Is another device using your computer's IP address? Here's the fix!

Rene with gold 12-inch MacBook
Rene with gold 12-inch MacBook (Image credit: iMore)

Are you getting this message when you try to use the internet on your Mac: "Another device on the network is using your computers IP Address.If you continue to have problems, change the IP Address of this computer or the IP address of the other device"?

If so, you may need to assign a new lease or reset the location of your Wi-Fi. Here's how.

How to check the Wi-Fi settings on your Mac

The first thing you should check is whether your Wi-Fi settings are correct.

  1. Click on the Apple icon () in the upper left corner of your screen.
  2. Select System Preferences... from the dropdown menu.

  1. Click on Network.
  2. Check that Location is set to automatic. If it is not:a. Click the dropdown menu next to Location.b. Select Automatic.

  1. Click the Advanced... button at the bottom right of the Network window.
  2. Click on TCP/IP.

  1. Make sure Configure IPv4 shows Using DHCP. If it does not:a. Click the dropdown menu next to Configure IPv4.b. Select Using DHCP.

  1. Make sure the first Router line shows an address. If it is blank, restart your router.

Check for router on Mac

  1. Make sure Configure IPv6 shows Automatically. If it does not:a. Click the dropdown menu next to Configure IPv6.b. Select Automatic.
  2. Click OK to save the changes.

How to get a new IP address on your Mac

Once you've made sure your settings are correct, you can get a new IP address to force the router to forget the IP address your Mac is currently using.

  1. Click on the Apple icon () in the upper left corner of your screen.
  2. Select System Preferences... from the dropdown menu.

  1. Click on Network.
  2. Click on Advanced.

  1. Click on TCP/IP
  2. Click the Renew DHCP Lease button.
  3. Click OK to save the changes.

This will give your computer a new address instead of trying to use one that is already assigned to a different device.

What if a new IP address doesn't work?

If you still see the same message that another device on the network is using your computers IP address, you can turn your Wi-Fi off and on again to reset the system.

  1. Click on the Apple icon () in the upper left corner of your screen.
  2. Select System Preferences... from the dropdown menu.

  1. Click on Network.
  2. Click on the Turn Wi-Fi Off button.

  1. Click on the Turn Wi-Fi On button.

Turning on Wi-Fi on Mac

Any questions?

There are a couple of different reasons why your computer might be sharing an IP address with another device. If the steps above don't work, post your issue here and we'll try to help.

Lory Gil

Lory is a renaissance woman, writing news, reviews, and how-to guides for iMore. She also fancies herself a bit of a rock star in her town and spends too much time reading comic books.  If she's not typing away at her keyboard, you can probably find her at Disneyland or watching Star Wars (or both).

6 Comments
  • 1) If it is *your* IP address, I thought the gist of this article would be about how to keep it as yours, not get a new one (ie, reserved IP addresses on routers).
    2) I am pretty sure that if *your* IP is in use, the Mac will notify you of that and automatically pick another one, at least under DHCP.
  • Yeah this article doesn't really make sense to me, unless you aren't using DHCP
  • I would love to know how to get my Mac at home to stop connecting to "xfinitywifi". I tried it in the past (my mom is a customer) and have since told my Mac, iPhone and iPad to all forget that network. And yet... when I restart my home router my home Mac tries to connect to that in its place. It is VERY aggravating especially since I connect to my home Mac remotely and can't reconnect it to my home WiFi remotely. Any help here would be MUCH appreciated!
  • If your mac connects to any network automatically to which you'd like it not to connect, you can go to the System Preferences > Network, and then select the wifi entry on the left... then advanced, and under the "Wi-Fi" tab, look for the name you want to remove in the "Preferred Networks" list, click on it to select it, and click on the "-" sign near the lower left of that window. That'll remove it from the list of networks, and your mac won't automatically try to connect to it when at network named similarly is visible.
  • I have tried that several times and somehow xfinitywifi returns to that list every time.
  • I get the same error message each time I log on to my MBP, but it appears to have no impact as I can use the internet w/ no problems. So, I just want to get rid of the pesky message! Can you help me?