These entries are queried from radb.net using whois, you can try my project getting these.
:AS46966 route: 192.81.49.0/24 descr: Proxy Add For Charter Customer City of Grand Island origin: AS46966 mnt-by: MAINT-CHTR-WD changed: rob.beauvais [at] charter.com 20150911 #19:27:28Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: valid route: 192.81.49.0/24 origin: AS46966 descr: City of Grand Island PO Box 1968 Grand Island NE 68802 United States remarks: City of Grand Island, NE, USA network admin-c: GOSDA-ARIN tech-c: DUEYA-ARIN tech-c: GOSDA-ARIN mnt-by: MNT-CGI-40 created: 2022-10-26T18:13:26Z last-modified: 2022-10-26T18:13:26Z source: ARIN rpki-ov-state: valid route6: 2602:811:7000::/40 origin: AS46966 descr: City of Grand Island mnt-by: MAINT-AS15108 changed: jvolz [at] allophone.net 20230227 #20:47:51Z source: RADB last-modified: 2023-11-13T16:15:21Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:811:7000::/48 origin: AS46966 descr: Grand Island City Hall PO Box 1968 Grand Island NE 68802 United States admin-c: GOSDA-ARIN tech-c: DUEYA-ARIN tech-c: GOSDA-ARIN mnt-by: MNT-CGI-40 created: 2022-11-02T18:17:00Z last-modified: 2022-11-02T18:17:00Z source: ARIN rpki-ov-state: valid