These entries are queried from radb.net using whois, you can try my project getting these.
:AS19821 route: 24.244.253.0/24 descr: Proxy for Allstream Customer origin: AS19821 remarks: Automated Proxy Route Entry mnt-by: MAINT-AS15290 changed: ali.zerik [at] mtsallstream.com 20150320 source: RADB last-modified: 2023-11-13T16:00:08Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 24.244.253.0/24 descr: ASC Corp AS19821 (added by MNT-EDAP) origin: AS19821 remarks: ------------------------------------------------- remarks: - This route object was registered by - remarks: - Cygnal Technologies MNT-EDAP - remarks: - on behalf of their customer: - remarks: - ACS Corp in Toronto - remarks: ------------------------------------------------- mnt-by: MNT-EDAP changed: mackley [at] cygnal.ca 20080915 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.50.146.0/24 descr: Proxy for Allstream Customer origin: AS19821 remarks: Automated Proxy Route Entry mnt-by: MAINT-AS15290 changed: ali.zerik [at] mtsallstream.com 20150320 source: RADB last-modified: 2023-11-13T16:00:08Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source