What a Mac ID is and why you need it

Your Mac's unique identifier — usually called the MAC address or hardware address — is a 48-digit code that identifies your computer on a network. It looks like this: 00:1A:2B:3C:4D:5E. Every network device has one, and no two are identical.

You'll need this number when you're setting up a new WiFi network, troubleshooting connection problems with your internet provider, registering your device on a work or school network, or connecting to a printer or other networked device. Some networks also use MAC filtering, which means they only allow devices with approved MAC addresses to connect.

The process takes less than two minutes, and you don't need any special software or administrator permission.

Key Takeaways

  • Your Mac's MAC address is a unique 48-character code that identifies your computer on a network, and you can find it in System Settings without any special tools.
  • The fastest method is to open System Settings, click Network, select your active connection, and look for the "MAC Address" field in the details section.
  • If you're connected by WiFi, the MAC address shown is for your WiFi adapter; if you're using Ethernet, it's for your wired connection — they are different numbers.
  • You can also find your MAC address from the Terminal app by typing a single command, which is useful if you need to copy it quickly or verify it matches what System Settings shows.

Finding your MAC address in System Settings

Open System Settings (the gear icon in your dock or Applications folder). Click Network in the left sidebar. You'll see a list of connection types — WiFi, Ethernet, Bluetooth, and others.

Click the connection you're currently using. If you're on WiFi, click WiFi. If you're plugged in with an Ethernet cable, click Ethernet. A details panel opens on the right side. Scroll down until you see the field labeled MAC Address. The number displayed there is your unique identifier — it's usually a series of letters and numbers separated by colons, like A4:5E:60:D1:2B:3F.

Write this number down or take a screenshot. If you need the MAC address for a different connection type (for example, you normally use WiFi but want the Ethernet address), repeat the process by clicking that connection instead.

Finding your MAC address using Terminal

If you prefer the command line or need to verify the address quickly, you can use the Terminal app. Open Terminal (search for it in Spotlight or find it in Applications > Utilities). Type this command exactly:

ifconfig | grep -i "hwaddr\|lladdr"

Press Enter. Terminal displays a list of all your network adapters and their MAC addresses. Look for the line that corresponds to your active connection — en0 is usually WiFi, and en1 or en5 is usually Ethernet, though this varies by Mac model. The MAC address appears next to HWaddr or lladdr.

This method is faster if you're copying the address to paste elsewhere, because you can select and copy directly from the Terminal output.

Understanding which MAC address you're looking at

Your Mac has a separate MAC address for each way it connects to a network. If you use both WiFi and Ethernet, you have two different MAC addresses — one for each adapter. The number you see in System Settings depends on which connection you selected.

When a network or device asks for your MAC address, make sure you're giving them the address for the connection type you'll actually be using. If you're connecting to WiFi, provide the WiFi MAC address. If you're plugging in an Ethernet cable, provide the Ethernet address. Giving the wrong one will cause connection problems.

Bluetooth devices also have their own MAC addresses, which you can find the same way — by clicking Bluetooth in System Settings and looking at the details for your device.

What to do if you can't find the MAC address field

If you open System Settings and don't see a MAC Address field, check that you've selected an active connection — one that shows a green dot or "Connected" status. Inactive connections sometimes don't display the MAC address until you click on them.

If you're still not seeing it, try scrolling down in the details panel. On some Mac models, the MAC address field is below other information like IP address and subnet mask. If scrolling doesn't help, try the Terminal method instead — it works on all Macs and always shows the address.

Sharing your MAC address safely

Your MAC address is not sensitive information in the way a password is. It's designed to be shared with networks, devices, and technical support. However, only give it to the specific network or organization that asks for it — don't post it publicly online or share it with people you don't trust.

If you're working with technical support and they ask for your MAC address, you can safely provide it over email, phone, or chat. They need it to troubleshoot connection problems or register your device on their network.

Frequently Asked Questions

Can I change my Mac's MAC address?

Yes, but it's rarely necessary. You can spoof a MAC address using Terminal commands, but the change is temporary and resets when you restart your Mac. Most people never need to do this. If a network is blocking your device, contact the network administrator instead of trying to change your address.

Is my MAC address the same as my IP address?

No. Your MAC address is a hardware identifier that stays the same on your local network. Your IP address is assigned by your router or network and can change. You can find your IP address in the same System Settings panel where you found your MAC address — it's listed as "IPv4 Address" or similar.

Why does my Mac show different MAC addresses in different places?

If you see different addresses in System Settings versus Terminal, you're probably looking at different connection types. WiFi and Ethernet have separate MAC addresses. Make sure you're checking the same connection in both places — if System Settings shows your WiFi address, run the Terminal command and look for the line labeled en0 or whichever interface corresponds to WiFi on your model.

Do I need my MAC address to connect to public WiFi?

Most public WiFi networks don't require your MAC address. You usually just select the network name and enter a password. MAC addresses are more commonly needed for work networks, school networks, or home networks where the administrator has set up MAC filtering for security.