These entries are queried from radb.net using whois, you can try my project getting these.
:AS23873 route: 203.146.182.0/24 descr: CSLoxinfo route object for Tri Petch Isuzu origin: AS23873 mnt-by: MAINT-AS4750 changed: bgpadmin [at] noc.loxinfo.co.th 20030804 source: RADB last-modified: 2023-11-13T15:39:33Z rpki-ov-state: valid