How to Change Your Hardware Address (MAC Address)

What a hardware address is and why you might change it

Your hardware address, also called a MAC address (Media Access Control address), is a unique identifier built into your network card — the physical device that connects your computer or phone to the internet. It looks like six pairs of numbers and letters, such as 00:1A:2B:3C:4D:5E. Your router uses this address to recognize your device on the local network.

You might change your hardware address to troubleshoot connection problems, test network security, bypass a device limit on your WiFi network, or replace a network card that has failed. The process differs depending on whether you use Windows, macOS, or Linux, and whether you want to change it temporarily (until you restart) or permanently.

Key Takeaways

A hardware address is a unique identifier assigned to your network card that your router uses to recognize your device.
Temporary changes last only until you restart your computer; permanent changes require editing system files or using driver software.
On Windows, you can change your MAC address through Device Manager or the Registry, depending on your network card manufacturer.
On macOS and Linux, command-line tools like ifconfig or ip link allow temporary changes without restarting.
Some network cards do not support MAC address changes, and changing it may violate your internet service provider's terms of service.

Changing your hardware address on Windows

The easiest method on Windows is through Device Manager if your network card driver supports it. Open Device Manager by right-clicking the Start button and selecting Device Manager. Locate your network adapter under "Network adapters," right-click it, and select Properties. Look for an "Advanced" tab. If your driver includes a MAC address field (often labeled "Locally Administered Address," "Network Address," or "Physical Address"), you can enter a new address there. Type a valid MAC address — it must be 12 hexadecimal characters (0–9 and A–F), usually formatted as six pairs separated by hyphens or colons. Click OK and restart your computer for the change to take effect.

If your network card driver does not expose this option in Device Manager, you can edit the Windows Registry directly, though this method carries more risk if you make a mistake. Open the Registry Editor by pressing Windows key + R, typing regedit, and pressing Enter. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}. This folder contains entries for each network adapter. Open each one until you find the correct adapter (check the DriverDesc value to confirm). Right-click in the empty space, select New > String Value, and name it NetworkAddress. Set its value to your new MAC address without hyphens or colons — for example, 001A2B3C4D5E. Restart your computer. If the change does not work, delete the NetworkAddress entry and try a different network adapter folder.

Changing your hardware address on macOS

On macOS, you can change your MAC address temporarily using the Terminal without restarting. Open Terminal (found in Applications > Utilities) and type the following command, replacing en0 with your network interface name if different:

sudo ifconfig en0 lladdr 00:1A:2B:3C:4D:5E

Press Enter and enter your administrator password when prompted. The change takes effect when ready. To verify it worked, type ifconfig en0 and look for the "lladdr" line. This change lasts only until you restart your computer or disconnect from the network. To make the change permanent, you must create a script that runs at startup. Create a new file in Terminal using a text editor like nano, paste the ifconfig command into it, save it, and configure it to run automatically through System Preferences > General > Login Items or by creating a LaunchAgent. Most macOS users find the temporary method sufficient for troubleshooting.

Changing your hardware address on Linux

Linux offers the most straightforward temporary change using the command line. Open a terminal and type:

sudo ip link set dev eth0 address 00:1A:2B:3C:4D:5E

Replace eth0 with your actual network interface name (find it by typing ip link show). The change takes effect when ready and lasts until you restart. To make it permanent, edit your network configuration file. On Ubuntu and Debian systems, open /etc/netplan/ and edit the YAML file for your connection. Add the line macaddress: 00:1A:2B:3C:4D:5E under your interface settings, then run sudo netplan explore. On systems using NetworkManager, you can set the MAC address through the GUI by opening Settings > Network, selecting your connection, clicking the gear icon, and entering the address in the Cloned MAC Address field.

Choosing a valid MAC address

When you create a new hardware address, it must follow specific rules or your network will reject it. A valid MAC address is 48 bits long, displayed as six pairs of hexadecimal digits (0–9, A–F). The first pair determines whether the address is universally administered (assigned by the manufacturer) or locally administered (assigned by you). If you want to avoid conflicts with real devices, set the second digit of the first pair to an odd number — for example, 02:1A:2B:3C:4D:5E or 0A:1A:2B:3C:4D:5E. This marks it as locally administered.

The remaining ten digits can be any hexadecimal characters. Avoid copying a MAC address from another device on the same network, as duplicate addresses cause connection conflicts. If you are unsure whether your new address is valid, use an online MAC address generator tool to create one that follows the correct format.

Common problems and what to do about them

If your network card does not support MAC address changes, the option will not appear in Device Manager or the driver settings. This is common with older network cards or those with locked firmware. Your only option is to replace the network card with one that supports the feature. If you changed your MAC address and now cannot connect to the internet, restart your computer to revert to the original address (on Windows and macOS) or manually enter the original address using the same command you used to change it.

Some internet service providers monitor MAC addresses and may block your connection if you change it, especially if you are trying to bypass a device limit on your account. Check your service agreement before making permanent changes. If your router has a device limit and you are trying to add another device, contact your provider to increase the limit rather than spoofing a MAC address — this is faster and does not violate terms of service.

When to change your hardware address and when not to

Change your hardware address to troubleshoot network problems (such as a device that will not connect despite correct password entry), test whether your router is filtering by MAC address, or replace a failed network card and need to register the new one with your network. Do not change it to bypass security on a network you do not own, to evade monitoring, or to exceed device limits set by your internet service provider — these uses may violate laws or service agreements.

If you are testing network security on your own equipment, document what you are doing and revert the change when testing is complete. Keep a record of your original MAC address before you make any changes, so you can restore it if something goes wrong.

Frequently Asked Questions

Will changing my hardware address affect my internet speed?

No. Your MAC address is used only on your local network to identify your device to the router. It does not affect how fast data travels to and from the internet. If you changed your MAC address and your speed dropped, the cause is likely something else — check that you are still connected to the correct network and that your router is functioning normally.

Can I change my hardware address on my phone?

Most phones do not allow you to change your MAC address through the settings menu. Some Android phones with developer options enabled can change it temporarily using ADB (Android Debug Bridge) commands, but the change reverts after restart. iPhones do not support MAC address changes at all.

What happens if I use the same MAC address on two devices?

Both devices will have connection problems because your router cannot tell them apart. It may drop one connection, alternate between them, or block both. If you accidentally create a duplicate, change one of the addresses to something unique. If you are testing and need to revert, restart the device or manually enter a different address.

Is changing my hardware address illegal?

Changing your own MAC address on your own device is legal. Using a changed MAC address to bypass security on a network you do not own, evade monitoring, or violate a service agreement may be illegal depending on your location and the circumstances. Check your internet service provider's terms of service and local laws before making permanent changes.

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.