These entries are queried from radb.net using whois, you can try my project getting these.
:AS3820 route: 149.28.0.0/21 descr: APS proxy-registered route object remarks: APS proxy-registered route object remarks: -------------------------------------------------------- remarks: This route object was proxy-registered by Voxel for remarks: APS, given a lack of IRR object on their remarks: part. For questions or comments regarding this object, remarks: please contactvoxel.net>. admin-c: VDN-ARIN tech-c: VDN-ARIN origin: AS3820 mnt-by: MAINT-AS29791 changed: ip-admin [at] voxel.net 20100910 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.76.207.0/24 descr: Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054 origin: AS3820 remarks: Proxy add for customer American Institute of Physics mnt-by: MAINT-AS7922 changed: chris_johnson8 [at] cable.comcast.com 20180116 source: RADB last-modified: 2023-11-13T15:54:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source