shell:$ nslookup -timeout=2 -retry=1 'portal.ncnd.robi.com.bd'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
portal.ncnd.robi.com.bd	canonical name = robi.portal.ncnd.mobi.
robi.portal.ncnd.mobi	canonical name = robi.ncnd.mobi.
Name:	robi.ncnd.mobi
Address: 63.32.11.13
Name:	robi.ncnd.mobi
Address: 54.171.103.231
Name:	robi.ncnd.mobi
Address: 18.203.181.3
Name:	robi.ncnd.mobi
Address: 18.203.3.79