Comcast has the largest market share in the US in both Cable TV and Broadband Cable Internet services. Many of their million subscribers look into replacing their modem or router/modem combo gateway provided to them by Comcast/Xfinity with their own device. In this article we’ll show you the best Modems and Combo devices compatible with Comcast in case you want to buy your own equipment and avoid the monthly cost.
If you are in a hurry, here are the results of our research for the best devices for Comcast Xfinity Internet service.
Best Combo Devices (Modem+Router on same box)
- Best for Performance (Starter, Plus, Pro) – up to 150 Mbps: Netgear C6250 or Netgear c6300
- Best for Blast Pro – up to 250 Mbps: Motorola MG7550 or ARRIS SBG10
- Best for Extreme Pro – up to 400 Mbps: Motorola MG7700
- Best for Gigabit – up to 1,000 Mbps: Netgear C7800 or ARRIS SBG8300
Standalone Cable Modem Devices (no WiFi)
- Best for Performance (Starter, Plus, Pro) – up to 150 Mbps: Netgear CM500
- Best for Blast Pro – up to 250 Mbps: Netgear CM500
- Best for Extreme Pro – up to 400 Mbps: Netgear CM600
- Best for Gigabit – up to 1,000 Mbps: Motorola MB8600
Buying your own device will save you a lot of money per year in rental costs because as you know Comcast (like other cable providers) charges a monthly fee for using their provided modem/router.
Fortunately, Comcast/Xfinity supports third party Internet equipment (i.e standalone cable modems or combo router/modem wifi gateways) and even provides online information about all approved models.
However, if you go through the list of compatible modems and routers you will find more than 70 different equipment without knowing which one is the best for your specific Internet speed tier.
In this article we have researched and selected for you the best Modems and Combo gateways (cable modem with WiFi router on the same box) that are supported by Comcast Xfinity Internet service.
Below you will find the best device in our opinion for each Xfinity Internet service plan such as:
- Performance Starter (up to 15 Mbps)
- Performance Plus (up to 60 Mbps)
- Performance Pro (up to 150 Mbps)
- Blast! Pro (up to 250 Mbps)
- Extreme Pro (up to 400 Mbps)
- Gigabit (up to 1,000 Mbps)
Moreover, we have grouped the Internet devices below in two categories:
- Combo Modem/Router Gateway (Cable modem and WiFi Router in the same box).
- Standalone Cable Modem (this option requires a separate WiFi router).
Table of Contents
- Comparison Table – Combo Devices
- Comparison Table – Cable Modems
- Criteria for selecting the best device
- Combo Modem/Router Models Approved by Comcast – Brief Reviews
- Standalone Cable Modems – Brief Reviews
- Pros and Cons of buying your own device for Xfinity
- What is Better: Combo or Separate Router & Modem?
- How to install your own device with Comcast
Comparison Table – Combo Devices
|MODEL||Netgear C6250-1AZNAS||Motorola MG7550||Motorola MG7700||Netgear C7800|
|Best For (Xfinity Speed)||Performance (Starter, Plus, Pro) – up to 150 Mbps||Blast Pro – up to 250 Mbps||Extreme Pro – up to 400 Mbps||Gigabit – up to 1,000 Mbps|
|Cable Standard||DOCSIS 3.0||DOCSIS 3.0||DOCSIS 3.0||DOCSIS 3.1|
|WiFi Speed||Dual Band AC1600||Dual Band AC1900||Dual Band AC1900||Dual Band AC3200|
|Wired Ethernet Ports||2||4||4||4|
Comparison Table – Cable Modems
|MODEL||Netgear CM500||Netgear CM600||Motorola MB8600|
|Best For (Xfinity Speed)||Performance (Starter, Plus, Pro) – up to 150 Mbps |
Blast Pro – up to 250 Mbps
|Extreme Pro – up to 400 Mbps||Gigabit – up to 1,000 Mbps|
|Cable Standard||DOCSIS 3.0||DOCSIS 3.0||DOCSIS 3.1|
|Wired Ethernet Ports||1||1||4|
Criteria for selecting the best device
In our research we had a few criteria in mind to choose the best device among those approved by Comcast. Specifically, the following criteria were deemed important:
- Minimum DOCSIS 3.0 cable standard. Currently 3.0 and 3.1 are the most widely supported cable protocols and ISPs don’t support lower protocols.
