shell:$ nslookup -timeout=2 -retry=1 'portal-iot.vodacom.co.tz'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
portal-iot.vodacom.co.tz	canonical name = 5s8d6xx.ng.impervadns.net.
Name:	5s8d6xx.ng.impervadns.net
Address: 45.60.73.192