5 Best Xfinity Cable Modems 2025 in the United States

The ARRIS (S34) cable modem is a robust choice for those looking to save on rental fees and want a high-performance modem. It supports the latest DOCSIS 3.1 standard, making it 10 times faster than the older DOCSIS 3.0, and offers excellent security features. It is compatible with major ISPs like Comcast Xfinity, Cox, and Spectrum, and supports internet speed plans up to 2.5 Gbps, which makes it future-proof for upcoming multi-gigabit internet plans.

The modem is optimized for next-generation upload speeds thanks to switchable upstream filters, although this is dependent on your provider's offerings. Setup is straightforward using the SURFboard Central app, but note that it does not have a built-in router, so a separate Wi-Fi router is necessary for networking. The device comes with two Ethernet ports - one 2.5 Gbps port and one 1 Gbps port, allowing for a combined download capacity of up to 3.5 Gbps.

While its dimensions are relatively compact, some users may find it a bit bulky. With a 2-year warranty and positive customer reviews, this modem is reliable, but some might find the initial cost higher compared to renting. For those looking to eliminate rental fees and gain access to high-speed internet, the ARRIS (S34) is an excellent investment.

The ARRIS SURFboard G20 is a robust cable modem router combo that offers a variety of compelling features for home and business users. Utilizing the latest DOCSIS 3.1 technology, it ensures high-speed internet with a maximum capability of 1.0 Gbps and supports multi-gig networking. This makes it an excellent option for those looking to future-proof their internet setup. It also features WiFi 6 (AX3000), which promises better performance and faster speeds for compatible devices, with notable benefits for gaming and streaming activities.

The modem is certified for major U.S. cable internet providers, including Comcast Xfinity, Cox, and Spectrum, which adds to its versatility and ease of use. Users can save on rental fees by owning the modem, potentially reducing their cable bill by up to $180 annually, depending on the provider. Setting up the device is straightforward with the SURFboard Central App, which also offers real-time monitoring and enhanced parental controls.

However, there are some points to consider. While it supports high upload speeds, the actual performance will depend on the service tiers provided by your ISP. Additionally, it may not be necessary for users who do not require ultra-fast internet speeds or those who do not have many connected devices. It's a solid choice for tech-savvy users or households with high internet consumption needs.

The NETGEAR C6300 is a solid choice if you’re looking for a cable modem and WiFi router combined, especially for Xfinity Internet plans up to 400 Mbps. It supports DOCSIS 3.0 with 16 download and 4 upload channels, which helps maintain reliable speeds even during busy times. Its AC1750 WiFi speed can cover around 1,600 sq. ft. and comfortably support up to 25 devices, making it suitable for typical home use including streaming, gaming, and multiple device connections.

The built-in router offers dual-band WiFi with features like beamforming and guest mode, improving wireless coverage and security. Four Gigabit Ethernet ports allow you to connect wired devices like game consoles or smart TVs for a more stable connection. This combo device helps save money by eliminating monthly rental fees from your ISP. It is compatible with certain cable providers like Xfinity, Spectrum, and Cox, but does not support DSL or bundled voice services.

While it is good for current mid-range plans, it lacks DOCSIS 3.1 support, which means it is less future-proof as internet speeds climb beyond 400 Mbps. For the best long-term option or very high-speed plans, you might consider a newer model supporting DOCSIS 3.1. For most users on moderate speed tiers and supported providers, the NETGEAR C6300 delivers reliable performance and decent WiFi coverage at a reasonable price.