Best Comcast Xfinity Approved Modems In 2021

Note, no device can get you faster internet speeds than your internet plan provides.

Also, get the device you need. A modem and a router are not the same things. Some types of internet require both others only one. If you are uncertain, click here

In this article, you will find out which modem is the best modem for Comcast Xfinity. As well as a list of all Xfinity-approved modems and what to consider before purchasing one for yourself.

Go to the Full List.

Comcast Xfinity approved modems and routers

As a Network Engineer, I have spent hours testing and researching to find the best Xfinity-compatible modem. 

And I have concluded that Motorola MB8611 is the best modem for Comcast Xfinity. 

Motorola MB8600
Source: Motorola.com

Motorola MB8611 – Editors Choice’s

Best Overall

  • Type: Cable Modem
  • Works up to: 1000 Mbps
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years

But everyone has different internet needs and wants, so what modem you should get depends.

Thus, I have put together this list of the top 6 best Comcast Xfinity modems, so you can pick the one that fits you the best. 

Keep reading to learn more.

Best Approved Xfinity Compatible Modems

Here are the best Comcast Xfinity modems.

  1. Motorola MB8611 (Editors Choice’s – Modem) 
  2. Netgear Nighthawk CM2000V (Best Performer – Modem)
  3. Motorola MB7220 (Budget-Friendly – Modem)
  4. Netgear C7800 (Best Value – Modem/Router Combo)
  5. Netgear Nighthawk CAX80 (Best Performer – Modem/Router Combo)
  6. Motorola MG7540 (Budget-Friendly – Modem/Router Combo)

Top 6 Comcast Xfinity Compatible Modems

Here are the 6 best Comcast Xfinity-approved modems with the best options for your circumstances. 

#1 Motorola MB8611 (Editors Choice’s – Cable Modem) 

Motorola MB8600
Source: Motorola.com
  • Type: Cable Modem
  • Recommended for: Extreme Pro or below (1000 Mbps)
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years
  • Chosen as: Best Overall

The Motorola MB8611 is the perfect option for you with the Extreme Pro plan or below that wants to future-proof your modem.

The MB8611 is such a good modem because it’s both DOCSIS 3.1 and has a 2.5G ethernet port. 

This makes it future-proof because when Xfinity upgrades its internet to DOCSIS 3.1, you won’t have to go get a new modem. And since DOCIS 3.1 is backward compatible, it will work with DOCSIS 3.0. [1]

The 2.5GB ethernet port is also a great feature. Because this makes the modem compatible with internet plans up to 2500 Mbps. 

And even if it feels excessive today, it won’t be in a couple of years. 

Coming with a two-year warranty and excellent support (in my experience anyway), I felt that I couldn’t pick any other modem as the number one choice. 

You should, however, not get the Motorola MB8611 if you know that you will change to Fiber in the future. 

Because this modem is an investment for the future. 

Suppose you will get Fiber in a year or so. In that case, you should get a modem with the minimum requirements for your current internet plan (see table later in the article). 

Overall, the Motorola MB8611 is the modem you can buy and then ignore for the coming years. Because it will be enough for a long time. 




#2 Netgear Nighthawk CM2050V (Best Performer – Cable Modem)

Netgear CM2050V
Source: Netgear.com
  • Type: Cable Modem for Voice
  • Recommended for: Extreme Pro or below (1000 Mbps)
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 1 year
  • Chosen as: Best Performer

The Netgear Nighthawk CM2050V is a cable modem made for Xfinity’s Triple Play plan. This is because as well as providing internet, it also works for Xfinity Voice services. 

It has two integrated phone lines that support a 3-way conference call, which means that you can add a third person to your two-party conversation. 

Furthermore, it also supports call forwarding. This allows you to redirect incoming calls to other phone numbers. 

The modem also supports DOCSIS 3.1 technology. This, together with its 2.5G ethernet port, makes it’s capable of a staggering 2500 Mbps. 

A speed that Comcast doesn’t even offer yet. Enough to download nearly anything in mere minutes. 

It’s worth noting that this modem is not necessary unless you have Xfinity Voice and want extreme internet speeds. 




#3 Motorola MB7220 (Budget-Friendly – Cable Modem)

Motorola MB7220
Source: Motorola.com
  • Type: Cable Modem
  • Recommended for: Performance Pro or below (200 Mbps)
  • Channels: 8×4
  • DOCSIS: 3.0
  • Warranty: 2 years
  • Chosen as: Budget Friendly

The Motorola MB7220 is the best option if you’re on a budget and have the Performance Pro internet plan or below (200Mbps).  

