What a Mac ID address is and why you need it

Your Mac's ID address — also called a MAC address or physical address — is a unique identifier built into your network hardware. It looks like a string of letters and numbers separated by colons, such as a1:b2:c3:d4:e5:f6. Your Mac has one for Wi-Fi and another for Ethernet if you use a wired connection.

You need this address when you set up a new Wi-Fi network, register a device with your internet provider, or troubleshoot connection problems. Some networks also use MAC addresses to control which devices can connect — your IT department or network administrator might ask for it before letting your Mac onto a work or school network.

The address is different from your IP address, which changes when you reconnect to a network. Your MAC address stays the same and identifies your specific hardware.

Key Takeaways

  • Your Mac's ID address is a unique hardware identifier that looks like six pairs of letters and numbers separated by colons.
  • You can find it in System Settings under Network, or in System Information under the Wi-Fi or Ethernet section.
  • Your Mac has a separate ID address for Wi-Fi and for Ethernet, so check the connection type you actually use.
  • The address never changes unless you replace your network hardware, so you can write it down and keep it for future reference.

Finding your Wi-Fi ID address in System Settings

Open System Settings by clicking the Apple menu in the top left corner and selecting System Settings. On the left sidebar, click Wi-Fi. You should see your current network name listed. Click the information icon (a small circle with an i) next to your network name.

A details panel will open. Scroll down until you see MAC Address — this is your Wi-Fi ID address. The address will be displayed as six pairs of characters separated by colons. You can click on it to copy it to your clipboard, then paste it wherever you need it.

If you do not see the information icon next to your network name, make sure you are connected to Wi-Fi first. The icon only appears when a network is active.

Finding your Ethernet ID address in System Settings

If your Mac connects to the internet through a wired Ethernet cable instead of Wi-Fi, follow the same path: open System Settings, then click Ethernet on the left sidebar. You will see your wired connection listed. Click the information icon next to it.

The details panel will show your Ethernet MAC Address in the same format as Wi-Fi — six pairs of characters separated by colons. Copy it the same way by clicking on the address.

Your Ethernet address is different from your Wi-Fi address, even though both are on the same Mac. If you switch between wired and wireless connections, you may need both addresses depending on which network you are registering with.

Finding your ID address in System Information

An alternative method works on any Mac: click the Apple menu, select About This Mac, then click the System Report button. In the window that opens, click Network in the left sidebar.

You will see a list of network interfaces. Click Wi-Fi to see your wireless MAC address, or click Ethernet to see your wired address. Look for the line labeled MAC Address — the address appears to the right of it.

This method is useful if System Settings is not responding or if you need to view multiple network addresses at once. The address shown here is identical to what you would find in System Settings.

What to do if you cannot find the MAC address

If you do not see a MAC address in either location, your network hardware may not be active. Make sure your Wi-Fi is turned on by checking the Wi-Fi icon in the menu bar at the top right of your screen — it should show signal bars, not a crossed-out symbol. If Wi-Fi is off, click the icon and select a network to connect to.

For Ethernet, physically check that the cable is plugged into your Mac and into your router or network device. If the cable is connected but System Settings still shows no Ethernet option, the port or cable may be damaged.

If you have recently replaced your network card or Wi-Fi module, the new hardware will have a different MAC address than the old one. If a network administrator told you a specific address was registered, but your current address does not match, this is likely why.

Storing and using your MAC address

Once you have found your address, write it down or save it in a notes app — it will not change unless you replace your network hardware. Many people keep a list of their device addresses in case they need to register with a new network or troubleshoot connection problems later.

When you need to provide your MAC address to someone — an IT department, your internet provider, or a network setup tool — paste the full address exactly as it appears, including all the colons. Some systems accept addresses with hyphens instead of colons, but colons are the standard format on Mac.

If you are setting up a guest network or registering multiple devices, remember that each device has its own unique MAC address. A phone, tablet, or another computer will have completely different addresses than your Mac.

Frequently Asked Questions

Can I change my Mac's ID address?

The hardware address itself cannot be changed — it is burned into your network card when it is manufactured. Some advanced users can spoof or mask the address in software, but this is not a standard task and can cause network problems. For most purposes, you should use your real MAC address.

Why does my Mac have two different ID addresses?

Your Mac has one address for Wi-Fi and a separate one for Ethernet because they are two different pieces of hardware. When you connect through Wi-Fi, the wireless card identifies itself with one address. When you plug in an Ethernet cable, the wired port uses a different address. You only need the address for whichever connection type you actually use.

Is my MAC address the same as my IP address?

No — they are completely different. Your MAC address is a permanent hardware identifier that never changes. Your IP address is assigned by your network and changes each time you reconnect or move to a different network. Networks use MAC addresses to identify devices on the local network, and IP addresses to route traffic across the internet.

Do I need my MAC address to connect to Wi-Fi?

No, you do not need to know your MAC address to connect to Wi-Fi normally. You only need it if the network administrator has set up MAC filtering, which means only specific devices are allowed to connect. In that case, you would provide your address to the administrator so they can add your Mac to the allowed list.

What if I see multiple MAC addresses in System Information?

This is normal — System Information lists every network interface on your Mac, including Wi-Fi, Ethernet, Bluetooth, and sometimes virtual network adapters. Find the one that matches the connection type you use. If you are unsure which one is correct, click each one and look for the one that shows an active connection or a green status indicator.