These entries are queried from radb.net using whois, you can try my project getting these.
:AS30421 route: 38.124.244.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS30421 remarks: Proxy for EDI customer The Signature Group mnt-by: MAINT-AS7922 changed: courtney_smith [at] nospamhere.cable.comcast.com 20150316 source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 38.127.196.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS30421 remarks: Proxy for EDI customer The Signature Group mnt-by: MAINT-AS7922 changed: courtney_smith [at] nospamhere.cable.comcast.com 20150316 source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.200.84.0/23 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS30421 remarks: Proxy for EDI customer The Signature Group mnt-by: MAINT-AS7922 changed: courtney_smith [at] nospamhere.cable.comcast.com 20150403 source: RADB last-modified: 2023-11-13T15:54:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source