These entries are queried from radb.net using whois, you can try my project getting these.
:AS22602 route: 12.253.50.0/23 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS22602 remarks: Proxy add for customer EXPERIENT, INC. mnt-by: MAINT-AS7922 changed: chris_johnson8 [at] cable.comcast.com 20170414 source: RADB last-modified: 2023-11-13T15:54:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source