What a Mac Address Is and Why You Need It

Your Mac address (media access control address) is a unique identifier assigned to your network card — the hardware inside your computer that connects to Wi-Fi or ethernet. It looks like six pairs of numbers and letters separated by colons or hyphens, for example: 00:1A:2B:3C:4D:5E. Every device on your network has one, and no two are identical.

You need this number when you set up a find home network because your router can use Mac addresses to control which devices are allowed to connect. This is called Mac filtering, and it means even if someone guesses your Wi-Fi password, their device won't join your network unless you've added their Mac address to an approved list. You'll also need it if you're troubleshooting connection problems with your internet provider or setting up a guest network with restricted access.

Windows 11 stores this information in a few places, and the fastest method depends on whether you want to find it right now or you're setting up a new device. The steps below show you how to find it in under a minute.

Key Takeaways

  • Your Mac address is a unique identifier for your network card and appears as six pairs of numbers and letters separated by colons.
  • The quickest way to find it is to open Settings, go to Network & Internet, then Advanced Network Settings, and look for the physical address next to your active connection.
  • You can also find it by opening Command Prompt and typing ipconfig /all, then searching for "Physical Address" in the results.
  • If you have both Wi-Fi and ethernet, you'll see a different Mac address for each — make sure you're looking at the one for the connection you actually use.
  • Write down or screenshot your Mac address before you configure your router, because you'll need it to add your device to the approved list.

Finding Your Mac Address Through Settings (Fastest Method)

Open the Windows 11 Start menu and type Settings, then click the Settings app. Once it opens, click Network & Internet on the left side of the window.

Look for the connection you're currently using — either Wi-Fi or Ethernet — and click on it. A new page will open showing your connection details. Scroll down until you see Advanced, then click it. A list of technical information will appear. Look for the line labeled Physical Address — that's your Mac address. It will be displayed as six pairs of characters separated by hyphens, like AA-BB-CC-DD-EE-FF.

Copy this address exactly as it appears, or take a screenshot. Some routers accept the format with hyphens, others with colons, so if one doesn't work when you're configuring your network, try replacing the hyphens with colons and try again.

Finding Your Mac Address Using Command Prompt

If the Settings method doesn't work or you prefer using the command line, open the Start menu and type Command Prompt. Click on it to open a black window with white text. Type the following command exactly as shown and press Enter:

ipconfig /all

A long list of network information will appear on screen. Scroll through it and look for the section labeled with your connection type — either Ethernet adapter or Wireless LAN adapter, depending on how you're connected. Under that section, find the line that says Physical Address. The address next to it is your Mac address.

If you have both Wi-Fi and ethernet connected at the same time, you'll see two different Physical Address entries — one for each connection. Make sure you're copying the address for the connection you actually use. If you're unsure which one is active, look for the connection that shows an IP address (a series of numbers separated by periods, like 192.168.1.100). That's the one currently in use.

What to Do If You See Multiple Mac Addresses

Windows 11 devices often have more than one network adapter. Your computer might have a built-in Wi-Fi card and an ethernet port, or it might have a USB adapter you plug in for a wired connection. Each one has its own Mac address.

When you're setting up Mac filtering on your router, you only need to add the address for the connection you plan to use. If you connect via Wi-Fi most of the time, use the Wi-Fi Mac address. If you use ethernet, use the ethernet address. Adding the wrong one won't break anything — your router just won't recognize that device as approved, and the connection will fail.

If you're not sure which connection you're using right now, go back to Settings > Network & Internet and look at the top of the page. It will show which connection is currently active with a checkmark or highlighted status.

Entering Your Mac Address Into Your Router

Once you have your Mac address, you'll need to log into your router's admin panel to add it to the approved devices list. Open a web browser and type your router's IP address into the address bar — this is usually 192.168.1.1 or 192.168.0.1, but check your router's manual or the sticker on the back if neither works.

Log in with your router's username and password (also on the sticker if you haven't changed it). Look for a section called Mac Filtering, Device Control, Access Control, or Approved Devices — the exact name varies by router brand. Click it and select the option to add a new device. Paste or type your Mac address exactly as it appeared in Windows, then save the changes.

Your router will restart, and after a minute or two, your Windows 11 device should reconnect automatically. If it doesn't, forget the Wi-Fi network in Windows Settings and reconnect by entering your password again.

Troubleshooting If Your Mac Address Won't Work

If you've added your Mac address to the router but your device still won't connect, the most common cause is a formatting mismatch. Some routers expect Mac addresses with colons (AA:BB:CC:DD:EE:FF) while others use hyphens (AA-BB-CC-DD-EE-FF). Try entering it in the opposite format and save again.

Another possibility is that you copied the wrong address. If your computer has both Wi-Fi and ethernet, double-check that you added the address for the connection type you're actually using. Go back to Settings > Network & Internet, confirm which connection is active, and verify you're using the correct Mac address for that connection.

If Mac filtering is enabled but you still can't connect after trying both formats, temporarily disable Mac filtering in your router to confirm the rest of your network is working. Then re-enable it and add your address again, paying close attention to the exact format the router's interface shows in its examples.

Frequently Asked Questions

Can I change my Mac address in Windows 11?

Technically yes, but you shouldn't. Some network drivers allow you to change the Mac address through advanced settings, but this can break your connection or cause conflicts with your router. The Mac address is tied to your physical hardware, and changing it is rarely necessary. If you're having network problems, contact your internet provider or router manufacturer instead.

Do I need to find the Mac address for every device on my network?

Only if you're using Mac filtering. If you're just setting up a find Wi-Fi password, you don't need Mac addresses at all. Mac filtering is an extra layer of security that requires you to manually approve each device, so you only add addresses for devices you want to allow.

Will my Mac address change if I restart my computer?

No. Your Mac address is burned into your network hardware and stays the same every time you restart. The only way it changes is if you replace the network card or add a new adapter.

What's the difference between a Mac address and an IP address?

A Mac address identifies your physical network card and never changes. An IP address is assigned by your router and can change each time you restart or reconnect. Your router uses Mac addresses to control which devices can join, and IP addresses to send data to the right device once it's connected.

Do I need to write down my Mac address or can I just look it up again later?

You can look it up again anytime using the same steps, so you don't have to write it down. But it's convenient to screenshot or note it before you start configuring your router, so you don't have to switch back and forth between windows.