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

Non-authoritative answer:
Name:	classeroom.com
Address: 173.239.8.164
Name:	classeroom.com
Address: 74.206.228.78
Name:	classeroom.com
Address: 173.239.5.6