How to Replace Your Modem and Router

Before you start

Replacing a modem and router is usually a manageable job. Allow time for the provider to activate a new modem, which may take a few minutes or require a phone call. You will be offline during the swap, so plan accordingly.

Decide first what you are replacing:

• Only the router: easiest. No provider contact is generally needed.
• Only the modem: the provider usually needs to know, because the modem’s identifier is registered to your account.
• Both: do the modem first, then the router.
• A combined gateway: you may replace it with another gateway or with a modem plus router.

Do I need to tell my internet provider about a new modem?

Usually yes, for cable and DSL. A new modem generally needs to be activated or registered with your account before it can connect. Many providers offer an online or app-based activation, and others use a phone number. A new router, by contrast, typically needs no notice, though a few services may require approved hardware. For fiber, the provider installs the ONT, so contact them rather than swapping it yourself. See the fiber router guide.

Choose compatible equipment

1. Check your provider’s compatibility list before buying a modem. Many providers publish approved models and minimum standards.
2. Match speed. The modem and router should handle your plan’s speed.
3. Pick the right router. Almost any standard router will work. See can you use any router.
4. Compare costs. Compare the cost of buying against the monthly rental fee, if you pay one, and consider the warranty.

Step 1: Disconnect the old equipment

1. Unplug the power cords from the old modem and router.
2. Disconnect the coax, phone, or other line from the modem. If the connector is tight, a gentle turn with pliers can help, but do not force it.
3. Disconnect the Ethernet cable between the modem and router.
4. Note which cables went where, or take a photo.

Step 2: Connect the new modem

1. Attach the coax or phone cable to the new modem. Finger-tight is usually enough for coax.
2. Plug the modem into power.
3. Wait for the modem lights to settle. Meaning varies by brand, so check the manual.
4. Activate with your provider if required.

Step 3: Connect the new router

1. Use an Ethernet cable from the modem to the router’s WAN or Internet port.
2. Plug in the router and wait a few minutes.
3. Connect to its default Wi-Fi network or use its setup app.
4. Set a network name and a strong password. If you reuse your old Wi-Fi name and password, your devices may reconnect on their own.

Do the modem and router have to be next to each other?

Not necessarily. They are linked by an Ethernet cable, so they only need to be as far apart as the cable allows, with the usual limit around 100 meters for standard Ethernet. Still, the modem has to be where your line enters the home (see moving your modem and router to another room), while the router often works best in a central, open location. If the router goes elsewhere, run the cable carefully and avoid pinching it.

Step 4: Test and finish

• Test on a wired device and over Wi-Fi.
• Restart the modem and then the router if something does not connect.
• Update the router’s firmware. See how to tell if your router needs an update.
• Reconnect smart home gadgets, printers, and other devices.

Return or reuse the old gear

If you rented the old equipment, return it as instructed and keep proof. If you owned it, you may be able to reuse an old router or recycle it. Reset it before it leaves your home.

Can you replace a router, and when should you?

Yes. Age alone is not a hard rule, since a router that is five or seven years old may still work. It becomes worth replacing if it no longer receives updates, struggles with your devices, or limits your plan’s speed.

Spectrum customers

If you are with Spectrum, see using your own router with Spectrum.