Using your C1100T modem

Learn about using your C1100T modem/router, including features and specs, popular modem settings, and troubleshooting.

Older CenturyLink modem

This modem is being retired — time to get a replacement!

C1100T modem front and back

Features & specifications

WiFi:  2.4 GHz 802.11 b/g/n

Other features: Secure WiFi compatible (with leased modem)

The C1100T gateway modem is tested and certified to run at these speeds* on the CenturyLink® High-Speed Internet network:

ADSL connection - up to 7 Mbps
ADSL2 connection - up to 20 Mbps 
VDSL2 connection - up to 100 Mbps
Fiber connection - up to 940 Mbps

*Customer speed experiences will vary, particularly when accessing the internet wirelessly from different devices. Maximum download/upload speeds given are via a wired connection. Internet speeds are not guaranteed due to conditions outside of network control, including customer location, devices, equipment, and access over a wired or wireless connection; see for more information.

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.

This modem comes with Secure WiFi

When leased, our newer modems like this one come with Secure WiFi, which lets you control some advanced features through the CenturyLink app. Note that these in-app features WILL NOT BE AVAILABLE in the modem settings GUI:

  • Access scheduler
  • Service blocking
  • Website blocking

Modem troubleshooting tips

  • Did you know?  If your internet connection is spotty or slow, the best place to start is to reboot your modem.

  • Still not running right? Check to see if your modem firmware is up to date.

Tip: If the firmware link doesn't work, try another browser (Chrome is known to have issues with this kind of link). Or, right-click the link, select "copy link address", then paste the link into a new browser tab.

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