These entries are queried from radb.net using whois, you can try my project getting these.
:AS33273 route: 66.237.181.0/24 descr: Software Artisans, Inc. 1330 Beacon St., Suite 400 Brookline, MA 02446 US origin: AS33273 remarks: proxy-registered object for customer remarks: direct inquiries to jonathanb [at] softartisans.com mnt-by: MAINT-AS6079 changed: peter.jacoby [at] rcn.com 20050420 source: RADB last-modified: 2023-11-13T15:39:36Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source