These entries are queried from radb.net using whois, you can try my project getting these.
:AS327775 route: 196.49.6.0/24 descr: The Angola Internet Exchange Point origin: AS327775 mnt-by: ANGOLA-IXP-MNT changed: *** [at] gmail.com 20180209 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source