How do I know the physical address of the previous NIC after changing the NIC?

Click on the icon (two small monitors) in the lower left corner of your computer connected to the Internet

Select Support

Click "Details".

The first line is the NIC address.

Start - > open "regedit" where you run

The registry was opened.

Find it in the menu, find it in it, enter the new card address in it, and when you find it, you may find that there are two addresses, one is now, and the other may be your old card address.

The original card is gone.

Ask the school administrator, there's no good way to ask him to help you rebind. Even if you know that you will.

Modify the physical Mac

The physical address of the NIC is the actual address corresponding to the storage unit in the memory, also known as the physical address, which corresponds to the logical high-resolution address.

A MAC (MediaAccessControl) address is an identifier that identifies a LAN (Local Area Network) node. The physical address of a network card is usually the EPROM (a flash memory chip, usually written by a program) burned into the network card by the network card manufacturer, which stores the addresses of the computer that really identifies the computer that sent the data and the host that received the data when transmitting data.

Main applications:That is to say, in the physical transmission process at the bottom of the network, the host is identified by the physical address, which is generally unique in the world. For example, the physical address size of a well-known Ethernet card is 48 bits (bits), the first 24 bits are the manufacturer number, and the last 24 bits are the NIC number, such as: 44-45-53-54-00-00, which is stored in the host interface in a machine-readable way.

The Ethernet Address Management Organization (IEEE) divides Ethernet addresses, that is, different combinations of 48 bits, into several independent contiguous address groups, and manufacturers of Ethernet network cards purchase one of them, and assign unique addresses to Ethernet cards one by one during specific production.

Method 1: Press the shortcut key [Win+R] to bring up the running tool. Then type cmd, press enter, or click OK.

2. Enter the command prompt and then enter (ipconfig all) to input back. As you can see in the figure below, you can see the wired and MAC addresses on this computer.

In the second method, press the [Windows] + [R] keys at the same time to open and run, enter [cmd], and click [OK];

Enter [ipconfig all] in the command dialog box that opens, and then press the enter key, and you can see the physical address.

That is to say, in the physical transmission process at the bottom of the network, the host is identified by the physical address, which is generally unique in the world. For example, the well-known Ethernet card, whose physical address is a 48-bit integer, is stored in a machine-readable way in the host interface. The Ethernet Address Management Authority (IEEE) divides Ethernet addresses, that is, different combinations of 48 bits, into several independent contiguous address groups, and the manufacturer of the Ethernet interface board purchases one of the groups, and gives the unique addresses to the interface board (Ethernet card) one by one.

Therefore, the physical address of the NIC corresponds to the actual signal transmission process.

It can be modified. However, it is not recommended to modify it. Unknown issues may result.