These entries are queried from radb.net using whois, you can try my project getting these.
:AS53461 route: 131.239.29.0/24 descr: Enterprise Bank and Trust origin: AS53461 mnt-by: ONECOMM-MNT changed: ewallace [at] one.communications.com 20101018 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.239.29.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS53461 remarks: Proxy object for EDIA cust Enterprise Bank and Trust mnt-by: MAINT-AS7922 changed: courtney_smith [at] nospamhere.cable.comcast.com 20111206 source: RADB last-modified: 2023-11-13T15:54:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source