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A Guide to Xfinity Compatible Modems

Xfinity is undoubtedly one of the largest cable internet service providers (ISPs) in the country, with an impressive range of broadband options. You can potentially save lots of money that you would usually spend on renting an Xfinity xFi Gateway modem if you opt to buy your own Xfinity compatible modem. The xFi Gateway rental fee averages $14/month, meaning you can save over $168 a year if you purchase your own modem. To make modem shopping easier, we’ve sorted through a massive list of Xfinity-approved modems and highlighted the top 7 options.

Motorola MB8611

The Motorola MB8611 is acclaimed as a powerful, feature-packed, and future-proof device cut out for multi-gig internet plans. If speed is your main concern, you are set with the MB861. When tested with a gigabit internet plan, it can reach a maximum wireless speed of 930Mbps. It is also one of the few DOCSIS 3.1 powered modems designed for future internet plans. The hardware setup deserves a special mention too. There is 128MB of storage space to optimize the firmware functionality, and unmatched hardware configurations, including ARM-powered performance boosts. It is also equipped with proactive circuitry to handle power surges easily and guarantee a longer lifespan. The modem also supports IPv4 and IPv6 standards for better auto-configuration and dynamic Quality of Service (QoS).


  • Futuristic design
  • Minimal heating, runs cool
  • Multi-gig support
  • Easy to configure


  • Only one Ethernet port

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Netgear Nighthawk CM2050V

The Netgear Nighthawk CM2050V is a cable modem purposely designed for Xfinity’s Triple Play plan. Apart from delivering internet service, the modem also works with Xfinity Voice services. It supports DOCSIS 3.1 technology and has a 2.5G Ethernet port that makes it capable of reaching speeds of up to 2500Mbps. This modem supports multi-gig Ethernet thanks to the 2.5Gbps Ethernet port for the fastest, true multi-gig internet connections. Ideally, you can connect a Wi-Fi router to this modem’s ethernet port to support all your wireless devices. However, for the fastest speeds, consider connecting it to a NETGEAR Wi-Fi 6 router or Orbi Mesh system. As for voice phone support, the modem is optimized for use with Xfinity Voice service and has two telephone lines with unmatched features such as caller ID, 3-way conferencing, call forwarding, and more.


  • Future-proof with DOCSIS 3.1 technology
  • Excellent speed capabilities
  • Two integrated phone lines


  • A bit pricy

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Motorola MB7220

The Motorola MB7220 is a perfect option for anyone using the Xfinity Performance Pro plan or below. It is a DOCSIS 3.0 modem with 8×4 channels, which is the minimum requirement for an Xfinity compatible modem. However, it is the best option if you are not planning to upgrade your internet anytime soon. It provides speeds of up to 343Mbps, eight times faster than DOCSIS 2.0. You can leverage the Full-Band Capture digital tuner to achieve faster and more reliable internet to support your needs. Its Ethernet port can connect a range of devices, including computers, laptops, HDTVs, game consoles, and wireless routers.


  • Affordable
  • Reliable speeds
  • Supports a range of devices


  • Not future-proof

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Netgear C7800

This modem is a great option if you are looking for the best modem/router combination. It supports the Xfinity Pro internet plan or below and can deliver speeds of up to 10Gbps downstream and 1Gbps upstream. It is a DOCSIS 3.1 device, meaning it is future-proofed for upcoming internet plans. The modem comes with a powerful 1.5GHz dual-processor which combines with 128MB flash and 512MB RAM to ensure fast wired, wireless, WAN-to-LAN speed. It is also equipped with a 4×4 transmitter/receiver for the 2.4GHz channel and 4×4 for the 5GHz channel.

The main limiting factor for this modem is that there must be a cable between the router and the access point. You could use the modem for a faster plan, but you won’t get the maximum speed that your plan allows. It also does not have parental controls, which means you will not be able to restrict your children’s activities on the internet.


  • Blazing-fast speeds
  • Ideal for a large house
  • Can stream multiple HD videos to multiple devices simultaneously


  • Lack of parental controls

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Netgear Nighthawk CAX80

If you are not looking for extra features in a modem but want to get the speeds you are paying for, this is your best option. Performance-wise, the modem excels and can work with Xfinity internet plans of up to 1200Mbps. Because it is a cable modem/router combo, it only works for cable internet and will have the function of a modem and router in one device. It is a DOCSIS 3.1 modem delivering excellent throughput and offering a theoretical speed of up to 6Gbps.

Apart from reliable speeds, the CAX80 has several Ethernet ports, excellent coverage, and multi-ISP compatibility. It also doubles up as a wireless router, featuring dual-band capabilities. However, it does not have robust parental controls that allow you to restrict your children’s online activities. Furthermore, this modem can be too much if you have an internet plan of below 500Mbps.


