Modem and Equipment Support

Learn about your CenturyLink modem

Top modems


Find the model number on your modem sticker

Check the sticker on the back or bottom of the modem to find your model name and number.

Sticker label on tower modem
C4000 modem label

Fiber modems

Older modems - TIME TO REPLACE!

The following models are retired or being retired soon, and should be replaced as soon as possible. Visit the retired modems page to get specifications and firmware for each of the modems listed below.





















Install your modem and connect your internet

Setting up a new modem or new internet service from CenturyLink? Choose the type of modem you have to view a setup video and written instructions.

For the following models:
C4000BG  *  C4000BZ  *  C4000LG  *  C4000LZ  *  C4000XG

For the following models:
C3000Z  *  C3510XZ  *  C844G  *  C424G  *  C2300A  *  PK5000Z

For following models:
C5500XK SmartNID

Connect devices to your WiFi network

Top modem troubleshooting tips

Slow or spotty internet connection? The best place to start is rebooting your modem/router.

Is your firmware up to date? Modems usually update themselves, but you can check the settings to see if there's an upgrade available.

Tried the above and still having trouble? In more severe cases, a technician or support agent may instruct you to do a modem reset.

The best solution is prevention. Learn how to care for your router.

How to read and troubleshoot the modem lights

Depending on the model of CenturyLink modem/router that you have, the lights will function a bit differently. Choose the correct guide to help you understand what the status lights tell you and how to use them to troubleshoot your internet connection.

For the following models:
C4000BG  *  C4000BZ  *  C4000LG  *  C4000LZ  *  C4000XG

For all following models:
Actiontec   *   Adtran   *   Calix   *   Technicolor   *   Zyxel (except C4000)

Guide to the modem lights (C4000 series)

Guide to the modem lights (tower-style modems)

Security types and WiFi standards of top CenturyLink modems

Modem Model
Security Type
WiFi Standard
C4000 WPA3 WiFi 6
C3510XZ WPA2-PSK WiFi 6
C3000Z WPA2-PSK WiFi 6
C2300A WPA2-AES WiFi 5
PK5000Z WPA2 WiFi 5
C2100 WPA2-AES WiFi 5
C424G WPA2-AES WiFi 5
C844G WPA2-AES WiFi 5

Modem settings

You can customize your WiFi, security, and more from the modem settings GUI.

Advanced modem settings

Please proceed with caution!

When you see this caution icon, it means the advanced setting you're looking at should only be configured with the help of a professional.

Modem support videos

Use the modem utilities to reboot, reset, and update firmware

How (and why) to reboot your modem regularly

How to control your modem settings

How to manage your modem's wireless settings

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