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

Non-authoritative answer:
www.coursera.org	canonical name = www-cloudfront-alias.coursera.org.
Name:	www-cloudfront-alias.coursera.org
Address: 108.156.91.129
Name:	www-cloudfront-alias.coursera.org
Address: 108.156.91.81
Name:	www-cloudfront-alias.coursera.org
Address: 108.156.91.23
Name:	www-cloudfront-alias.coursera.org
Address: 108.156.91.125