These entries are queried from radb.net using whois, you can try my project getting these.
:AS63102 route: 161.21.0.0/16 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS63102 remarks: Proxy add for customer 1475 Kendale Blvd mnt-by: MAINT-AS7922 changed: chris_johnson8 [at] cable.comcast.com 20141031 source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source