What is the MAC address? How do I check the computer MAC address?

What is the MAC address?

A Mac (Media Access Control) address, called a Mac location, or hardware site, used to define the position of a network device. In the OSI model, the third layer of the network layer is responsible for the IP address, and the second layer of the data link layer is responsible for the Mac site. So a host will have an IP address, and each network location will have a specially owned MAC address

what is the format of the MAC address?

Ethernet Card MAC address is a group of 48 bits of the number, the 48 bits are divided into two parts, the front 24 bits to represent the host of Ethernet card, the back of the 24 bit is a set of serial number, is the host of the tribe. This will guarantee that no two network card MAC address is the same (of course, it can be implemented in a special way). If the same address appears, there will be a problem, all of which is very important. These 24 bits are called Oui (organizationally Unique Identifier).

However, the true length of the Oui is only 22 bits, and two bits are used for the other: a bit is used to verify whether it is a broadcast or multicast address, and the other bits are used to allocate local execution addresses (some networks allow administrators to assign MAC addresses to specific situations).

For instance, your MAC address is represented on the network as 03 00 00 00 00 01. The first byte contains a value binary representation method of 00000011.
As you can see, the last two bits are set to the truth. He specifies a multicast mode, broadcasts to all computers, and uses the "NetBEUI" protocol (typically, in a Windows computer network, file sharing transfers are not used with TCP/IP protocol).

How to check the computer MAC address?

Method One, view the computer physical MAC address through the command line

1. First hold down the "Start key +r" on the keyboard, and then enter "CMD" in the dialog box that pops up.

2. You can also click Start > All Programs > Attachments > Command Prompt in turn

3. Next in the pop-up Command Prompt window, enter "Ipconfig/all" and press Enter on the keyboard (note: The ipconfig command to view IP configuration information, parameter "All" means to view all the configuration information for all network adapters) as shown in the following figure

4. Then find their own physical network card, in the network card below that is the physical address of the network card, as shown in the following figure

Method Two, view through the network center of the system

1. First find the system in the lower right corner of the taskbar "Network Display Icon", and click the left mouse button, as shown in the following image

2. Next in the pop-up Network Information display window, click "Open Network and Sharing Center", as shown in the following figure

3. Then in the New pop-up window, click "Change adapter Settings" On the left, as shown in the following image

4. Next in the Network Connection window, find the NIC we want to view and double-click to open it. Here I take my local physical network card as an example, as shown in the following figure

5. Next you will see some general information of this network card, we then click "Details" in the window, as shown in the following figure

6. Finally, in the details attribute, we can find the physical MAC address of the NIC, as shown in the following figure

Mobile MAC address how to view

1. Under the Standby page, click "Application"-"Settings"-"Slider"-"WLAN"-Press the "menu" in the lower left corner of the screen-"Advanced Settings" (Here is a Samsung Android phone for example)

Can MAC address be modified?

MAC address Before I met the last ARP attack I always thought that the computer's MAC address is not modifiable, but the last time I encountered an ARP attack found that the MAC address can also be modified.