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 that connects your computer to the internet. It looks like six pairs of numbers and letters, such as 00:1A:2B:3C:4D:5E. Every device on a network uses its MAC address to find and talk to other devices on the same local network.
You might want to change your MAC address to test network equipment, work around a device limit on a shared network, or troubleshoot connection problems. Changing it is temporary unless you make the change permanent in your network settings — when you restart your computer, it usually reverts to the original unless you've configured it otherwise.
The process differs depending on whether you use Windows, macOS, or Linux, and whether you want the change to last only until your next restart or to stay in place permanently.
Key Takeaways
- Your MAC address is a hardware identifier that your network card uses to communicate on local networks, and you can change it through software without opening your computer.
- On Windows, you change your MAC address through Device Manager by editing the network adapter's advanced properties, and the change lasts until you restart.
- On macOS, you use Terminal commands to spoof your MAC address, and the change reverts when you restart unless you automate it with a script.
- On Linux, you can change your MAC address using the ip command or by editing network configuration files, depending on your distribution and whether you want the change to persist.
- Changing your MAC address does not affect your IP address or your internet connection — it only changes how your device identifies itself on the local network.
How to change your MAC address on Windows
On Windows, the easiest way to change your MAC address is through Device Manager. Right-click the Start menu and select Device Manager. Expand the Network adapters section, then right-click the network adapter you want to modify (usually called Ethernet or Wi-Fi) and select Properties.
Click the Advanced tab. In the list on the left, look for an option called Locally Administered Address, Network Address, or MAC Address — the exact name varies by network card manufacturer. Click it, then in the Value field on the right, enter your new MAC address without colons or hyphens (for example, 001A2B3C4D5E). Click OK and restart your computer.
The change takes effect after restart. When you restart again, Windows reverts to your original MAC address unless you repeat the process. If you do not see a Network Address option in the Advanced tab, your network card driver may not support MAC address changes, or you may need to update your driver from the manufacturer's website.
How to change your MAC address on macOS
On macOS, you change your MAC address using Terminal, which is a command-line tool. Open Applications > Utilities > Terminal. First, find the name of your network interface by typing this command and pressing Enter:
ifconfig
Look for en0 (usually your primary connection) or en1 (often Wi-Fi). To change the MAC address, type this command, replacing en0 with your interface name and 00:1A:2B:3C:4D:5E with your new MAC address:
sudo ifconfig en0 lladdr 00:1A:2B:3C:4D:5E
Press Enter and type your password when prompted. The change takes effect when ready. When you restart your Mac, the MAC address reverts to the original. To make the change permanent, you can create a script that runs at startup, but this requires editing system files and is beyond what most users need to do.
How to change your MAC address on Linux
On Linux, the method depends on your distribution and whether you want the change to last only until restart or to persist. The simplest temporary change uses the ip command. Open a terminal and type:
sudo ip link set dev eth0 address 00:1A:2B:3C:4D:5E
Replace eth0 with your network interface name (find it by typing ip link show) and 00:1A:2B:3C:4D:5E with your new address. Press Enter and type your password. The change takes effect when ready and lasts until restart.
To make the change permanent, you need to edit your network configuration file. On distributions using systemd-networkd (like Ubuntu 18.04 and later), edit the file /etc/systemd/network/99-custom.link (create it if it does not exist) and add these lines:
[Match] Name=eth0 [Link] MACAddress=00:1A:2B:3C:4D:5E
Save the file, restart your network service with sudo systemctl restart systemd-networkd, and the change persists across restarts. If your system uses a different network manager (such as NetworkManager or ifupdown), the configuration file location and format differ — check your distribution's documentation.
What happens to your IP address when you change your MAC address
Changing your MAC address does not automatically change your IP address. Your IP address is assigned by your router's DHCP server based on the MAC address, so if you change your MAC address and reconnect to the network, your router may assign you a different IP address. However, if you are already connected and only change the MAC address in software, your IP address stays the same until you disconnect and reconnect.
If you want to force your router to assign a new IP address after changing your MAC address, disconnect from the network (unplug the ethernet cable or turn off Wi-Fi), wait a few seconds, then reconnect. Your router will see the new MAC address and may issue a fresh IP address from its pool.
When to call a network professional
Changing your MAC address is a safe operation that does not damage your hardware or software. However, if you are changing your MAC address to work around a network restriction (such as a device limit imposed by your internet service provider or network administrator), be aware that this may violate your service agreement or workplace policy. Check with your network administrator or ISP before making the change.
If you change your MAC address and lose internet connectivity, restart your computer to revert to your original MAC address, then check your network settings or contact your ISP. If you are not comfortable using Terminal or Device Manager, a local computer repair shop can help, though the cost may not be worth it for a straightforward MAC address change.
Frequently Asked Questions
Will changing my MAC address affect my internet speed?
No. Your MAC address only identifies your device on the local network between your computer and your router. It does not affect how fast data travels to and from the internet. If you notice slower speeds after changing your MAC address, the cause is something else — restart your computer and check your connection.
Can I change my MAC address back to the original?
Yes. On Windows, go back to Device Manager, clear the Network Address field, and restart. On macOS and Linux, restart your computer and the original MAC address returns automatically (unless you set up a permanent change script). If you saved your original MAC address before changing it, you can also manually enter it using the same steps.
Do I need to change my MAC address to fix connection problems?
Rarely. MAC address changes are useful for testing network equipment or working around device limits, not for fixing slow or dropped connections. If your internet is unstable, restart your router and computer first, check for driver updates, and contact your ISP if the problem continues.
Will my router recognize me as a different device if I change my MAC address?
Yes. Your router uses the MAC address to identify devices, so a new MAC address looks like a new device. If your router has a device limit or a whitelist of allowed MAC addresses, changing yours may cause you to lose access until you reconnect or the router reassigns addresses.
Can I change my MAC address on a smartphone?
Most smartphones do not allow you to change your MAC address through the settings menu. Some Android phones with developer options enabled can spoof a MAC address, but the process varies by manufacturer and is not supported by most carriers or networks. iPhones do not provide a way to change your MAC address.