shell:$ nslookup -timeout=2 -retry=1 'learn.khanacademy.org'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
learn.khanacademy.org	canonical name = prod.khan.map.fastly.net.
Name:	prod.khan.map.fastly.net
Address: 146.75.9.42