How to Change Your PC's MAC Address

What a MAC address is and why you might change it

A MAC address (Media Access Control address) is a unique identifier assigned to your network card — the hardware inside your computer that connects to the internet. It looks like six pairs of numbers and letters, such as `00:1A:2B:3C:4D:5E`. Your MAC address is different from your IP address; the IP address is what websites see, while the MAC address is what your local network (your router, your workplace network, or a coffee shop's WiFi) uses to recognize your device.

You might want to change your MAC address if you are setting up a new network, testing network configurations, or troubleshooting connection problems on a specific network. Some people also change it for privacy reasons when connecting to public networks. The change is temporary by default — your computer will revert to its original MAC address when you restart, unless you make the change permanent through your operating system settings.

Key Takeaways

Your MAC address is a hardware identifier that your local network uses to recognize your device, separate from your IP address.
On Windows, you can change your MAC address through Device Manager by editing your network adapter's advanced properties.
On macOS, you use Terminal commands to spoof your MAC address, and the change lasts until you restart your computer.
Most MAC address changes are temporary and reset when you restart; permanent changes require editing system files or driver settings.
If you are unsure whether changing your MAC address will solve your problem, contact your network administrator or IT support before making changes.

Changing your MAC address on Windows

On Windows, the most straightforward method is through Device Manager. Open Device Manager by right-clicking the Start menu and selecting it, or by typing `devmgmt.msc` into the Run dialog (Windows key + R). Expand the "Network adapters" section, then right-click the network adapter you want to modify — usually labeled something like "Ethernet" or "Wi-Fi" — and select "Properties."

In the Properties window, click the "Advanced" tab. Look for a property called "Locally Administered Address," "MAC Address," or "Network Address" in the list on the left. The exact name varies by adapter manufacturer. Click it, then select the "Value" field on the right and enter your new MAC address as twelve hexadecimal characters (0–9 and A–F) with no colons or hyphens. Click OK, then unplug and reconnect your network cable or toggle your WiFi off and back on. The change takes effect when ready.

This change persists until you restart your computer. To make it permanent, you would need to create a script that runs at startup, which requires more advanced configuration. If you restart and want to revert to your original MAC address, return to the same Advanced tab, clear the value field, and click OK.

Changing your MAC address on macOS

On macOS, you use Terminal to change your MAC address. Open Terminal (found in Applications > Utilities), then type the following command to see your current network interfaces: `ifconfig`. Look for your active connection — usually `en0` for Ethernet or `en1` for WiFi — and note its current MAC address.

To change it, type: `sudo ifconfig en0 lladdr XX:XX:XX:XX:XX:XX`, replacing `en0` with your interface name and `XX:XX:XX:XX:XX:XX` with your new MAC address in hexadecimal format. You will be prompted to enter your administrator password. After you press Enter, the change takes effect when ready. You can verify it worked by running `ifconfig` again and checking the new address.

This change lasts only until you restart your computer. When you restart, your MAC address reverts to the original. To make the change permanent on macOS requires editing system configuration files or using third-party tools, which is beyond typical user maintenance and may conflict with system security features.

Understanding what happens after you change your MAC address

Once you change your MAC address, your computer appears as a different device to your local network. If you are on a network that uses MAC filtering — a security feature that only allows specific devices to connect — you may lose your connection. If your network uses DHCP (which most do), your router will assign you a new IP address because it sees you as a new device.

Some networks, particularly corporate or school networks, track devices by MAC address. Changing yours might trigger alerts or cause you to lose access to network resources. If you are on a managed network, contact your IT department before making any changes. On your home network, changing your MAC address should not cause problems, but it may briefly interrupt your connection while your router recognizes the new address.

When to call a professional instead

If you are changing your MAC address to solve a network problem — such as a device not connecting or being blocked from a network — it is worth contacting your network administrator or IT support first. They can tell you whether a MAC address change will actually solve your issue, or whether the problem is something else entirely. Changing your MAC address when it is not the root cause wastes time and may create new problems.

If you are on a corporate, school, or managed network and want to change your MAC address for any reason, ask your IT department. Some networks have policies against MAC spoofing, and making unauthorized changes could violate those policies or trigger security alerts.

Reverting to your original MAC address

If your change was temporary (the default on both Windows and macOS), straightforward restart your computer. Your MAC address will return to its original value automatically. If you made a permanent change on Windows and want to revert it, return to Device Manager, find the Advanced tab for your network adapter, and clear the value field you edited earlier, then click OK.

On macOS, if you want to revert before restarting, you can run the `ifconfig` command again with your original MAC address, or straightforward restart the computer to reset it automatically. Keep a record of your original MAC address before you change it, so you know what to restore if needed.

Frequently Asked Questions

Will changing my MAC address hide my identity online?

No. Your MAC address is only visible to devices on your local network (your router, other computers on the same WiFi, etc.). Websites and internet services see your IP address instead. Changing your MAC address does not affect your online privacy or hide your activity from your internet service provider or websites you visit.

Can I change my MAC address to match another device's?

Technically yes, but you should not do it on the same network. If two devices have the same MAC address on the same network, both will experience connection problems because the router cannot tell them apart. This is called a MAC conflict. If you need to test with a duplicate MAC address, do it on a different network or after disconnecting the original device.

What if I change my MAC address and lose my internet connection?

Restart your computer. On Windows and macOS, a temporary MAC address change reverts automatically when you restart. If you made a permanent change on Windows and cannot reconnect, restart in Safe Mode, return to Device Manager, and clear the MAC address value you entered. If you are still unable to connect, contact your network administrator or IT support.

Do I need to change my MAC address to fix WiFi problems?

Rarely. Most WiFi problems are caused by signal strength, router settings, or driver issues — not MAC address conflicts. Before changing your MAC address, try restarting your router and computer, moving closer to the router, or updating your network drivers. If those steps do not work, contact your network administrator to determine whether a MAC address change is actually needed.

Is changing my MAC address permanent?

Not by default. On both Windows and macOS, a MAC address change lasts only until you restart your computer. To make it permanent requires additional configuration — on Windows, through startup scripts; on macOS, through system configuration files. For most users, the temporary change is sufficient for testing or troubleshooting purposes.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.