These entries are queried from radb.net using whois, you can try my project getting these.
:AS45607 route: 123.49.56.0/24 origin: AS45607 descr: Bangladesh Telegraph & Telephone Board Telejogajog Bhaban 37/E, Eskaton Garden mnt-by: MAINT-BD-BTTB last-modified: 2020-02-13T10:32:30Z source: APNIC rpki-ov-state: valid