These entries are queried from radb.net using whois, you can try my project getting these.
:AS46670 route: 204.90.52.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS46670 remarks: Proxy entry for customer Marketing Associates mnt-by: MAINT-AS7922 changed: matthew_berlin [at] cable.comcast.com 20140619 #17:16:01Z 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: 204.90.53.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS46670 remarks: Proxy entry for customer Marketing Associates mnt-by: MAINT-AS7922 changed: matthew_berlin [at] cable.comcast.com 20140619 #17:17:36Z 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: 204.90.54.0/24 descr: ADDED FOR - AS46670 origin: AS46670 notify: noc [at] 123.net mnt-by: I123-MNT changed: rpd [at] 123.net 20211220 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.90.55.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS46670 remarks: Proxy entry for customer Marketing Associates mnt-by: MAINT-AS7922 changed: matthew_berlin [at] cable.comcast.com 20140619 #17:18:33Z source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source