- Minimum 16×4 bonded cable channels. Its rumored that Internet Service Providers (ISPs) will stop supporting smaller channel numbers (e.g 8×4) in the future.
- Broadcom chipset instead of Puma 6 chipset. Modems with the Intel Puma 6 chipset (processor) have several bugs including speed latency and lags. On the other hand, Broadcom chipset is reliable and stable (that’s why we mainly recommend Motorola and Netgear products below).
- Newer model if possible.
- Gigabit LAN ports.
- Future Proof. Its better to buy a modem that supports Internet speeds above your current Xfinity Internet service in order to have room for expansion in the future.
- At least AC1600 WiFi speed (i.e 1600 Mbps max). This is important to support newer technology demands such as HD and UHD video streaming, Internet of Things, Smart Home devices etc.
Combo Modem/Router Models Approved by Comcast – Brief Reviews
Let’s now see a brief review of the top combo modem/router models we are recommending for Xfinity Internet service.
These devices are more expensive than normal standalone cable modems but you will not have to buy a separate WiFi router since this function is already embedded in the box. Since you will be saving from rental fees, you will cover the initial cost in a few months.
1. Netgear C6250 AC1600
This Netgear model is mature, cheap and reliable. It will work great with Xfinity speeds of Performance Starter, Plus or Pro (up to 150Mbps).
You’ll notice streaming HD videos is much faster with this device. Many users noted that the Netgear was extremely easy to set up and quite straightforward to use.
One hardware feature I like with this model is its USB port (USB2.0) combined with ReadyShare app which allows you to share media files over the network or use it as backup storage device. You can buy a 256GB USB flash drive, connect it to the router and use it as backup storage for the whole family.
Managing your router is made simpler with the Genie mobile app that grants controls such as monitoring, connecting and even sharing files. All in all, the Netgear C6250 is a very good choice for modest bandwidth requirements.
- Low Cost for a combo device.
- Easy installation.
- Fast speed and reliable connection.
- Includes parental controls.
- Allows you to share files across different devices with the USB port.
- Features a Guest Network as well as WPS.
- Only 2 Ethernet Ports.
2. Netgear C6300
This is another value for money device which can easily support Comcast Xfinity plans of 150 or 200 Mbps but you get also room for expansions because it can actually go up to 300 Mbps.
It works on DOCSIS 3.0 standard with 16×4 (down/up) bonded channels. What I like about this is its wired connectivity options (4x Gigabit Ethernet ports and one USB) and the pretty good WiFi speed. It supports AC1750 for a total combined speed of 1750 Mbps on the wireless radio.
It is fully supported on Comcast Xfinity as a combo modem/router device and also supports the newest IPv6 which will replace the older IPv4 internet addressing scheme in the near future.
Using the Netgear’s “ReadyShare” technology allows you to connect a USB storage device to its USB port and access your files via the WiFi network. Moreover, you can also stream audio or video that you have stored on the USB device to your playback devices.
- Value-for-money device
- Allows room for expansions in terms of Internet speed
- Plenty of wired ports for connectivity (4x Gigabit wired Ethernet and a USB port)
- Its manual has instructions how to set-up this device specifically for Comcast Xfinity
- Pretty good WiFi speed (AC1750) for moderate use.
- No coaxial cable included in the box (you need to buy one for connecting the modem to the wall)
3. Motorola MG7550
Motorola Internet devices are mostly equipped with the Broadcom chipset which is reliable, secure and high-performance. Broadcom provides also security against Denial of Service attacks which is a plague for Internet connected devices.
The MG7550 is ideal for Comcast Xfinity Blast Pro (up to 250 Mbps) although it can support service speeds of up to 375Mbps, so it is future proof in terms of speed.
With Dual-band AC1900 WiFi speed you have enough bandwidth to support multiple devices in the house.
One tip from me (this is what I do in my own house):
Use the 2.4 Ghz band for the smartphone devices and the higher-speed 5Ghz band for the laptops. The 2.4 Ghz band has longer coverage which is needed for mobile devices. Also, the 5Ghz band will provide better speeds for the more demanding laptops of the family.
