These entries are queried from radb.net using whois, you can try my project getting these.
:AS23254 route: 64.149.136.0/21 descr: US Signal created proxy route for downstream customer. origin: AS23254 mnt-by: MAINT-AS26554 changed: noc [at] ussignalcom.com 20080904 #13:48:37Z source: RADB last-modified: 2023-11-13T15:39:56Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 65.173.52.0/23 descr: CARR INTERNET Route origin: AS23254 mnt-by: I123-MNT changed: rpd [at] 123.net 20050216 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.204.104.0/21 descr: For Downstream Customer Carr Telephone origin: AS23254 mnt-by: MAINT-AS26554 changed: noc [at] ussignalcom.com 20130829 #11:33:41Z source: RADB last-modified: 2023-11-13T15:45:35Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.145.240.0/20 descr: Proxy Registered on behalf of AS23254 origin: AS23254 mnt-by: MAINT-AS30517 changed: rbarber [at] everstream.net 20220324 source: RADB last-modified: 2023-11-13T16:10:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 184.175.136.0/21 descr: US Signal downstream customer origin: AS23254 mnt-by: MAINT-AS26554 changed: noc [at] ussignalcom.com 20110119 #13:28:35Z source: RADB last-modified: 2023-11-13T15:41:15Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source