10 Best Xfinity Modems 2025 in the United States

The ARRIS SURFboard SB8200 is a robust cable modem designed for high-speed internet access, especially for users of Comcast Xfinity and other major U.S. providers. It utilizes the advanced DOCSIS 3.1 technology, which significantly increases internet speed potential, offering up to 1 Gbps, making it suitable for heavy streaming and gaming. This modem includes two 1-Gigabit Ethernet ports, providing flexibility for wired connections to other devices or a Wi-Fi router.

One of the key advantages of the SB8200 is its ability to save you money in the long run by eliminating the need for rental fees from your ISP, potentially saving up to $168 annually. It’s compatible with various cable internet providers, which adds to its versatility. The device is also designed for easy setup; users simply need to plug it in and follow the instructions via the SURFboard Central App.

There are a few drawbacks to consider. While the built-in features are excellent for standard use, the SB8200 doesn't have a built-in Wi-Fi router. This means you'll need to purchase a separate router for wireless connectivity, which could be an additional expense. Additionally, while the modem is compatible with most major ISPs, it’s important to confirm compatibility with your specific plan to avoid any service interruptions. Some users may find the initial setup challenging if they're not very tech-savvy.

The NETGEAR Nighthawk CM3000-1AZNAS is a solid choice if you’re looking for a modem that works well with Xfinity and other major US cable providers like Spectrum and Cox. It supports the latest DOCSIS 3.1 standard with mid/high-split technology, which means it can handle very fast internet plans—up to 2.5Gbps download speeds and 1Gbps upload speeds. This makes it ideal for users who want to take full advantage of high-speed plans, especially if you enjoy activities like gaming, video calls, and uploading large files.

One standout feature is its 2.5Gbps Ethernet port, allowing you to connect a compatible router for multi-gig internet speeds, or use link aggregation with two Gigabit ports for speeds up to 2Gbps. However, this model does not include a built-in Wi-Fi router, so you will need a separate router to create a wireless network. If paired with a WiFi 6E or WiFi 7 router, it can support cutting-edge wireless performance. It’s also a good investment to avoid monthly rental fees, potentially saving hundreds of dollars per year.

This modem is designed for US markets only, and some users might find it on the pricier side compared to basic models. For those prioritizing speed and future-proofing, especially heavy internet users or families with multiple devices, this modem delivers robust performance and solid ISP approval, making it a dependable choice.

The NETGEAR Nighthawk Cable Modem CM1200 is a robust option for anyone needing high-speed internet up to 2Gbps, making it compatible with most cable internet providers like Xfinity, Spectrum, and Cox. This modem uses the latest DOCSIS 3.1 technology, ensuring faster speeds and better efficiency compared to older standards. The 32x8 channel bonding and OFDM 2x2 further enhance its speed and reliability, which is a significant advantage for heavy internet users, gamers, and streamers.

It is not compatible with DSL providers or fiber services like Verizon and AT&T, so it's important to verify compatibility with your internet provider before purchasing. Another notable feature is the four Gigabit Ethernet ports, allowing for multiple wired connections, which can be beneficial for a home office or gaming setup. The ability to combine two 1G ports into a single 2G port for faster wired connections is also a plus.

The CM1200 doesn't come with a built-in router, meaning you'll need a separate WiFi router for wireless connections, which could be an added expense. Additionally, while the modem offers some basic security features, it might not be as advanced as those found in dedicated modem-router combos. The NETGEAR Nighthawk CM1200 is a solid choice for users looking to replace rental equipment, save on fees, and enjoy high-speed internet, provided they don't mind the need for an additional router for WiFi connectivity.