What a Mac Address Is and Why You Might Change It

A MAC address (Media Access Control address) is a unique identifier assigned to every network device — your laptop, phone, or router. It looks like a string of six pairs of numbers and letters, such as 00:1A:2B:3C:4D:5E. Your device uses this address to communicate on a local network, separate from your IP address.

Changing your MAC address is called spoofing. People do this for several reasons: to test network security, to bypass a device limit on a shared network, to troubleshoot connection problems, or to protect privacy on public WiFi. The change is temporary — it resets when you restart your device — unless you make it permanent through your operating system settings.

This guide covers how to change your MAC address on Windows, macOS, and Linux, and what to expect at each step.

Key Takeaways

  • MAC address changes are temporary by default and reset when you restart your device, unless you configure a permanent change in your network settings.
  • Windows users can change a MAC address through Device Manager by editing the network adapter's advanced properties, a process that takes about five minutes.
  • macOS users must use Terminal commands to spoof a MAC address, and the change applies only until the next restart.
  • Linux users have the most control and can change a MAC address using command-line tools like ifconfig or ip, with options to make the change permanent.
  • After changing your MAC address, disconnect and reconnect to your network to confirm the change took effect.

How to Change Your Mac Address on Windows

On Windows, the easiest method is through Device Manager. Open Device Manager by right-clicking the Start menu and selecting it, or by typing "Device Manager" into the search bar. Expand the "Network adapters" section to see your network devices.

Right-click the network adapter you want to change — usually labeled "Ethernet" or "WiFi" — and select "Properties". Click the "Advanced" tab. In the property list, look for an entry called "Locally Administered Address", "Network Address", or "MAC Address" (the exact name varies by adapter). Highlight it and check the "Value" field on the right. If it is blank or shows a default value, click in the value box and type your new MAC address without colons or hyphens — for example, 001A2B3C4D5E. Click "OK" and restart your network adapter by disabling and re-enabling it in Device Manager, or restart your computer.

Not all network adapters support this method. If you do not see a "Network Address" property, your adapter does not allow MAC spoofing through Device Manager. In that case, you will need third-party software or command-line tools.

How to Change Your Mac Address on macOS

macOS does not provide a graphical interface for MAC address changes. You must use Terminal, the command-line tool built into every Mac. Open Terminal by pressing Command + Space, typing "Terminal", and pressing Enter.

First, find your network interface name. Type ifconfig and press Enter. Look for the interface you want to change — usually en0 for Ethernet or en1 for WiFi. Note the name exactly.

Next, disconnect from the network. Click the WiFi icon in the menu bar and select "Turn WiFi Off", or unplug your Ethernet cable. In Terminal, type sudo ifconfig en0 lladdr 00:1A:2B:3C:4D:5E, replacing en0 with your interface name and 00:1A:2B:3C:4D:5E with your new MAC address. Press Enter and type your Mac password when prompted. Reconnect to the network. The change lasts until you restart your Mac.

To make the change permanent on macOS, you must create a script that runs at startup. This is more complex and requires editing system files. Most users find the temporary change sufficient.

How to Change Your Mac Address on Linux

Linux offers the most flexibility for MAC address changes. The method depends on whether your system uses ifconfig or the newer ip command. Open a terminal and type ifconfig. If the command is recognized, follow the ifconfig method below. If not, use the ip method.

Using ifconfig: Type sudo ifconfig eth0 down to disable the interface (replace eth0 with your interface name). Then type sudo ifconfig eth0 hw ether 00:1A:2B:3C:4D:5E, replacing the MAC address with your new one. Type sudo ifconfig eth0 up to re-enable it. The change is temporary.

Using ip: Type sudo ip link set dev eth0 down, then sudo ip link set dev eth0 address 00:1A:2B:3C:4D:5E, then sudo ip link set dev eth0 up. Again, replace eth0 and the MAC address with your own values.

To make the change permanent on Linux, edit your network configuration file. The location varies by distribution — on Ubuntu, it is usually /etc/netplan/. Add a line specifying the MAC address in your netplan YAML file, save it, and run sudo netplan explore. If you are unfamiliar with editing configuration files, the temporary method is safer.

What Happens After You Change Your Mac Address

After you change your MAC address, your device appears as a new device on the network. If you are connected to WiFi, disconnect and reconnect to force your router to recognize the new address. If you are on Ethernet, unplug and replug the cable. Your router will assign a new IP address if it uses DHCP, which is the default on most home networks.

Some networks use MAC filtering — a whitelist of allowed devices. If your network does this and your new MAC address is not on the list, you will lose network access. Check with your network administrator before changing your address on a managed network.

If you changed your MAC address to troubleshoot a connection problem and the problem persists, change it back to the original. You can find your original MAC address by checking your device's system information or by contacting the manufacturer.

When a Mac Address Change Does Not Work

If your MAC address does not change, the most common cause is that your network adapter does not support spoofing. Some adapters, particularly older ones or those in enterprise environments, have this restriction built in at the hardware level.

Another cause is insufficient permissions. On Windows, you must run Device Manager as administrator. On macOS and Linux, you must use sudo and enter your password. If you skipped this step, the command will fail silently or show a permission error.

A third cause is that you are trying to change the address while the interface is in use. Always disable the network adapter or disconnect from the network before attempting the change. On Linux, the down command handles this automatically, but on Windows and macOS you must do it manually.

Frequently Asked Questions

Will changing my MAC address hide my identity online?

No. A MAC address is only used on your local network — between your device and your router. Websites and internet services see your IP address instead, which is assigned by your internet service provider. Changing your MAC address does not affect your IP address or your online privacy. To hide your IP address, you would need a VPN or proxy service.

Can I change my MAC address on my phone?

Most phones do not allow manual MAC address changes through their settings. Some Android phones with developer mode enabled can change their MAC address, but the process varies by manufacturer and Android version. iPhones do not provide any method to change the MAC address. If you need to change a phone's MAC address, check your phone's documentation or contact the manufacturer.

Is changing my MAC address illegal?

Changing your MAC address itself is not illegal. However, using a spoofed MAC address to bypass network security, gain unauthorized access to a network, or evade monitoring may be illegal depending on your location and the network's policies. Always check with your network administrator before changing your MAC address on a network you do not own.

How do I find my original MAC address if I forgot it?

On Windows, open Command Prompt and type getmac. On macOS, open System Preferences, go to Network, select your connection, and click "Advanced" — the MAC address is listed under "Hardware". On Linux, type ifconfig or ip link show. If you have already changed it and cannot remember the original, contact your device manufacturer with your serial number.

Do I need to change my MAC address permanently or is temporary enough?

For most purposes, a temporary change is sufficient. Permanent changes are useful only if you need the spoofed address to persist across restarts — for example, to maintain a specific identity on a network you access regularly. If you are testing or troubleshooting, temporary is simpler and safer because a restart will undo any mistakes.