These entries are queried from radb.net using whois, you can try my project getting these.
:AS29900 route: 66.146.240.0/20 origin: AS29900 descr: MNT-GTM-3 route 066.146.240.000/20 AS29900 admin-c: MCCAR434-ARIN tech-c: HASKI43-ARIN tech-c: MCCAR434-ARIN tech-c: PTS7-ARIN tech-c: SCHEL102-ARIN mnt-by: MNT-GTM-3 created: 2020-08-20T15:00:20Z last-modified: 2023-07-25T18:20:32Z source: ARIN rpki-ov-state: valid route: 74.51.128.0/20 origin: AS29900 descr: MNT-GTM-3 route 074.051.128.000/20 AS29900 admin-c: MCCAR434-ARIN tech-c: HASKI43-ARIN tech-c: MCCAR434-ARIN tech-c: PTS7-ARIN tech-c: SCHEL102-ARIN mnt-by: MNT-GTM-3 created: 2020-08-20T15:00:52Z last-modified: 2023-07-25T18:20:32Z source: ARIN rpki-ov-state: valid route6: 2604:d4c0::/32 origin: AS29900 descr: MNT-GTM-3 route 2604:D4C0:0000:0000:0000:0000:0000:0000/32 AS29900 admin-c: MCCAR434-ARIN tech-c: HASKI43-ARIN tech-c: MCCAR434-ARIN tech-c: PTS7-ARIN tech-c: SCHEL102-ARIN mnt-by: MNT-GTM-3 created: 2020-08-20T15:03:40Z last-modified: 2023-07-25T18:20:32Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source