shell:$ nslookup -timeout=2 -retry=1 'mobile-oneapp.celcom.com.my'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	mobile-oneapp.celcom.com.my
Address: 203.82.71.123
Name:	mobile-oneapp.celcom.com.my
Address: 183.171.255.19