Unpack, connect, and power on your modem

Setting up an Xfinity modem takes about 10 minutes and requires three physical connections: power, the coaxial cable from your wall outlet, and an ethernet cable to your router (or directly to a device if you're using the modem's built-in WiFi). Remove the modem from the box, find a spot near your coaxial wall outlet and power outlet, and make those three connections in any order. Then plug in the power cable.

The modem will take 2 to 5 minutes to boot up. You'll see lights on the front panel turn on in sequence—first the power light, then the downstream and upstream lights as it connects to Xfinity's network. When the online light turns solid green or blue (depending on your modem model), the hardware setup is complete.

Key Takeaways

  • Connect the coaxial cable from your wall outlet, the power cable, and an ethernet cable to your router, then power on the modem.
  • Wait for the online light to turn solid green or blue, which means the modem has connected to Xfinity's network.
  • Most Xfinity modems set up automatically when you power them on if your account is already set up with Xfinity.
  • If the online light stays red or doesn't light up after 10 minutes, restart the modem by unplugging it for 30 seconds.
  • You can manage your modem settings and WiFi password through the Xfinity My Account app or by visiting 10.0.0.1 in a web browser.

What the lights on your modem mean

The front panel of your Xfinity modem displays several lights that tell you what's happening. The power light should be solid green or blue when the modem is on. The downstream and upstream lights indicate the modem is communicating with Xfinity's network—they may blink during startup and should settle into a steady state once connected.

The online light is the most important one: when it's solid green or blue, your modem is fully connected and ready to use. A blinking online light means the modem is still connecting. A red online light or no light at all means there's a problem—usually a loose cable or a service outage in your area. If you see a red light, check that the coaxial cable is hand-tight at both ends (the wall outlet and the modem), wait another minute, and restart the modem if it doesn't turn green.

Restart your modem if it's not connecting

If the online light stays red or doesn't appear after 10 minutes, a restart often fixes the problem. Unplug the power cable from the back of the modem, wait 30 seconds (this clears the modem's memory), and plug it back in. The modem will go through its startup sequence again—this takes 2 to 5 minutes.

If the online light still doesn't turn green after a restart, check the coaxial cable connection at both ends. The cable should screw on hand-tight—you shouldn't need a wrench. If the cable is loose, tighten it, wait a minute, and see if the online light changes. If the light is still red and the cable is tight, the problem is likely on Xfinity's end or with your account setup, and you'll need to contact Xfinity support.

Access your modem settings through a web browser

Once the online light is solid green or blue, you can log into your modem's settings page to check the connection status, restart the modem remotely, or change your WiFi password. Open a web browser on any device connected to your modem and go to 10.0.0.1. You'll see a login page.

The default username is admin and the default password is motorola (or sometimes motorola123, depending on your modem model). If those don't work, check the sticker on the back or bottom of the modem—it lists the correct credentials. Once you're logged in, you can see your downstream and upstream signal levels, restart the modem, and access WiFi settings.

Change your WiFi password and network name

Your Xfinity modem broadcasts a WiFi network with a default name and password printed on a sticker on the device. You can change both through the settings page at 10.0.0.1, or more easily through the Xfinity My Account app on your phone.

To change your WiFi password in the app, open it, tap the menu icon, select "Internet," then "WiFi," and choose "Edit WiFi Name and Password." You can create a custom network name and a password you'll remember. The change takes effect when ready, and all devices will need to reconnect using the new password. If you forget the new password later, you can always reset it the same way.

When to call Xfinity support

If the online light stays red after you've restarted the modem and checked the coaxial cable connection, or if you can connect to the modem's settings page but the internet still doesn't work, contact Xfinity support. You can reach them at 1-800-934-6489 or through the My Account app. Have your account number and the modem's serial number (on the sticker) ready when you call.

You should also contact support if you're seeing frequent disconnections, very slow speeds, or if the modem won't power on at all. These are usually signs of a network issue on Xfinity's side, a problem with your account, or a modem that needs to be replaced under warranty.

Frequently Asked Questions

Do I need to call Xfinity to set up my modem?

No. Most Xfinity modems set up automatically when you power them on if your account is already set up with Xfinity. The modem connects to the network and registers itself. If you're a new customer or switching modems, Xfinity may need to provision the modem on their end, but they usually do this automatically within a few minutes of the modem connecting.

What if the online light never turns green?

Check that the coaxial cable is hand-tight at both the wall outlet and the modem. Restart the modem by unplugging it for 30 seconds. If the light is still red after that, there may be a service outage in your area—check the Xfinity website or app for outage reports. If there's no outage and the light stays red, contact Xfinity support; the modem may need to be replaced or your account may need to be provisioned.

Can I use my own modem instead of the Xfinity one?

Yes, but you'll need a modem that's on Xfinity's approved list. Xfinity publishes a list of compatible modems on their website. If you use your own modem, you won't rent one from Xfinity, which saves you a monthly fee. The setup process is the same: connect the coaxial cable, power, and ethernet, then wait for the online light to turn green.

Why is my WiFi password different from the one on the modem sticker?

Xfinity sometimes changes the default WiFi password after you set up your account. Check the Xfinity My Account app under "Internet" and "WiFi" to see your current password. If you've changed it yourself and forgotten it, you can reset it to a new one through the app or the modem settings page at 10.0.0.1.

Is it safe to restart my modem frequently?

Yes. Restarting your modem is safe and often fixes connection problems. You can restart it as often as you need to. Each restart takes 2 to 5 minutes, during which your internet will be down. If you're restarting more than once a week, contact Xfinity support—frequent disconnections usually mean there's a deeper problem with your connection or account.