These entries are queried from radb.net using whois, you can try my project getting these.
:AS21818 route: 74.120.56.0/21 origin: AS21818 mnt-by: MNT-BWTELC descr: 607 Chief St. Benkelman NE 69021 United States tech-c: WH153-ARIN admin-c: HARDW18-ARIN source: ARIN created: 2020-06-15T18:34:06Z last-modified: 2020-06-15T18:34:06Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.120.56.0/21 descr: Proxy fbo BWTelcom (AS21818) origin: AS21818 remarks: Windstream Footprint mnt-by: MAINT-AS7029 changed: David.Friant [at] windstream.com 20161018 source: RADB last-modified: 2023-11-13T15:49:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.255.200.0/22 origin: AS21818 mnt-by: MNT-BWTELC descr: 607 Chief St. Benkelman NE 69021 United States tech-c: WH153-ARIN admin-c: HARDW18-ARIN source: ARIN created: 2020-06-15T18:41:22Z last-modified: 2020-06-15T18:41:22Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.255.200.0/22 descr: Proxy fbo BWTelcom (AS21818) origin: AS21818 remarks: Windstream Footprint mnt-by: MAINT-AS7029 changed: David.Friant [at] windstream.com 20161018 source: RADB last-modified: 2023-11-13T15:49:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2604:6140::/32 origin: AS21818 mnt-by: MNT-BWTELC descr: 607 Chief St. Benkelman NE 69021 United States tech-c: WH153-ARIN admin-c: HARDW18-ARIN source: ARIN created: 2020-06-15T20:03:14Z last-modified: 2020-06-15T20:03:14Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2604:6140::/32 origin: AS21818 descr: Benkelman_Telco_IPv6 mnt-by: MAINT-AS13807 changed: jclingan [at] gpcom.com 20190225 #20:37:55Z source: RADB last-modified: 2023-11-13T15:57:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source