ARRIS SURFboard (16x4) DOCSIS 3.0 Cable Modem. Approved for XFINITY Comcast, Cox, Charter and Most Other Cable Internet Providers for Plans up to 400 Mbps. - Walmart.com
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GL.iNet GL-B1300 Home AC Gigabit Router, 400Mbps(2.4G)+867Mbps(5G) high speed, DDR3L 256MB RAM/32MB FLASH ROM, Wi-Fi Mesh Networking, OpenWrt pre-installed - Newegg.com
5 Best Router For 400 Mbps In 2022- The Ultimate Review With Buying Guide - Smart Network Geek
Best routers for Charter Spectrum | 60Mbps-400Mbps. 2021 Buyer's Guide