- Very good wireless coverage. A user reported very good coverage in 3100 sq.ft brick house (two floors).
- 1900 Mbps (max) Dual band WiFi.
- 4 Gigabit Ethernet ports.
- Increases speed and range of the signal with power boost.
- Mature product.
- Close to this price range, you can find a higher-end model such as the Motorola MG7700 (see below).
4. ARRIS SBG10
The Arris SBG10 is a popular product with high ratings for a good reason. It is reliable, works great with Comcast Xfinity and pretty compact to fit anywhere. It can be used for speed plans up to 250 Mbps.
Many people bought this combo device when Xfinity raised their modem rental fee from $10 to $13 per month. If you saved $13/month it means you will recoup your money in less than a year.
It is equipped with 2x Gigabit ports for connecting wired devices such as gaming consoles, smart TV etc.
Unlike the previous Netgear model above, the SBG10 does not have a USB port.
Its WiFi interface supports 802.11AC at 1600 Mbps which will be enough for a small to medium home (or apartment).
In order to set it up, you can use the Arris app on your mobile device and then call Xfinity to register the device to their systems in order to allow it to work on their network.
- Easy setup
- Not enough wired Gigabit ports (only 2)
- No USB port
5. Motorola MG7700
This is another Comcast supported Motorola option. It is ideal for Xfinity Extreme Pro (up to 400 Mbps) and also has room for expansion in speed since the manufacturer recommends this model for service speeds up to 650 Mbps.
The Motorola MG7700 gateway includes a built-in AC1900 dual-band wireless router that includes a firewall and Power Boost capability. This feature amplifies the WiFi signal for larger coverage in the house (users reported very good coverage in 3400 sq.ft area and even on the 3rd floor of the house).
Regarding hardware ports, it includes 4 Gigabit Ethernet Ports to help you connect home wired devices such as your smart TV, desktop computers, gaming consoles etc.
Overall, this modem/router combo creates a more reliable and stable connection with users reporting enhanced performance in their network. Its design allows you to minimize shelf space and helps improve cooling that elongates the life of the product.
- Very good wireless coverage. A user reported complete coverage in 3 floor house with 3400 sq.ft area.
- 1900 Mbps (max) Dual band WiFi.
- 4 Gigabit Ethernet ports.
- Reliable and secure connection.
- High-speed browsing and download speeds.
- Increases speed and range of the signal with power boost.
- A little bit expensive.
6. Netgear Nighthawk C7800 – DOCSIS 3.1
At the time of this writing, the Netgear C7800 together with the Arris SBG8300 (see below) are the only Comcast approved combo devices (modem + router) for Gigabit Xfinity service.
Actually the new model of C7800 shown above supports speeds that are even higher than Gigabit (up to 2 Gig speed).
This model is a highly effective all-encompassing solution to your internet needs that includes a DOCSIS 3.1 cable modem, a high-performance AC3200 WiFi router and a Gigabit switch (all on the same device).
Being a DOCSIS 3.1 modem, it can work on Xfinity Gigabit (1000 Mbps) service. Actually, only DOCSIS 3.1 protocols are supported on Gigabit cable services (this is true for all ISP providers).
Having 2 USB ports allows you to connect portable Hard Disks for storage (or USB sticks) or even printers for printing over the WiFi network.
Users found that opening new websites was like turning the pages of a book with the high-speed capabilities. Also included is incredible coverage which allows you to access the internet from every nook and corner of your home.
All in all, the Netgear C7800 is perfect for those with larger sized properties who need excellent coverage and exquisitely fast speeds.
- Future Proof supporting both DOCSIS 3.0 (32×8) and DOCSIS 3.1 for Gigabit Internet.
- Extremely fast internet speeds.
- Wider WiFi coverage area.
- Perfect for lag-free online gaming, 4K and UHD video streaming.
- Includes 2 USB ports and a Gigabit wired switch.
- Four amplified and active external antennas for great WiFi coverage.
- It’s the only combo model supported for Xfinity Gigabit service.
7. ARRIS SBG8300 – DOCSIS 3.1
Some months ago, you could hardly find one combo device that supported Gigabit speeds and DOCSIS3.1 protocol. Now, there is a new kid on the block, and is called ARRIS SBG8300.
