Understanding Your Hardware’s Network Fingerprint
Every single device capable of connecting to a network—whether it is a smartphone, a smart TV, or your MacBook—is assigned a unique, permanent identifier during the manufacturing process. This 12-character alphanumeric code is called a Media Access Control (MAC) address.
Unlike an IP address, which changes depending on which Wi-Fi network you connect to (like your house versus a coffee shop), your Mac’s MAC address is hardcoded into its physical networking chip. It never changes.
Most Mac users will never need to know their MAC address. However, if you are moving into a university dormitory, setting up a highly secure corporate network, or trying to configure a strict firewall on your home router, the network administrator will explicitly ask for your Mac’s MAC address to grant it permission to access the internet.
Finding this 12-character code in macOS takes only a few clicks, but you need to know exactly which networking menu to look in.
How to Find Your Wi-Fi MAC Address in macOS
Because modern MacBooks rely almost entirely on wireless internet, the Wi-Fi MAC address is the one you will need 99% of the time.
- Click the Apple Logo in the extreme top left corner of your screen.
- Select System Settings (or System Preferences on older versions of macOS).
- In the left-hand sidebar, click on Network.
- On the right side of the window, click on Wi-Fi.
- Scroll down to the bottom of the Wi-Fi menu and click the Advanced… button.
- A new window will appear showing your technical network details. Look near the very bottom for a line labelled Wi-Fi MAC Address.
- You will see a code formatted like this:
A1:B2:C3:D4:E5:F6. This is your MAC address.
Pro Tip: You can highlight this code with your mouse and press Cmd + C to copy it, ensuring you do not make a typo when sending it to your IT department.
How to Find Your Ethernet MAC Address
If you are using a desktop Mac (like an iMac, Mac Mini, or Mac Studio) or you connect your MacBook to a router using a physical Ethernet cable and an adapter, your computer will actually use a completely different MAC address for that wired connection.
If you give an IT administrator your Wi-Fi MAC address, but then plug in an Ethernet cable, the network will block you. You must provide the correct address for the method you are using to connect.
- Open System Settings > Network.
- Instead of clicking Wi-Fi, look for your wired connection (usually labelled Ethernet, USB LAN, or Thunderbolt Bridge). Click on it.
- Click the Advanced… or Details… button for that connection.
- Click on the Hardware tab at the top of the new window.
- The very first line will read MAC Address, followed by a different 12-character code. Provide this specific code to your network administrator.
Does Apple Use Private MAC Addresses on Mac?
To improve privacy on public networks, Apple’s iPhones and iPads use a feature called “Private Wi-Fi Address,” which constantly scrambles and fakes the MAC address to prevent coffee shops and shopping centres from tracking your physical movements.
However, as of macOS Sonoma, Apple does not use this scrambling feature on MacBooks or desktop Macs by default. The MAC address you see in the System Settings is your true, permanent hardware address, making it perfectly reliable for registering on secure university or corporate networks.
