shell:$ nslookup -timeout=2 -retry=1 '11.udemy.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	11.udemy.com
Address: 104.16.143.237
Name:	11.udemy.com
Address: 104.16.142.237
Name:	11.udemy.com
Address: 2606:4700::6810:8eed
Name:	11.udemy.com
Address: 2606:4700::6810:8fed