These entries are queried from radb.net using whois, you can try my project getting these.
:AS58465 route: 103.23.213.0/24 descr: Proxy-Registered-for-CSX-KH origin: AS58465 mnt-by: MAINT-AS55329 changed: vireak [at] telcotech.com.kh 20111207 #10:15:39Z source: RADB last-modified: 2023-11-13T16:19:22Z rpki-ov-state: valid route: 103.23.213.0/24 descr: Mekongnet - Campuchia origin: AS58465 mnt-by: MAINT-VDC changed: bachhm [at] vdc.com.vn 20111207 source: NTTCOM rpki-ov-state: valid route: 103.23.213.0/24 origin: AS58465 descr: Cambodia Securities Exchange CSX Building, Street Preah Mohaksat Treiyani Kossamak (St.106), Sangkat Wat Phnom, Khan Daun Penh, mnt-by: MAINT-CSX-KH last-modified: 2023-01-11T11:53:58Z source: APNIC rpki-ov-state: valid