Updated June 2022
Header Image
Why trust BestReviews?
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
Bottom line
Best of the Best
NETGEAR Nighthawk Multi-Gig Cable Modem with Voice CM2050V
Nighthawk Multi-Gig Cable Modem with Voice CM2050V
Check Price
Bottom Line

For the DOCSIS 3.1 speeds and powerful feature set that supports Comcast Xfinity Voice, choose this one from Netgear's Nighthawk line.


DOCSIS 3.1 modem capable of supporting Comcast's 2.5 Gbps plans for the fastest speeds. Offers 2 phone ports for Xfinity Voice. Certified for Xfinity Triple Play. Sports multi-gigabit Ethernet wired networking.


Does not include a wireless outer. Comcast/Xfinity only.

Best Bang for the Buck
ARRIS SVG2482AC Cable Modem & Router
SVG2482AC Cable Modem & Router
Check Price
Versatile Convenience
Bottom Line

Fast, strong WiFi connectivity, up to 1 Gbps download speed, and convenient triple-play compatibility make this a top DOCSIS 3.0 modem.


DOCSIS 3.0 modem/router combo with phone ports. Runs Comcast internet, voice, video plans with no problems. Approved for Comcast Xfinity Voice and Triple Play. Very good WiFi range.


Older DOCSIS 3.0 modem is not capable of fastest speeds. Comcast/Xfinity only.

Motorola MB8600 DOCSIS 3.1 Cable Modem
MB8600 DOCSIS 3.1 Cable Modem
Check Price
Most Consistent
Bottom Line

A great model that provides high internet speeds.


Tops speed up to 1 Gbps. Works with all major cable providers and is simple to set up. Works with all WiFi routers and contains an ethernet port. Great investment for Comcast and COX subscribers.


Problems are rare, but Motorola’s support processes are lackluster.

NETGEAR Nighthawk AC1900 Wi-Fi DOCSIS 3.0 Cable Modem Router
Nighthawk AC1900 Wi-Fi DOCSIS 3.0 Cable Modem Router
Check Price
Trusted Brand
Bottom Line

A high-end router that provides blistering-fast WiFi speeds for streaming, gaming, and more.


The 2-by-8 channel bonding enables fast download speeds, and it has a powerful 1.6GHz processor for enhanced gaming and streaming performance. It has 4 integrated ethernet ports and supports cable internet plans with speeds up to 600 Mbps.


It's bulkier than other routers, and some users complained about the setup taking too long.

Motorola MT7711 24X8 Cable Modem/Router with Two Phone Ports
MT7711 24X8 Cable Modem/Router with Two Phone Ports
Check Price
Includes Phone Port
Bottom Line

If you are already paying for Xfinity cable, internet, and telephone services, our tech expert recommends this.


Features 4 1-Gigabit ethernet ports and powerful WiFi connectivity. Beamforming technology focuses on the devices you are currently using. Supports 2 phone lines.


This model exclusively works with Comcast Xfinity. Does not support gigabit speeds.


We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

Category cover

Buying guide for best comcast modems

If you’re a Comcast internet customer, chances are you’ve noticed the monthly fee they tack onto your bill for modem rental. Your cable modem – the device that takes Comcast’s internet signal and makes it available to your home devices – is a vital and powerful little device, but there’s no reason to rent it. In fact, most cable modems pay for themselves in less than a year, making them an easy decision for both your home network and your wallet.

Whether you’re ready to ditch those modem subscription fees or just itching to upgrade your modem, read our shopping guide to get a handle on the essentials, then check out the products above to see our recommended options.

Content Image
If you’re not sure how much data you use each month in your home, you can use Comcast’s Data Usage Overview meter to see the current and past few months’ usage data.

The need for speed: DOCSIS demystified

In certain areas of the U.S., Comcast has deployed their next-generation internet delivery technology, providing homes with gigabit internet speeds that are several orders of magnitude faster than the megabit standard they’re replacing. This enables new technologies like streaming 4K video and high-resolution audio to thrive.

In order to enjoy gigabit downloads, however, you need to have a modem that supports the right Data Over Cable Service Interface Specification (DOCSIS) level.

  • DOCSIS 3.0 modems are ideal for everyday megabit internet. If you only have a few users in your home or you just plain don’t need cutting-edge speeds, a DOCSIS 3.0 modem is more than adequate.

  • DOCSIS 3.1 modems are necessary for gigabit internet speeds and can support more devices consuming large amounts of data simultaneously. DOCSIS 3.1 modems are typically compatible with DOCSIS 3.0 networks, so you can connect legacy devices without a problem.

Content Image
Did you know?
The cliché is true! If you experience any technical problems with a Comcast modem, power-cycling it (turning it off and then on again) is usually the best first step.

Wireless routers in modems

In addition to supplying internet service to your home, many Comcast modems include built-in wireless router functionality to supply WiFi as well. These all-in-one devices eliminate the need for a separate wireless router, which can save money as well as counter or desk space.

That said, most people opt to buy a separate WiFi router from a third party based on the following two priorities.

  • Future WiFi upgrades: If you buy a modem with a built-in wireless router and later decide to upgrade your WiFi, you’ll end up needing to buy a new wireless router anyway. Buying your own wireless router keeps you flexible and lets you upgrade on your own schedule.

  • Security: If a security vulnerability alert occurs (like the flaw found in WPA2 WiFi password security in 2017), it’s up to the wireless router manufacturer to issue an update to fix the issue. With third-party wireless routers, you can expect serious critical flaws to be resolved quickly. In contrast, Comcast’s track record with providing updates is poor, meaning you could remain exposed to security threats for extended periods of time.

Content Image
Comcast certifies many third-party cable modems, but their xFi services, including parental controls and network management services, only work on rented modems. If you want access to xFi features, investigate third-party solutions.


Q. If I buy a modem that includes a wireless router, can I disable the wireless functionality and use my own WiFi router?

A. Yes. While some Comcast modems include wireless routers, in general, it’s better to use a third-party solution. Third-party routers often offer advanced features like the ability to prioritize which devices get the fastest internet speeds.

Q. How long will my cable modem last?

A. Because cable modems don’t generate a lot of heat or have many moving parts, they typically have a long lifespan. At a minimum, you can expect most cable modems to work for at least three to five years.

Q. Will I need to buy network cables when I buy a Comcast modem?

A. Many modems come with the necessary network cables to connect them, but it’s never a bad idea to explore upgrading. You may see network cables labeled with ratings of “Cat 5,” “Cat 5e,” or “Cat 6.” These designations indicate both how fast they can transport data and how much data they can transport at once. The higher the number, the better the overall performance of the cable. If you don’t do a lot of streaming and downloading, a Cat 5 cable would be fine. However, if you have multiple users in your home who will be downloading (or streaming) simultaneously, stick with Cat 5e or Cat 6 cables.

Our Top Picks