The best CenturyLink modems are Actiontec C 100A CenturyLink Gateway, and Zyxel C1100Z 802 11n VDSL2 Wireless Gateway CenturyLink. There are additional compatible modems, but it’s recommended that you stick with the CenturyLink modem brand for the best performance. If you’re still not sure about a modem, call CenturyLink directly for further guidance.