These entries are queried from radb.net using whois, you can try my project getting these.
:AS46281 route: 206.41.8.0/23 descr: ContendoAS46281 origin: AS46281 mnt-by: AS46281-MNT changed: nicholas.etnoyer [at] level3.com 20101119 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.93.136.0/24 descr: Cotendo Inc. origin: AS46281 admin-c: COTENDO-RADBADMIN tech-c: COTENDO-NOC mnt-by: MAINT-COTENDO notify: radbadmin [at] cotendo.com changed: victor [at] cotendo.com 20101111 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 213.19.152.0/24 descr: Contendo Route origin: AS46281 mnt-by: BANDCON-MNT changed: jim.farley [at] level3.com 20081009 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source