These entries are queried from radb.net using whois, you can try my project getting these.
:AS54638 route: 12.221.136.0/22 descr: NetSource One origin: AS54638 mnt-by: MAINT-CHTR-WD changed: james.danielsjr [at] chartercom.com 20120420 #14:55:11Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 12.231.166.0/23 descr: NetSource One origin: AS54638 mnt-by: MAINT-CHTR-WD changed: james.danielsjr [at] chartercom.com 20120420 #14:57:22Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 23.136.88.0/24 descr: CHTR-N1 DISCOVERY-Great Lakes origin: AS54638 admin-c: IPADD1-ARIN tech-c: IPADD1-ARIN notify: PublicIPAdressing [at] charter.com mnt-by: MAINT-CHTR-WD changed: PublicIPAdressing [at] charter.com 20221025 source: RADB last-modified: 2023-11-13T16:12:47Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:fdb1::/36 descr: CHTR-N1 DISCOVERY-Great Lakes origin: AS54638 admin-c: IPADDREG tech-c: IPADDREG notify: publicipaddressing [at] charter.com mnt-by: MAINT-CHTR-WD changed: publicipaddressing [at] charter.com 20201208 #18:24:53Z source: RADB last-modified: 2023-11-13T16:11:27Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source