6 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 ARRIS G36-RB cable modem router combo is a solid choice for users who need a device approved for Comcast Xfinity, Cox, and Spectrum internet services. It utilizes the latest DOCSIS 3.1 standard, ensuring compatibility with multi-gigabit internet speeds up to 1.2 Gbps, making it suitable for high-speed internet plans. The built-in router supports WiFi 6 (AX3000), providing robust wireless performance for multiple devices and improved coverage throughout your home.

Channel bonding with 4 OFDM channels further enhances data transmission efficiency and speed stability, which is crucial for streaming and gaming applications. Additionally, the four 2.5 Gbps Ethernet ports offer excellent wired connectivity options for those who prefer stable connections for their devices such as PCs or gaming consoles. One significant drawback is the lack of support for cable digital voice services, which could be a limitation for some users. Furthermore, it is not compatible with fiber optic, DSL, or satellite internet providers, restricting its versatility.

The modem is relatively lightweight and compact, making it easy to install and place within your home setup. This device is future-proof to a certain extent, thanks to its advanced DOCSIS 3.1 compatibility and WiFi 6 technology, ensuring it remains relevant as internet speeds and technology evolve. If you primarily use Comcast Xfinity, Cox, or Spectrum and need a modem that offers high-speed internet and strong WiFi performance, the ARRIS G36-RB could be a good fit.