Together with the Netgear C7800 we have discussed above, these two modem/router combo devices are the only models in the market supporting DOCSIS 3.1 and hence Gigabit Internet Plans. The ARRIS model however is cheaper so you could save some money here.
The SBG8300 is fairly new in the market (released in Mid-2019) and has already received pretty good feedback from customers (although it is not a mature product yet).
This device has the newest tech on board. DOCSIS 3.1 on the cable interface, Wave 2 WiFi support (802.11AC 2350 Mbps), 4x Gigabit wired ports and full support of the Xfinity Gigabit service.
The WiFi capabilities of this Arris device are quite good as well. Supporting Wave 2 wireless with AC2350 speed, it is well suited for an average-sized house with moderate speed requirements.
- Cheaper than competing devices in the market
- Supports modern WiFi standards such as Wave 2 (MU-MIMO, beamforming etc).
- One of the few combo devices supporting DOCSIS 3.1 and Gigabit cable internet plans.
- No USB
- WiFi could be faster (to support more devices)
Standalone Cable Modems – Brief Reviews
This category includes devices which are only cable modems without any WiFi router capabilities. Ofcourse you will need to get a separate WiFi router to share the Internet line with multiple home devices.
In my opinion, having a separate cable modem and WiFi router is a better option compared to the combo devices.
If for example the cable modem or WiFi router breaks down, then you will have to replace only the device that is broken without throwing away the whole combo appliance.
Moreover, if you subscribe to a higher speed internet service, then you just need to buy a faster cable modem without having to replace the whole combo appliance again. The pros of having separate devices are much more than the cons in my opinion.
This is a best seller product in a very low price. Great choice for lower Xfinity tiers like the Performance (Starter, Plus, Pro) of up to 150 Mbps.
Since this is a 16×4 modem, it can actually support up to 300Mbps service speeds therefore we recommend this budget device even for Xfinity Blast Pro of up to 250 Mbps.
The CM500 has been in the market since 2017 and proved its reliability and stability. It is equipped with a Broadcom chipset and unlike the Puma 6, which empowers the CM700, it works flawlessly with the DOCSIS 3.0 protocol.
- Budget choice.
- Slim, sleek design.
- Quick and easy setup.
- Reliable and sturdy connection.
- Clean and easy user interface.
- Reliable Broadcom chipset
- Does not show stats on the web interface.
- A little bit outdated.
2. Netgear CM600
This is one of my personal favorites. With 24×8 bonded channels, it’s great for Xfinity Extreme Pro – up to 400 Mbps (although it is future proof since it can support even higher speeds).
The Netgear CM600 is one of the highest-ranking cable modem devices in terms of customer feedback.
Take a look at some of the popular online forums (like dslreports forum) and you will find raving reviews of users for this particular Netgear device.
Users love the fact that the CM600 is compatible with almost all providers. Furthermore, users remarked that the multiple downloads and upload channels make it a great choice for heavier internet uses.
Overall, the CM600 is a great option which is compatible with multiple service providers. Not only is it fast and easy to use, but it is great value for money as well.
- Excellent customer reviews for this model.
- Compatible with multiple service providers.
- Includes power and a reset button.
- Reliable with its Broadcom chipset.
- Easy management interface.
- Best value for money choice.
- Great ventilation design.
- The status LEDs are awkwardly placed on the box.
3. Motorola MB8600
We have compared and reviewed this modem in our article about the best DOCSIS 3.1 cable modems currently available.
It’s undoubtedly the best modem for Gigabit Internet speeds. Manufactured by Zoom Telephonics, a USA company, this is a robust and great choice for Gigabit service of Xfinity.
Having 4 Gigabit Ethernet ports for LAN connections (although 3 of the ports are hidden behind a plastic label), it can even support more than 1 Gig speeds for future expansion if needed.
A unique feature that many users loved is the Active Queue Management mechanism which allows the system to prioritize packets. As a result, you’ll find that the modem delivers high-speed internet with faster loading websites and more responsive online gaming and video streaming.
Another exquisite feature is the Full Band Capture technology which is suitable for rural areas or areas with weak signals.
So, if you want a modem that lasts long in terms of durability as well as technology, there’s none better than the Motorola MB8600.
- Future Proof for years to come.
- Sleek, elegant design.
