In this tutorial we will discuss the concept of Ports and how they work with IP addresses. If you have not read our article on IP addresses and need a brush up, you can find the article here.

Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port ...

but instead of delivering those datagrams "to a computer," there's an added layer of addressing that says which application is interested in them (and like TCP, UDP does this with a port number).

Whether you're browsing the internet, streaming videos, or troubleshooting network issues, underlying networking protocols such as TCP/IP, UDP, and ICMP are responsible for the smooth transmission of ...

Show Local Connection will open current active UDP port connection and a user can select any such running process and read the basic information about the process ID and the Protocol (TCP ...

The tool reports the port status of TCP and UDP ports on a computer that you select. This post will show you how to use the Port Query tool for network reconnaissance or forensic activity.

Data packets travel to and from numbered network ports associated with particular IP addresses and endpoints, using the TCP or UDP transport layer protocols. All ports are potentially at risk of ...

See UDP and TCP/IP port. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

While practically any TCP and UDP port can be used for a particular application, this list is a good starting point and while the list is not complete, we recommend looking it over to get a sense ...

If your app is using bog-standard OpenVPN - or even some proprietary protocols, such as ExpressVPN's Lightway - you might find it gives you both UDP and TCP options. You may like Can fast be faster?