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

Non-authoritative answer:
Name:	cdn.mathjax.org
Address: 172.67.72.172
Name:	cdn.mathjax.org
Address: 104.26.13.220
Name:	cdn.mathjax.org
Address: 104.26.12.220
Name:	cdn.mathjax.org
Address: 2606:4700:20::681a:ddc
Name:	cdn.mathjax.org
Address: 2606:4700:20::681a:cdc
Name:	cdn.mathjax.org
Address: 2606:4700:20::ac43:48ac