The modem is “just enough modem” that will serve you well for now but is not future-proof.

The reason for this is because it’s DOCSIS 3.1 with only 8×4 channels. Which is the lowest requirement for a modem on Xfinity.

But if you’re on a budget and don’t plan to upgrade your internet plan anytime soon, it’s a great option. 




Link to Router Page

Need a Router To Your Xfinity Modem?

If you don’t get a modem/router combo, you might want a new router for your modem. Luckily, we got you covered in the best routers for Xfinity.

#4 Netgear C7800 (Best Value – Modem/Router Combo)

Netgear C7800
Source: Netgear.com
  • Type: Modem/Router Combo
  • Recommended for: Blast! Pro or below (400 Mbps)
  • Max Wi-Fi Speed: 513.64 Mbps
  • Channel: 32×8
  • DOCSIS: 3.0
  • Warranty: 1 year
  • Chosen as: Best Value

The Netgear C7800 is a good option if you looking for a gateway and has the Blast! Pro internet plan or below. 

In testing, the Wi-Fi averaged 513.64 Mbps from 5 feet using the 5GHz band. 

Other measured speeds were 309.15 Mbps from 25 feet and 155.21 Mbps from 50 feet. These results are remarkable when considering it’s a Wi-Fi 5 router. 

Enough for a family of 5 people to all watch 4K movies simultaneously without any problem. That is as long as your internet plan is fast enough, though. 

The modem is a DOCSIS 3.1 which makes it future-proof and very fast.

In this device, however, the router is actually the limiting factor and not the modem. And the reason I only recommend this device for Blast! Pro is because the router only reached around 500 Mbps. 

You could, of course, use it for a faster plan, but then you won’t get all the speed you pay for. 

The biggest drawback with the C7800 is the lack of features in the router. 

Because it lacks both Parental controls, which allow you to restrict your kid’s actives on the internet. And QoS, which makes it possible to prioritize data on your network. 

Other than that, it’s a solid gateway that provides a lot of value for the money.




#5 Netgear Nighthawk CAX80 (Best Performer – Modem/Router Combo)

Netgear CAX80
Source: Netgear.com
  • Type: Modem/Router Combo
  • Recommended for: Extreme Pro or below (1000 Mbps)
  • Max Wi-Fi speed: 800+ Mbps
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 1 year
  • Chosen as: Best Performer

The Netgear Nighthawk is one of the best gateways I have tested, and it will work for any Xfinity internet plan. 

We didn’t even find its max speed in testing since the internet plan we had access to was only 800 Mpbs. 

The testing results were 800+ Mbps from 5 feet, 583.15 Mbps from 25 feet, and 298.47 Mbps from 50 feet. All using the 5GHz channel. 

These results are incredible for a modem/router combo and would be enough for more than a dozen 4K movie streams at the same time. 

The biggest drawback of the CAX80 is the same as most other modem/router combos. It lacks extra features. 

This means that if you log into the router’s admin panel, you won’t be able to do much from there. 

Things like Parental controls or QoS, which allow you to restrict your kid’s activities online and prioritize data on your network, are nowhere to be seen. 

Furthermore, the CAX80 is honestly a bit excessive if you have an internet plan below 600 Mbps. 

But if you don’t feel like you need the extra features and are looking to get the speeds you are paying for, the CAX80 is a great option.




#6 Motorola MG7540 (Budget-Friendly – Modem/Router Combo)

Motorola MB8600
Source: Motorola.com
  • Type: Modem/Router Combo
  • Recommended for: Performance Pro or below (200 Mbps)
  • Max Wi-Fi speed: 301.85 Mbps
  • Channel: 16×4
  • DOCSIS: 3.0
  • Warranty: 2 years
  • Chosen as: Budget Friendly

If you don’t want to spend too much money and have the Performance Pro internet plan or below, the Motorola MG7540 is perfect for you. 

During testing, its Wi-Fi reached 301.85 Mbps from 5 feet, 102.38 Mbps from 25 feet, and 49.06 Mbps from 50 feet. All using the 5GHz band. 

Considering its price, these are some pretty good results that would be enough for one to three 4K streams. 

The cable modem is DOCSIS 3.0 with 16×4 channels. This means that as long as Comcast doesn’t change to DOCSIS 3.1, it will work. 

The biggest con with MG7540 is actually its range. Which during testing only reached around 70 feet. 

