Your Mac ID is a unique identifier built into your network hardware

Your Mac ID — technically called a MAC address (Media Access Control address) — is a 48-digit code that identifies your Mac's network card on any local network. It looks like this: 00:1A:2B:3C:4D:5E. Every device with internet capability has one, and it never changes unless you replace the network hardware itself.

You need this number when you're setting up a home network, connecting to a work WiFi system that requires device registration, or troubleshooting connection problems with your internet provider. It's different from your IP address, which can change; your MAC address is permanent to that specific machine.

Key Takeaways

  • Your Mac address is a unique hardware identifier that stays the same throughout your Mac's life, found in System Settings under Network.
  • WiFi and Ethernet connections have separate MAC addresses, so you may need to find both depending on which network you're using.
  • The Terminal app can show your MAC address in seconds if you prefer the command-line method over clicking through menus.
  • Your MAC address is not sensitive information — it's visible to anyone on your local network — but you should only share it with your internet provider or network administrator when they specifically ask.

Finding your MAC address through 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 depending on what hardware your Mac has.

Select the connection type you want to check — usually WiFi if you're on wireless, or Ethernet if you're plugged in with a cable. Click the Details button on the right side. A window opens showing connection information. Look for the line labeled MAC Address. That's your identifier. You can highlight it and press Command+C to copy it.

If you have both WiFi and Ethernet connected, repeat this process for each one. They will have different MAC addresses because they're different pieces of hardware inside your Mac.

Finding your MAC address using Terminal

Open Terminal (search for it in Spotlight by pressing Command+Space, type "terminal", and press Enter). Paste this command and press Enter:

ifconfig | grep ether

Terminal displays a list of network interfaces with their MAC addresses next to "ether". If you're on WiFi, look for the line starting with "en0" or "en1". If you're using Ethernet, look for "en5" or similar (the exact number varies by Mac model). The 12-digit code after "ether" is your MAC address.

This method is faster if you're comfortable with Terminal, and it shows all your network hardware at once.

MAC addresses for WiFi versus Ethernet

Your Mac has a separate MAC address for each type of network connection. The WiFi card has one address. If you plug in an Ethernet cable, that connection has a different address. Bluetooth connections also have their own address.

When your internet provider or network administrator asks for your MAC address, ask which connection they need — usually it's WiFi if you're at home, or Ethernet if you're at an office. If they don't specify, provide the one for the connection you actually use most often.

Why you might need your MAC address

Internet providers sometimes require MAC address registration before your connection works, especially if you're using a new router or modem. Some workplace and school networks register devices by MAC address so only approved hardware can connect. Home networks can be set up to allow or block specific devices using their MAC addresses as a security measure.

If you're troubleshooting a connection problem, your internet provider's support team may ask for your MAC address to look up your account and see what device is connected on their end.

What to do with your MAC address once you have it

Write it down or take a screenshot if someone has asked you for it. You can also email it to yourself or paste it into a note. Keep it handy until you've completed whatever setup or troubleshooting you needed it for.

Your MAC address is not secret information — anyone on your local network can see it. You don't need to protect it like a password. However, only share it with people who specifically ask for it as part of a legitimate setup or support process.

Frequently Asked Questions

Can I change my MAC address?

Yes, but it's not permanent. You can spoof a MAC address in Terminal for testing purposes, but it resets when you restart your Mac. The actual hardware address cannot be changed without replacing the network card. Most people never need to change it.

Is my MAC address the same as my IP address?

No. Your MAC address identifies your device on a local network and never changes. Your IP address is assigned by your internet provider or router and can change. Your MAC address works on your home or office network; your IP address works across the internet.

Why does my MAC address show up differently in different places?

You may see it written as 00:1A:2B:3C:4D:5E (with colons) or 001A2B3C4D5E (without). These are the same address in different formats. Some systems use colons, others use hyphens or nothing at all. The actual identifier is identical.

What if I can't find the MAC address in System Settings?

Make sure you've selected a connection type (WiFi or Ethernet) and clicked Details. If Details is grayed out, that connection isn't currently active. Try the Terminal method instead — it shows all addresses at once regardless of whether they're in use.

Do I need a different MAC address for each WiFi network I join?

No. Your Mac's WiFi MAC address stays the same no matter which network you connect to. The address identifies your hardware, not the network. You only have one WiFi MAC address per Mac.