![]() ![]() ![]() To protect your network from the outside in, a great place to start is scanning your network perimeter. Use an online port scanner to test your network perimeter What's the best way to find potentially vulnerable or problematic ports? Here we'll explore three options:ġ. Additionally, knowing which ports are open or closed can also help you troubleshoot problems with applications that require connections on a certain port. By spotting vulnerabilities before they do, you can address potential issues and reduce your risk. Scanning your network for open ports can help you stay one step ahead of hackers. 3 ways to check your network for open ports It's important to lock down all ports that don't need to be left open. Therefore, reducing the number of open ports you have helps reduce your attack surface, or number of potential weak spots, you have exposed. For example, the Domain Name Service typically uses port 53, the Simple Network Management Protocol uses ports 61 and 62, HTTPS defaults to port 443, and HTTP utilizes port 80.Īnd hackers, like thieves, actively scan for easy targets to exploit. And instead of having to keep a few dozen windows and doors locked, there are 65,535 potential ports that might be open on each computer and firewall. But in the electronic world, important data stored on PCs and servers takes the place of pricey physical goods. If just a single door or window is left open or unlocked, it would be very easy for a thief to enter and grab precious goods.Ĭomputer networks, like giant mansions, contain valuable information that hackers might target. In a house that big, there would be dozens of entry points a homeowner would have to secure. Imagine a luxurious mansion with 200 rooms packed full of valuables-a prime target for thieves. ![]()
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