This should be enough for a normal-sized house if you place it somewhere closer to the middle of it, but honestly, it fits best for your average apartment. 

Overall, the MG7540 is a good cheaper option for anyone without too fast of an internet plan. 




Complete List with All Comcast Xfinity Approved Modems 

Here is a list of the Comcast Xfinity approved modems with every modem which is confirmed to be working on Xfinity internet.

BrandModel #With RouterChannelsDOCSISPuma ChipsetVoIP
ARRISCM820ANo8×43.0NoNo
ARRISS33No32×83.1NoNo
ARRISSB6183No16×43.0NoNo
ARRISSB6190No32×83.0YesNo
ARRISSB8200No32×83.1NoNo
ARRISSBG10Yes16×43.0YesNo
ARRISSBG6700-ACYes8×43.0NoNo
ARRISSBG6782-ACYes8×43.0NoNo
ARRISSBG6900-ACYes16×43.0NoNo
ARRISSBG6950AC2Yes16×43.0YesNo
ARRISSBG7400AC2Yes24×83.0YesNo
ARRISSBG7580-ACYes32×83.0YesNo
ARRISSBG7600AC2Yes32×83.0YesNo
ARRISSBG8300Yes32×83.1YesNo
ARRISSBV2402No24×83.0YesYes
ARRISSBV3202No32×83.0YesYes
ARRISSVG2482ACYes24×83.0YesYes
ARRIST25No32×83.1YesYes
ARRISTM822GNo8×43.0NoYes
ARRISTM822RNo8×43.0NoYes
ASUSCM-16No16×43.0NoNo
ASUSCM-32Yes32×83.0YesNo
ASUSCMAX6000Yes32×83.1NoNo
CiscoDPC3008No8×43.0NoNo
D-LinkDCM-301No8×43.0NoNo
HitronCDA-CCCNo4×43.0NoNo
HUMAXHGD310No32×83.1NoNo
LinksysCG6350Yes16×43.0YesNo
LinksysCG7500Yes24×83.0YesNo
LinksysCM3008No8×43.0NoNo
LinksysCM3016No16×43.0YesNo
LinksysCM3024No24×83.0YesNo
MotorolaMB7220No8×43.0NoNo
MotorolaMB7420No16×43.0NoNo
MotorolaMB7621No24×83.0NoNo
MotorolaMB8600No32×83.1NoNo
MotorolaMB8611No32×83.1NoNo
MotorolaMG7315Yes8×43.0NoNo
MotorolaMG7540Yes16×43.0NoNo
MotorolaMG7550Yes16×43.0NoNo
MotorolaMG7700Yes24×83.0NoNo
MotorolaMG8702Yes32×83.1NoNo
MotorolaMT7711Yes24×83.0NoYes
NETGEARC3000-100NASYes8×43.0NoNo
NETGEARC3000v2Yes8×43.0NoNo
NETGEARC3700-100NASYes8×43.0NoNo
NETGEARC3700v2Yes8×43.0NoNo
NETGEARC6220Yes8×43.0NoNo
NETGEARC6230Yes16×43.0NoNo
NETGEARC6250-100NASYes16×43.0NoNo
NETGEARC6300-100NASYes16×43.0YesNo
NETGEARC6300v2Yes16×43.0YesNo
NETGEARC6900Yes24×83.0NoNo
NETGEARC7000-100NASYes24×83.0NoNo
NETGEARC7000v2Yes24×83.0NoNo
NETGEARC7100VYes24×83.0NoYes
NETGEARC7500Yes24×83.0NoNo
NETGEARC7800Yes32×83.1NoNo
NETGEARCM400No8×43.0NoNo
NETGEARCM500No16×43.0NoNo
NETGEARCM500VNo16×43.0NoYes
NETGEARCM600No24×83.0NoNo
NETGEARCM700No32×83.0YesNo
NETGEARCM1000No32×83.1NoNo
NETGEARCM1000v2No32×83.1NoNo
NETGEARCM1000-1AZNASNo32×83.1NoNo
NETGEARCM1100No32×83.1NoNo
NETGEARCM1150VNo32×83.1NoYes
NETGEARCM1200No32×83.1NoNo
NETGEARCM2000No32×83.1NoNo
NETGEARCM2050VNo32×83.1NoYes
NETGEARCAX30Yes32×83.1NoNo
NETGEARCAX80Yes32×83.1NoNo
NETGEARCBR40Yes32×83.0YesNo
NETGEARCBR750Yes32×83.1YesNo
SMC NetworksD3CM1604No16×43.0NoNo
TP-LinkARCHER CR500Yes16×43.0NoNo
TP-LinkARCHER CR700Yes16×43.0NoNo
TP-LinkCR1900Yes24×83.0NoNo
TP-LinkTC-7610No8×43.0NoNo
TP-LinkTC-7620No16×43.0NoNo
TP-LinkTC7650No24×83.0NoNo
TP-LinkTC-W7960Yes8×43.0NoNo

Puma Chipset is a problematic chip some modems and routers use. I recommend avoiding models using it. “Yes” means that the modem uses it, and “No” that it doesn’t.

