLYPORE INTERNATIONAL","recipient_org":"Asahi Kasei America Inc.","range":"AS397917","log":"ARIN"}],"events":[{"event_id":"084608d0c7936f3c","registry":"ARIN","report_date":"2026-01-16","source":"transfers","raw_action":"TRANSFER","raw_line":null,"resource_type":"asn","resource":"AS397917","start":397917,"end":397917,"classification":"MERGER_ACQUISITION","classification_label":"Merger/acquisition or reorganization","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"POLYPORE INTERNATIONAL","recipient_organization":"Asahi Kasei America Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:25+00:00","page":"https://rirtracker.com/asn/397917/#e-084608d0c7936f3c","report_page":"https://rirtracker.com/arin/reports/2026-01-16/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/397917.json","observed":"Merger/acquisition: POLYPORE INTERNATIONAL (ARIN) to Asahi Kasei America Inc. (ARIN)","explanation":"ARIN's transfer log records a merger, acquisition or reorganization from POLYPORE INTERNATIONAL (ARIN) to Asahi Kasei America Inc. (ARIN) on 2026-01-16 16:19 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 2026-01-16 16:19 UTC, POLYPORE INTERNATIONAL (ARIN) to Asahi Kasei America Inc. (ARIN); resources moved: AS397917"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260115","retrieved_at":"2026-10-09T18:55:01+00:00","summary":"ARIN delegated statistics 2026-01-15 (produced 2026-01-15T14:00:48+00:00), before the report: assigned (dated 2019-09-09)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/delegated-arin-extended-20260117","retrieved_at":"2026-10-09T18:55:07+00:00","summary":"ARIN delegated statistics 2026-01-17 (produced 2026-01-17T14:00:47+00:00), after the report: assigned (dated 2019-09-09)"}]},{"event_id":"3ebf13dba0d2300c","registry":"ARIN","report_date":"2019-09-09","source":"arin_issued","raw_action":"ADD","raw_line":"Add AS397917","resource_type":"asn","resource":"AS397917","start":397917,"end":397917,"classification":"APPARENT_NEW_ISSUANCE","classification_label":"Apparent new issuance","confidence":"STRONG_INFERENCE","source_rir":null,"recipient_rir":null,"source_organization":null,"recipient_organization":null,"inventory_effect":"Likely issued from ARIN-controlled inventory","inventory_effect_code":"ISSUED","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:36+00:00","page":"https://rirtracker.com/asn/397917/#e-3ebf13dba0d2300c","report_page":"https://rirtracker.com/arin/reports/2019-09-09/","evidence_url":"https://rirtracker.com/api/v1/resources/asn/397917.json","explanation":"No transfer record matches. ARIN's statistics show it available on 2019-09-08 and assigned (dated 2019-09-09) on 2019-09-10. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2019-September/003924.html","retrieved_at":"2026-10-12T18:40:37+00:00","summary":"ARIN-Issued report for 2019-09-09: \"Add AS397917\""},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190908.gz","retrieved_at":"2026-10-12T22:10:50+00:00","summary":"ARIN delegated statistics 2019-09-08 (produced 2019-09-08T14:00:16+00:00), before the report: available"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2019/delegated-arin-extended-20190910.gz","retrieved_at":"2026-10-12T22:10:55+00:00","summary":"ARIN delegated statistics 2019-09-10 (produced 2019-09-10T14:00:16+00:00), after the report: assigned (dated 2019-09-09)"}]}],"classification_history":{"084608d0c7936f3c":[{"raw_change_id":575304,"classification_code":"MERGER_ACQUISITION","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-14T00:19:25+00:00","current":1,"public_explanation":"ARIN's transfer log records a merger, acquisition or reorganization from POLYPORE INTERNATIONAL (ARIN) to Asahi Kasei America Inc. (ARIN) on 2026-01-16 16:19 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."}],"3ebf13dba0d2300c":[{"raw_change_id":161490,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.0","classified_at":"2026-10-13T03:45:39+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2019-09-08 and assigned (dated 2019-09-09) on 2019-09-10. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":161490,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.1","classified_at":"2026-10-13T08:06:37+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2019-09-08 and assigned (dated 2019-09-09) on 2019-09-10. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":161490,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.3.2","classified_at":"2026-10-13T14:49:21+00:00","current":0,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2019-09-08 and assigned (dated 2019-09-09) on 2019-09-10. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."},{"raw_change_id":161490,"classification_code":"APPARENT_NEW_ISSUANCE","confidence":"STRONG_INFERENCE","classifier_version":"1.4.0","classified_at":"2026-10-13T23:52:36+00:00","current":1,"public_explanation":"No transfer record matches. ARIN's statistics show it available on 2019-09-08 and assigned (dated 2019-09-09) on 2019-09-10. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN."}]},"arin_statistics_now":{"status":"assigned (dated 2019-09-09)"}}