These entries are queried from radb.net using whois, you can try my project getting these.
:AS30183 route: 144.121.148.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS30183 remarks: Proxy add for EDIA customer Boardwalk 1000 LLC mnt-by: MAINT-AS7922 changed: orin_flaharty [at] cable.comcast.com 20180919 source: RADB last-modified: 2023-11-13T15:54:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source