shell:$ nslookup -timeout=2 -retry=1 'alkst.robi.com.bd.prod.hosts.ooklaserver.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
alkst.robi.com.bd.prod.hosts.ooklaserver.net	canonical name = alkst.robi.com.bd.
Name:	alkst.robi.com.bd
Address: 58.145.187.166