These entries are queried from radb.net using whois, you can try my project getting these.
:AS138585 route: 157.20.57.0/24 descr: OffTechIT Bangladesh country: BD mnt-by: MAINT-FBI-BD mnt-routes: MAINT-FBI-BD origin: AS138585 last-modified: 2024-02-16T11:23:28Z source: APNIC rpki-ov-state: valid route6: 2404:53c0::/32 descr: OffTechIT Bangladesh origin: AS138585 mnt-by: MAINT-OFFTECHITBD-BD country: BD last-modified: 2019-02-05T06:22:01Z source: APNIC rpki-ov-state: valid