These entries are queried from radb.net using whois, you can try my project getting these.
:AS328243 route: 156.0.76.0/24 descr: root-ipv4 origin: AS328243 mnt-by: RTOS1-MNT changed: *** [at] rootnetworks.com 20180711 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 156.0.77.0/24 descr: root-ipv4 origin: AS328243 mnt-by: RTOS1-MNT changed: *** [at] rootnetworks.com 20180711 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 156.0.78.0/24 descr: root-ipv4 origin: AS328243 mnt-by: RTOS1-MNT changed: *** [at] rootnetworks.com 20180711 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 156.0.79.0/24 descr: root-ipv4 origin: AS328243 mnt-by: RTOS1-MNT changed: *** [at] rootnetworks.com 20180711 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2c0f:f1f8::/32 descr: rootnetworks-ipv6 origin: AS328243 mnt-by: RTOS1-MNT changed: *** [at] rootnetworks.com 20180711 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source