Using your C4000 modem

Learn about using your C4000 series modem/router, including features and speed specifications, popular modem settings, and troubleshooting. You can also watch a video about controling WiFi on your C4000.

Recommended CenturyLink modem

C4000 modem front and back

C4000 features

  • WiFi 6 technology with dual-band 2.4 GHz and 5 GHz 802.11ax
  • Smart Connect single wireless network (SSID): Auto-selects the fastest band for each device
  • Single LED status light 
  • Dynamic QoS: Prioritizes data through the router for smoother streaming
  • Standards-based WiFi WPA3 security

Speed specifications

This router comes in multiple versions with different specifications. The one you have depends on your internet connection type. Click to open the specific models below for speeds and downloadable info sheets.

Diagram of the C4000XG modem

Diagram of the C4000XG modem

Top modem settings and tasks

Learn how to manage your internet and WiFi network using your modem. Below are some of our most popular topics. You can also visit the modem settings guide for a complete overview of settings and options.

Modem troubleshooting tips

Video: How to control your C4000 wireless settings

Need more WiFi? If you need to boost or extend your signal, consider ordering a WiFi extender from our Accessories shop, in the WiFi Performance area.

Starting new service? Please note that a phone jack is required to set up CenturyLink internet service in your home. If you don't have a jack, chat with us to have one installed.

Top Tools

Was this information helpful?