shell:$ nslookup -timeout=2 -retry=1 'infoc2.duba.net'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
infoc2.duba.net	canonical name = infoc2.ksmobile.com.
Name:	infoc2.ksmobile.com
Address: 139.9.36.171
Name:	infoc2.ksmobile.com
Address: 139.9.46.163
Name:	infoc2.ksmobile.com
Address: 124.71.209.131
Name:	infoc2.ksmobile.com
Address: 139.9.45.223
Name:	infoc2.ksmobile.com
Address: 139.9.43.15
Name:	infoc2.ksmobile.com
Address: 139.9.39.206