shell:$ nslookup -timeout=2 -retry=1 'ia-mailgw.apnic.net'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	ia-mailgw.apnic.net
Address: 203.119.110.25
Name:	ia-mailgw.apnic.net
Address: 2001:dd8:a:851::25