These entries are queried from radb.net using whois, you can try my project getting these.
:AS399036 route: 208.52.142.0/24 origin: AS399036 descr: SDNET on behalf of XIGENT-SOLUTIONS notify: peering [at] sdncommunications.com mnt-by: MAINT-AS13576 changed: dave.halter [at] sdncommunications.com 20210526 #13:43:38Z source: RADB last-modified: 2023-11-13T16:05:47Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source