How To Find MAC Address On Your Windows Computer

What is a MAC address? MAC address stands for “media access control” address. It’s a unique identifier assigned to network interfaces. Unlike an IP address that can easily be changed, a MAC address is normally assigned by the network interface manufacturer and is used for communications on the physical network segment. It’s also known as the Physical Address.

On a Microsoft Windows machine, pull up the command prompt. On a Windows 7 machine, click on the Windows start icon, go to All Programs, then to Accessories. There you will find Command Prompt.

Once the command prompt opens, type in the following and press Enter.

ipcofig /all

You will receive something similar to this:




Your MAC or Physical Address looks like this:



On other devices such as mobile phones, iPads, and Kindles, the IP Address may appear in a similar format such as this:


There are many reasons why you might need to know your MAC address or at least know how to find it. I’ll cover a couple of those reasons in another post.

How To Change MTU Size In Windows 7

By default, the MTU (Maximum Transmission Unit) size is 1500. I’ve run into issues pulling up resources in remote regions, such as South Africa, where MTU restrictions are implemented by local ISP’s. To work around these obstacles, changing the MTU size is necessary.

To begin, ensure you’re an admin user on the computer. These instructions are assuming you are using your Local Area Connection for your connection which is most likely a Cat5 cable.

1. Open a command line window as an Administrator (ie. right click on All Programs > Accessories > Command Prompt and select Run as administrator)
2. Type the command netsh and wait for prompt
3. Type the command interface and wait for prompt
4. Type the command ipv4 and wait for prompt
5. Type the command set subinterface “Wireless Network Connection” mtu=1300

Leave the command prompt up so you can change it back to 1500 when you are done. There are troubleshooting steps to take to see if you are having an MTU size issue that I will cover in another post. Come back and search regularly.

Open Command Prompt As An Administrator In Windows

This post describes how to open a command prompt with full administrator permissions in the following Windows Operating Sytems:

Windows 7, Windows Essential Business Server, Windows SBS 2003, Windows SBS 2008, Windows Server 2000, Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2, Windows Server 2008, Windows Server 2008 R2, Windows Vista


To open a command prompt as an administrator,

1. Click Start, click All Programs, and then click Accessories.
2. Right-click Command prompt, and then click Run as administrator.

If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.