shell:$ nslookup -timeout=2 -retry=1 'groups.oist.jp'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	groups.oist.jp
Address: 23.185.0.2
Name:	groups.oist.jp
Address: 2620:12a:8000::2
Name:	groups.oist.jp
Address: 2620:12a:8001::2