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

Non-authoritative answer:
Name:	optus.com.au
Address: 23.55.242.146
Name:	optus.com.au
Address: 23.55.242.130
Name:	optus.com.au
Address: 23.55.242.147
Name:	optus.com.au
Address: 23.55.242.123
Name:	optus.com.au
Address: 23.55.242.152
Name:	optus.com.au
Address: 23.55.242.122
Name:	optus.com.au
Address: 23.55.242.121
Name:	optus.com.au
Address: 23.55.242.138
Name:	optus.com.au
Address: 23.55.242.161