These entries are queried from radb.net using whois, you can try my project getting these.
:AS20048 route: 204.29.0.0/21 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS20048 remarks: Proxy for EDIA customer CDGI NAP Services mnt-by: MAINT-AS7922 changed: robert_beauvais [at] cable.comcast.com 20120524 #13:56:47Z source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source