shell:$ nslookup -timeout=2 -retry=1 'public.dns.iij.jp'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	public.dns.iij.jp
Address: 103.2.57.6
Name:	public.dns.iij.jp
Address: 103.2.57.5
Name:	public.dns.iij.jp
Address: 2001:300::5
Name:	public.dns.iij.jp
Address: 2001:300::6