These entries are queried from radb.net using whois, you can try my project getting these.
:AS53877 route: 199.48.64.0/22 origin: AS53877 descr: 187 Erie Street Stratford ON N5A 2V5 Canada admin-c: MCDON678-ARIN tech-c: DDE42-ARIN tech-c: JSM283-ARIN tech-c: MCDON678-ARIN tech-c: NETWO2945-ARIN tech-c: RMC42-ARIN mnt-by: MNT-RN-9 created: 2020-09-02T16:14:17Z last-modified: 2022-05-12T18:02:55Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2604:8340::/32 origin: AS53877 descr: 187 Erie Street Stratford ON N5A 2V5 Canada admin-c: MCDON678-ARIN tech-c: DDE42-ARIN tech-c: JSM283-ARIN tech-c: MCDON678-ARIN tech-c: NETWO2945-ARIN tech-c: RMC42-ARIN mnt-by: MNT-RN-9 created: 2020-09-02T16:15:07Z last-modified: 2022-05-12T18:02:55Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source