- Multiple Gigabit Ethernet ports.
- Includes a priority management system.
- Boosts weak signals.
- Up to date technology.
- High-caliber manufacturer (Zoom Telephonics and Motorola).
- Requires ISP to upgrade the device firmware if needed (actually this is valid for other modems as well but we had to write a con 😊).
4. Best Voice Modem with DOCSIS3.1 (Gigabit Internet)
If you have Xfinity Gigabit Internet and Voice service, the above Netgear CM1150V device is the newest kid on the block. It first appeared in the market at the beginning of 2019 and supports DOCSIS3.1 which is required for getting cable Gigabit speeds. It has 2 telephone ports and 4 Gigabit LAN ports but no WiFi (you will need a separate wireless router).
Pros and Cons of buying your own device for Xfinity
- Obviously, the most important advantage of buying your own device is money savings. You will save $13 per month in device rental fees. Usually, when you buy your own device you will be able to recoup the initial cost in less than a year.
- You get to select the best device in the market for your specific needs. For example, if you have large traffic demands in the family (HD streaming, gaming etc) you can select a device with better WiFi capabilities than the device provided by Comcast.
- You will have full control on the device. This is especially important if you are tech savvy. You will be able to tweak settings as you like, maybe install a VPN on the router etc.
- You will not have support from the provider regarding the router.
- If it breaks, you will have to buy a new one on your own.
What is Better: Combo or Separate Router & Modem?
Although there is a big debate whether its better to buy a combo device (router+modem on the same box) or buy two separate devices, both options have some strong benefits and some drawbacks as well.
Let’s first examine the pros and cons of buying a combo device:
Combo Device Pros
- You don’t have to manage two different devices.
- You save space because there is only one box.
- Its usually cheaper than buying two different devices.
- Fewer wires in the house.
Combo Device Cons
- Usually the WiFi capabilities of combo devices are not that good.
- If you want to upgrade the device (better specs, higher internet plan etc) you must buy a new combo box.
- No flexibility in placement in the house. It must be either close to the coaxial cable outlet or you must run the coaxial cable in the middle of the house.
Now let’s see some pros and cons of having two separate devices (modem and router):
Separate Devices Pros
- You can select a WiFi router with much better specs and performance to suit your needs.
- You have flexibility in placing the separate WiFi router anywhere in the house for better coverage.
- If you upgrade your cable Internet plan, just buy a new modem without changing the router.
- Can upgrade both modem and router separately.
Separate Devices Cons
- Usually costs more
- You must manage two different devices
- Take up more space
- More wires in the house
How to install your own device with Comcast
Comcast makes it easy for their customers to buy and install their own modem or combo device. They even have a webpage showing which devices are compatible for which speed tier.
The page here allows you to input your street address and download speed in order to find which devices are supported by Xfinity.
NOTE: All of the devices mentioned in this article are fully supported by Comcast Xfinity. We just hand-picked the ones we believe are the best in the market right now.
After you receive the compatible device that you have purchased, you need first to disconnect the existing device and then do the following (assuming you have purchased a third-party approved combo device):
- Connect the new device to the power outlet and also connect the coaxial (thick) cable coming out from the wall to the device.
- Power on the device and wait for it to boot-up (few minutes).
- Check the manual of the device to make sure it has booted up completely (usually all lights should stay solid on).
- Connect to the new WiFi network of your new device (check on the box or printed guide to find the new WiFi name and password). You can also connect with an ethernet cable to one of the ports of the device.
- Open a web browser on your laptop or smartphone and go to https://xfinity.com/activate
- Follow the prompts to verify your Xfinity account and proceed to finish the activation process (your new device might reboot or take some time to finish the registration process).
- Make sure to visit some sites on the Internet to verify connectivity.
- Comparison of DOCSIS Cable Modems 8×4 vs 16×4 vs 24×8 vs 32×8
- Comparison of Motorola MG7700 vs MG7550 vs MG7540 Combo Devices
- ARRIS T25 Vs Netgear CM1150v Gigabit Voice Modems for Xfinity
- Netgear CM600 vs CM700 vs CM1000 Cable Modems Comparison
- ASUS ROG Rapture GT-AX11000 vs Netgear Nighthawk AX12 (RAX200)