These entries are queried from radb.net using whois, you can try my project getting these.
:AS393902 route: 192.138.0.0/24 descr: Proxy Registration for MicroIntegration remarks: Proxy Registered by ServerCentral origin: AS393902 mnt-by: MAINT-SERVERCENTRAL changed: neteng [at] servercentral.com 20150916 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source