shell:$ nslookup -timeout=2 -retry=1 'ob2.optus.com.au'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
ob2.optus.com.au	canonical name = optusbusiness.mktoweb.com.
optusbusiness.mktoweb.com	canonical name = customer-pages-sn05.mktocloud.com.
Name:	customer-pages-sn05.mktocloud.com
Address: 104.18.17.34
Name:	customer-pages-sn05.mktocloud.com
Address: 104.18.16.34