My ISP just sent me over a box ("modem") and now I am online. I am afraid of beeing exposed directly to the internet.

How do I check to which level my machine is accessible from the internet?

  • 3
    I believe this is on topic because it is looking for a web application to accomplish a task, and there is a clear and great one to use, as already provided in the answers.
    – danivovich
    Jun 30, 2010 at 23:31
  • 1
    I don't understand why it was closed. Surely a web-based firewall test is a web application. Jun 30, 2010 at 23:43
  • It's not offtopic, it just needs another title like: "Web App to check my machine exposure to the internet"
    – Luis Enrique Leon
    Jul 1, 2010 at 0:25
  • Questions asking for web app recommendations are off-topic.
    – ale
    Jan 30, 2015 at 1:35
  • Now it's more a Security question Jan 30, 2015 at 7:38

1 Answer 1


Try 'Shields Up' by GRC


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