The basic steps to plug your Mac into an ethernet cable

Most Macs do not have an ethernet port built in anymore, so you will need a USB-C to ethernet adapter or a Thunderbolt to ethernet adapter depending on which ports your Mac has. Once you have the adapter, plug the ethernet cable into one end and plug the adapter into your Mac's USB-C or Thunderbolt port. Your Mac should recognize the connection automatically and start using it within a few seconds.

If your Mac is older and still has an ethernet port (usually a rectangular port slightly wider than a USB port), you can plug the cable directly in without an adapter. Either way, you will see a small ethernet icon appear in the menu bar at the top of your screen once the connection is active.

Your Mac will prefer the ethernet connection over Wi-Fi automatically once it detects a working cable. You do not need to do anything else — the system handles the switch on its own.

Key Takeaways

  • Most modern Macs require a USB-C or Thunderbolt to ethernet adapter because they do not have a built-in ethernet port.
  • Plug the ethernet cable into the adapter, then plug the adapter into your Mac's port, and the connection should work when ready.
  • Your Mac will automatically prefer ethernet over Wi-Fi once it detects a cable, so you do not need to manually switch networks.
  • If your connection does not appear, restart your Mac or try a different ethernet cable to rule out a hardware problem.

Which adapter you actually need

The type of adapter depends on your Mac model and how old it is. If your Mac has USB-C ports (most models from 2016 onward), you need a USB-C to ethernet adapter. If your Mac has Thunderbolt 3 or Thunderbolt 4 ports, you can use either a USB-C adapter or a Thunderbolt adapter — both will work, though Thunderbolt adapters are usually more expensive and not necessary for ethernet.

You can find the port type by looking at the physical ports on the sides of your Mac, or by clicking the Apple menu in the top left, selecting "About This Mac," and looking at the "Ports" section. Common adapters include the Apple USB-C to Gigabit Ethernet Adapter (the official Apple version) or third-party versions from Anker, Belkin, or other manufacturers. Third-party adapters are usually cheaper and work just as well.

If you have an older Mac with an actual ethernet port built in, you do not need an adapter at all — just plug the cable in directly.

What to do if the connection does not show up

If you plug in the adapter and ethernet cable but do not see the connection appear, first check that the cable itself is plugged in firmly on both ends. Ethernet cables can look connected when they are actually slightly loose. Unplug and replug both the cable and the adapter.

If that does not work, restart your Mac. Some adapters need a restart to be recognized, especially if you are using them for the first time. Shut down your Mac completely, wait a few seconds, and turn it back on.

If you still do not see a connection, try a different ethernet cable if you have one available. The cable itself might be damaged. If a different cable works, the original cable is the problem. If no cable works, the adapter itself may be faulty and you may need to replace it.

How to check your ethernet connection speed

Once your Mac is connected, you can see how fast the connection is running. Click the Wi-Fi icon in the menu bar at the top of your screen while holding the Option key on your keyboard. A menu will appear showing "Wi-Fi" and "Ethernet" sections. Under Ethernet, you will see the connection speed listed — usually "1 Gbps" (gigabits per second) for standard ethernet.

If the speed shows as much lower than expected, the cable or adapter may be damaged, or the port you are plugged into on the wall or router may not support full speed. Most home and office ethernet connections run at 1 Gbps, which is fast enough for streaming, video calls, and downloading large files.

When to use ethernet instead of Wi-Fi

Ethernet is faster and more stable than Wi-Fi because the cable creates a direct connection to your router or network. Use ethernet when you are doing something that needs a strong, steady connection: uploading large video files, downloading software updates, or doing video calls where your connection keeps dropping.

Ethernet also has lower latency, which means less delay between when you send information and when it arrives. This matters if you play online games or use real-time applications. If your Wi-Fi is slow or unreliable in the room where your Mac sits, plugging in ethernet is usually the fastest fix.

You do not need ethernet for everyday browsing, email, or streaming video — Wi-Fi works fine for those. But if you notice your connection is slow or unstable, ethernet is worth trying before you call your internet provider.

Switching back to Wi-Fi

If you want to disconnect the ethernet cable and go back to Wi-Fi, straightforward unplug the cable from the adapter or from your Mac. Your Mac will automatically switch back to Wi-Fi within a few seconds. You do not need to change any settings or restart anything.

If you want to keep the adapter plugged in but not use ethernet, you can turn off ethernet in System Settings. Click the Apple menu, select "System Settings," then click "Network" in the sidebar. Find "Ethernet" in the list and click it, then click "Details" and select "Off" from the Configure dropdown. This tells your Mac to ignore the ethernet connection even if a cable is plugged in.

Frequently Asked Questions

Do I need a special adapter or will any USB-C to ethernet adapter work?

Any USB-C to ethernet adapter will work with your Mac as long as it is designed for USB-C. Third-party adapters from Anker, Belkin, and other brands work just as well as the official Apple adapter and are usually cheaper. The only difference is build quality and warranty, not compatibility.

Can I use ethernet and Wi-Fi at the same time?

Yes, but your Mac will only use one at a time. It will prefer ethernet if both are connected and working. If you want to use Wi-Fi instead, unplug the ethernet cable or turn off ethernet in System Settings. You cannot split traffic between them automatically.

Why is my ethernet connection slower than my Wi-Fi?

This usually means the ethernet cable or adapter is damaged, or the port on the router or wall is not working properly. Try a different cable first. If a new cable works at full speed, the old cable was the problem. If the new cable is also slow, the adapter or the port may be faulty.

Will using ethernet drain my Mac's battery faster?

No. Ethernet actually uses slightly less power than Wi-Fi because the connection is more direct and stable. Your Mac's battery will last about the same or slightly longer on ethernet compared to Wi-Fi, though the difference is small.