What a Mac address is and why you'd change it
Your Mac address (media access control address) is a unique identifier assigned to your network card — the hardware that connects your device to your router. It looks like six pairs of numbers and letters: 00:1A:2B:3C:4D:5E. Unlike your IP address, which your internet service provider assigns and can change, your Mac address is baked into your device's physical network hardware.
Changing your Mac address is called spoofing. You might do this to prevent your device from being tracked on public networks, to test how your router handles new devices, or to work around a network restriction that's tied to a specific Mac address. It's a legitimate technical skill, though some networks (like corporate ones) monitor for spoofed addresses as a security measure.
The change is temporary — it resets when you restart your device — so there's no permanent alteration to your hardware. You're just telling your operating system to broadcast a different identifier to the network.
Key Takeaways
- Your Mac address is a hardware identifier that your device broadcasts to networks; changing it is temporary and resets on restart.
- On Windows, you 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 or manually revert it.
- On Linux, you can use the ifconfig or ip command to change your Mac address, depending on your distribution.
- Some networks block or flag spoofed addresses, so test carefully on networks you own before trying this on public or shared networks.
How to change your Mac address on Windows
On Windows, the easiest route is through Device Manager. Open Device Manager (right-click the Start button and select it, or search for it directly), then expand Network adapters. Right-click the network adapter you want to change — usually something like "Ethernet" or "Wi-Fi" — and select Properties.
Click the Advanced tab. Look for a property called Locally Administered Address, Network Address, or MAC Address (the exact name varies by adapter). Click it, then select the Value field on the right and enter your new Mac address — 12 characters (numbers and letters A–F only, no colons or hyphens). Click OK. Your network will briefly disconnect and reconnect with the new address.
If you don't see that property, your network adapter doesn't support Mac address changes through Device Manager. In that case, you'll need third-party software like TMAC or Technitium MAC Address Changer, both of which have free versions. read, install, select your adapter, enter the new address, and click Change. The change takes effect when ready.
How to change your Mac address on macOS
On macOS, you'll use Terminal. Open Terminal (search for it in Spotlight or find it in Applications > Utilities). First, find your network interface name by typing ifconfig and pressing Enter. Look for the interface you want to change — usually en0 for Ethernet or en1 for Wi-Fi — and note its current Mac address (listed as ether).
Before you change it, you need to bring the interface down. Type sudo ifconfig en0 down (replace en0 with your interface name) and press Enter. You'll be asked for your password. Then type sudo ifconfig en0 lladdr 00:1A:2B:3C:4D:5E (replace the address with your new one) and press Enter. Finally, bring the interface back up: sudo ifconfig en0 up.
To verify the change worked, type ifconfig again and check that the ether address for your interface has changed. The new address will persist until you restart your Mac or manually change it back. To revert, repeat the steps with your original Mac address.
How to change your Mac address on Linux
On Linux, the process depends on whether your system uses ifconfig (older distributions) or ip (newer ones). Open a terminal and type ifconfig to see if it's installed. If it shows your network interfaces, use that method. If not, use the ip method instead.
Using ifconfig: Type sudo ifconfig eth0 down (replace eth0 with your interface name) to bring the interface down. Then type sudo ifconfig eth0 hw ether 00:1A:2B:3C:4D:5E (with your new address) and press Enter. Bring it back up with sudo ifconfig eth0 up. Verify with ifconfig.
Using ip: Type sudo ip link set dev eth0 down to bring the interface down, then sudo ip link set dev eth0 address 00:1A:2B:3C:4D:5E with your new address. Bring it up with sudo ip link set dev eth0 up. Check the change with ip link show eth0. On restart, the original address returns.
When a Mac address change won't work or isn't allowed
Some networks actively block or flag spoofed Mac addresses. Enterprise networks, university networks, and some public Wi-Fi systems use MAC filtering — they maintain a list of allowed addresses and reject anything else. If you change your address on these networks, you'll lose connection or be blocked entirely.
Additionally, some network adapters (particularly older ones or those with locked drivers) don't support Mac address changes at all. If Device Manager doesn't show the property, or if Terminal commands return an error, your hardware may not allow it. Check your adapter's documentation or the manufacturer's website to confirm whether spoofing is supported.
If you're testing on a network you own, try the change on a non-critical device first. If you're on a shared or public network, ask the network administrator before attempting this — some organizations have policies against it, and violating them could result in network access being revoked.
Why you might want to change your Mac address
The most common reason is privacy on public networks. Your Mac address is broadcast to every device on the same network segment, and it can be used to track you across different networks if you visit the same coffee shop or library regularly. Spoofing your address makes that tracking harder, though it's not a complete privacy solution — your IP address and browsing behavior still identify you.
You might also change your Mac address to test how your router or network management software handles new devices, or to work around a network restriction that's tied to a specific address (for example, if you've been temporarily blocked and need to reconnect). In some cases, people use it to bypass bandwidth limits that are enforced per-device, though doing this on a network you don't own is generally not advisable.
Frequently Asked Questions
Will changing my Mac address get me in trouble?
Not on networks you own or have permission to test. On shared or public networks, spoofing is usually allowed, but some organizations monitor for it and may ask you to stop. On corporate or institutional networks, it may violate acceptable use policies. Always check with the network administrator if you're unsure.
Does changing my Mac address hide me from my internet service provider?
No. Your ISP sees your traffic based on your IP address and the modem's Mac address, not your device's Mac address. Spoofing your device's Mac address only affects what other devices on your local network can see about you.
How do I know what Mac address to use?
You can use any valid Mac address format — 12 hexadecimal characters (0–9 and A–F). Many people generate a random one, or use an online Mac address generator. Just make sure it doesn't conflict with another device on the same network. If you're unsure, a random address is usually safe.
Will the change survive a restart?
No. On all three operating systems, the spoofed address resets to the original when you restart your device. If you want the change to persist, you'll need to set it again after each restart, or use system-level tools that automate the process on startup.
Can I change my Mac address on a phone or tablet?
Most phones and tablets don't allow Mac address changes without rooting (Android) or jailbreaking (iOS), and doing so voids your warranty and creates security risks. Some newer Android devices have a "randomize Mac address" option in Wi-Fi settings, which automatically generates a new address for each network you connect to — this is a safer, built-in alternative.