These entries are queried from radb.net using whois, you can try my project getting these.
:AS398923 route: 136.175.186.0/24 origin: AS398923 descr: Maine Public Employee Retirement System admin-c: MAVOD2-ARIN tech-c: HARDI245-ARIN tech-c: MAVOD2-ARIN mnt-by: MNT-MPERS-1 created: 2021-02-19T19:57:12Z last-modified: 2021-02-19T19:57:12Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source