These entries are queried from radb.net using whois, you can try my project getting these.
:AS54946 route: 50.200.180.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS54946 remarks: Proxy entry for customer Metro Health Hospital mnt-by: MAINT-AS7922 changed: wyatt_clarke [at] cable.comcast.com 20140313 #16:56:01Z source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: valid