How many ports does the computer have, and where can I open them?

Computer ports are actually represented by a 16-bit integer, so theoretically the maximum number of ports is 2 16 = 65536

The recognized is 0-1023, which is mainly some common system services such as: http service 80, mail service 25, etc.

The registered port is 1024--49152, the default port of some third-party software.

There is also a random dynamic port of 49152--65535, which can be used and controlled freely, such as when programmers need to test network communication.

A total of 65,536 ports.

The port number doesn't mean how to open it, but it depends on which of your programs needs to use that port, if you want to open a certain port.

Socket associated with the port in the program connection is sufficient.

It's about 65535 But it's generally a dozen, and the following is a brief introduction to some commonly used ports:

1) Well Known Ports: From 0 to 1023, they are tightly bound to some services. Usually the communication of these ports clearly indicates the protocol of a certain service.

For example: port 80 is actually always http communication.

2) Registered ports: from 1024 to 49151. They are loosely tied to some services.

This means that there are many services bound to these ports, and these ports are used for many other purposes as well. For example, many systems deal with dynamic ports starting at around 1024.

3) Dynamic and private ports: from 49152 to 65535. Theoretically, these ports should not be assigned to the service.

In fact, machines are usually assigned dynamic ports from 1024 onwards. But there are exceptions: SUN's RPC port starts at 32768.

Take the operation in the win10 system as an exampleSettings can be accessed via the control panel。Go to the Control PanelOpen the firewall's advanced settings and select Inbound. Click Create Rule and enter the port you want to open.

Here's how to set it up:

1. Click Start in the lower left corner of the computer and select the control panel to enter.

2. After entering the control panel interface, click Firewall.

3. Click Advanced Settings in the Firewall interface.

4. Then click the Inbound Rules button.

5. Click New Rule on the page that appears.

6. Click on the protocol and port after the page jumps, and click next after selecting the port.

7. After the page jumps, select the port rule type, enter the port to be opened and click the next button.

8. Select Allow Connection on the page that appears and click Next.

9. Select the applicable type of the port on the page that appears, and then click Next.

10. After the page jumps, enter the name of the port and click the Finish button.

11. At this time, you can see that the required port has been opened on the page that appears.