  • Very fast
  • Works with many ISPs
  • Future proof
  • Good range


  • Lacks extra features
  • Substandard parental controls
  • No QoS

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Motorola MG7540

The Motorola MG7540 is a great affordable option for anyone with an Xfinity Performance Pro internet plan or below. It is a 16×4 Cable Modem & Dual-Band Wi-Fi Router that gives you two Wi-Fi networks operating simultaneously at the 2.4GHz and 5GHz bands. As for performance, the MG7540 is ideal for multi-user organizations due to a very high data speed rate. It is a powerful device designed for high loads and reliability. Its admirable price, reliable 16-channel download capability, and DOCSIS 3.0 compatibility meet the requirements of many cable internet companies.

Other notable features include 4-gigabit Ethernet LAN ports that provide wired connections to multiple devices and a vertical design that minimizes shelf space and improves cooling. The most significant limitation of this modem is its range of around 70 feet. This should be enough for an average house if you place it in a centralized location, but it is probably better for an apartment.


  • Power boost technology for higher Wi-Fi speed
  • Easy setup
  • Works with Alexa
  • Can be installed in various positions


  • Hypersensitive to interference from other nearby Wi-Fi devices
  • Limited range

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Arris SURFboard G36

The ARRIS-SURFboard G36 delivers very high-speed connectivity and great performance for online gaming and streaming services. Spec-wise, this modem is ideal for a small office networks needing fast speeds for both wireless and wired devices. It comes with Wi-Fi 6 support, multi-gig networking capability, and cutting-edge DOCSIS 3.1 technology. Powered by an Intel Puma 2-core processor of up to 2.5GHz frequency, this modem can handle multiple devices simultaneously with no network congestion.

What makes the ARRIS-SURFboard G36 stand out from the crowd is its 2.5Gbps Ethernet port and four 1Gbps ports to help you maximize your internet plan. Aside from speed, the modem is compatible with DOCSIS 3.1 high-speed internet, making it a future-proof device capable of providing seamless internet service in the future. From a security angle, the modem is packed with IPv6 support and AES encryption to reduce online threats.


  • Reliable connections and superfast speeds
  • DOCSIS 3.1 support makes it future-proof
  • Easy setup


  • High price
  • Not enough wide coverage

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Factors to consider when buying an Xfinity compatible modem

Now that you have a list of quality modems to choose from let us look at the factors that come in handy regarding making purchases.


The first step when buying a modem is to check whether the device or model is compatible with Xfinity internet service. You can check the compatible modems by visiting the ISP website listing all devices compatible with their services.

Speed support

Speed is another crucial element when it comes to purchasing a modem. It is vital that you pick a modem depending on the service package you are subscribed to. Keep in mind the advertised speeds on the manufacturer’s website typically represent the download speed and not upload.

DOCSIS protocols

DOCSIS refers to the technology allowing cable internet providers to send data via coaxial cables to provide broadband support and internet access. DOCSIS compatibility is necessary for reaching higher speeds. The latest version is DOCSIS 3.1, and it is ideal for Gigabit internet speeds. If your ISP offers speeds of 1Gbps and higher, consider buying a modem with DOCSIS 3.1. However, keep in mind modems with DOCSIS 3.1 protocol are more expensive compared to those with DOCSIS 3.0.


If you are using internet plans that are way faster than 1Gbps, consider buying modems with multiple Ethernet ports. A modem with one port is ideal if you need basic internet speeds and access. However, if you are looking at turning your home or office into a networking hub, it is best that you go for modems with multiple ports. Similarly, if you are purchasing a DOCSIS 3.1 modem option for a device with 2 Ethernet ports is ideal.


Modem security is a crucial aspect that must be considered. There are several security concerns regarding using modems because they link your device to the internet. It is, therefore, important that you identify the best cable modem that abides by the rules of data privacy.

You should also check whether the modem you are buying is equipped with features aimed at safeguarding information and preventing unauthorized access, such as WPS or ‘Wi-Fi Protected Setup.’ Other features to look out for include AES encryption, WPA security protocols, WEP, and TKIP factors.

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Frequently asked questions (FAQs)

Does any modem work with Xfinity?

No. Not all modems are certified to work with the Xfinity network. Before buying a modem from a retailer of your choice, check the certified equipment that supports your Xfinity internet package.

Why is my older device not supported by Xfinity?

Older modems may not be supported by Xfinity due to changes in technology. In some cases, older modems were not designed to support the faster speeds and features currently available.

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*Pricing varies by location and availability. Speeds may vary. All prices subject to change; for current pricing and availability visit our internet service page. Prices as of 5/20/22.

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Disclosure | Updater articles are based on our own data and research, independent from partner relationships. We are not compensated by partners for information and opinions presented here. Our Editorial Terms of Service can be found here.

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