To put it simply, a port number is the means through which a specific message is identified when it’s forwarded to a server. As there are 65,535 ports for each IP address, a specific designation would refer to one or several of those thousands of ports. Depending upon the service type, the message will either be associated with a TCP or a UDP port.
TCP stands for Transmission Control Protocol and sends the data after establishing a connection. which makes it more reliable than UDP for data transfers. On the other hand, UDP stands for User Datagram Protocol and sends data packets connection-less which makes it lightweight and significantly faster than TCP. You don’t really need to be particularly concerned with the details of TCP versus UDP here; port forwarding might apply to TCP or UDP, though..
Here, we’ll show you the steps to find the ports open or in use on your computer:
Command Promptby typing
cmdin the search box.
ipconfigat the prompt This provides you with some outputs about your IP address. Note that if you are behind a router, you may not see your public IP. You may instead see a router IP, such as 192.168.1.1 or 192.168.2.31. If you want your public IP, you can go to What is my IP.
netstat -afor a list of connections and port numbers that are currently being used. Note that the output of this will take a good ten minutes or so.
System Preferencesby clicking on the Apple icon.
IP addressyou want to scan. If you need to know your IP address, go to What is my IP.
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A computer network is made up of a collection of devices – such as routers, printers, laptops, and cameras – that are connected together for sharing data and resources.
Each device within the network has a unique numerical label allocated to it, known as the Internet Protocol (IP) address. This helps with two main functions:
A port number works in tandem with the IP address to direct specific traffic to a specific destination on a network. This can be done to optimize performance or to grant access altogether, as in the case of a web server. If the webserver port wasn’t open, you wouldn’t be able to run one, and people wouldn’t be able to connect to you.
The following are answers to some of the most frequently asked questions about port numbers.
An IP address is simply an address on the internet. Just like homes have addresses, so do computers connected to the internet.
There are two types of IP addresses: public and private. The private IP is the address allocated to your device by your router. The public IP address is provided by your ISP and it is the address that allows you to explore the internet. You can easily check your IP address via an IP lookup tool. Visit the IP lookup tool, and it will show your public IP address as well as IP location, ISP and even operating system.
All you have to do is type “netstat -a” on Command Prompt and hit the Enter button. This will populate a list of your active TCP connections. The port numbers will be shown after the IP address and the two are separated by a colon. For instance, if your IP address is something like 192.168.45.2 and you’re being displayed an entry for 192.168.45.2:57961, it means the port number 57961 is open and possibly in use.
Basically, a port scanner probes a host or server for open ports. These applications are commonly used by administrators to verify network security policies (but usually to see that ports are CLOSED, not open). In fact, even hackers use port scanners to identify open ports on a host so they can exploit any vulnerabilities attributed to those open ports.
There are many port checking tools available on the internet that allow you to check your public (external) IP address and detect if there are any open ports associated with your IP address. This can help you in checking if port forwarding has been set up correctly on your router, or if a firewall is getting in the way of your server applications.