6 Best Xfinity Cable Modems 2026 in the United States

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 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 Motorola B12 is a strong choice if you want a fast and reliable cable modem for services like Comcast Xfinity, Cox, or Spectrum. It supports the modern DOCSIS 3.1 standard, which means it can handle very high internet speeds—up to 2.5 Gbps on its 2.5 Gigabit Ethernet port. This makes it a good fit for anyone with a multi-gig internet plan who wants to get the most out of their service. The modem features 32 downstream and 8 upstream channel bonding, which helps maintain stable and fast speeds even during heavy network use.

Unlike modems with a built-in router, the B12 is designed to pair with your own WiFi router, giving you flexibility to choose or upgrade your wireless setup. It includes 2 Ethernet ports, which is enough for connecting to routers or other devices directly. One of the big benefits is that owning this modem can save you money on monthly rental fees from your ISP. It also has Active Queue Management to reduce lag, which helps with gaming, streaming, and video calls.

On the downside, it does not include a built-in WiFi router, so you'll need a separate device for wireless connectivity. Also, it's made mainly for residential use and while compatible with major ISPs, you should double-check with your provider before buying to ensure full compatibility. The 2-year warranty and US-based tech support add peace of mind. For those looking for a future-proof modem that handles very fast speeds well and want to avoid rental fees, the Motorola B12 is a solid pick.