These entries are queried from radb.net using whois, you can try my project getting these.
:AS14681 route: 192.30.146.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS14681 remarks: Proxy entry for customer Jayco mnt-by: MAINT-AS7922 changed: wyatt_clarke [at] cable.comcast.com 20140613 #21:06:08Z source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source