These entries are queried from radb.net using whois, you can try my project getting these.
:AS31816 route: 192.149.74.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS31816 remarks: Proxy add for customer National Marrow Donor Program mnt-by: MAINT-AS7922 changed: chris_johnson8 [at] cable.comcast.com 20170130 source: RADB last-modified: 2023-11-13T15:54:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.175.249.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS31816 remarks: Proxy add for customer National Marrow Donor Program mnt-by: MAINT-AS7922 changed: chris_johnson8 [at] cable.comcast.com 20170130 source: RADB last-modified: 2023-11-13T15:54:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.175.249.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS31816 remarks: Proxy add for customer National Marrow Donor Program mnt-by: MAINT-AS7922 changed: wyatt_clarke [at] cable.comcast.com 20180522 #23:15:50Z source: RADB last-modified: 2023-11-13T15:54:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source