These entries are queried from radb.net using whois, you can try my project getting these.
:AS33503 route: 141.106.0.0/16 descr: Medical College of Wisconsin origin: AS33503 mnt-by: MAINT-WISCNET changed: jeffb [at] doit.wisc.edu 20110413 source: RADB last-modified: 2023-11-13T15:48:06Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:10d::/44 origin: AS33503 descr: Medical College of Wisconsin mnt-by: MAINT-WISCNET changed: wopat [at] wiscnet.net 20190820 #14:48:59Z source: RADB last-modified: 2023-11-13T15:57:04Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source