What to Consider Before Getting a Comcast Xfinity Modem

Before buying a Comcast Xfinity-approved modem, there are some things you should consider to make the best choice possible. For more information, check out the modem buying guide.

Modem/Router Combo Vs. Separate Devices

First, you should decide whatever you want and router/modem combo (gateway) or separate devices. 

The difference is that gateways are a modem and a router put together in one device. While separate is one standalone modem and router which connects with an ethernet cable. 

Both options have their merits, but as a Network Engineer, I recommend getting separate devices. 

Because then you can change one device if it gets outdated or breaks rather than both. As well as providing better performance and more network control. 

This is not to say that gateways are without benefit. They are more convenient, require less setup, and have a generally lower upfront cost. 

And in the case of Comcast, there are plenty of good gateways to pick from. So if you want one you can buy one. 

Separate Pros

  • Better performance
  • Can change one device instead of both
  • More network control

Combo Pros

  • More convenient
  • Often easier setup
  • Cheaper upfront cost

If you are uncertain what to pick, check out the pros and cons of each option here

DOCSIS

DOCSIS is the telecommunications standard that cable modems use to deliver data to and from your home. [3]

Nearly all modems sold nowadays are either DOCSIS 3.0 or DOCSIS 3.1.

The difference is that DOCSIS 3.1 can deliver speeds up to 10 Gbps while 3.0 only provides speeds up to 1 Gbps.

Both options have pros and cons, but generally, DOCSIS 3.0 is enough as long as you don’t have a plan exceeding 1 Gbps.

But for Comcast Xfinity, I actually think getting a DOCSIS 3.1 modem is a good idea. Because it’s a way of future-proofing your modem for the expected speed increases.

For a more detailed overview, check out DOCSIS 3.0 vs. 3.1 – which is best?

Channel Bonding

If you decide to get a DOCSIS 3.0 modem, you also need to consider how many channels you need. 

For a modem to be Xfinity-approved, it needs to have between 8×4 and 32×8 channels. 

The first number is the download channels, while the second one is the upload channels. This is why the second number is lower than the first one. Because most consumers use more downloads than uploads. 

As a rule, the more channels, the faster speed a modem is capable of. Even though you need to consider the DOCSIS protocol to pinpoint the exact capability. 

When picking a modem, you should consider what speeds you need and choose a modem where the channels fit your plan.

See table under speed for some help. 

Speed

This ties into what DOCSIS protocol and channels bonding you should choose. Just make sure the modem’s speed matches or is above the speed of your internet plan. 

Also, note that advertised speed isn’t real-world speed. But rather the maximum speed that modem can achieve in ideal circumstances. 

Something that never occurs outside the testing facility. 

A modem that is too slow for your internet speed will become a bottleneck for your internet. And speeds above what the modem is capable of is impossible. 

Here is a table with what DOCSIS and channels are compatible with what Xfinity plan. 

Xfinity Internet PlanDOCSIS VersionChannels
Performance Starter Plus (50 Mbps)3.0 or 3.18×4 or more
Performance Select (100 Mbps)3.0 or 3.18×4 or more
Performance Pro (200 Mbps)3.0 or 3.18×4 or more
Blast! Pro (400 Mbps)3.0 or 3.116×4 or more
Extreme Pro (800 Mbps)3.0 or 3.132×8
Gigabit (1200 Mbps)3.1N/A

DOCSIS 3.1 modem doesn’t use channels. 

Compatible with Comcast Xfinity

Before you buy a modem, you need to make sure that it is Xfinity-approved. This is nothing to worry about if you choose any of the modems listed above. 

As they are tested by Comcast and will work for Xfinity internet. [4

But if you want another modem that Comcast hasn’t approved, you need to get a cable modem. I would also recommend reading the comments to see if it works for other Comcast customers. 

But it still might not work for you, even if it is a cable modem reported to work for Comcast. This is because the infrastructure differs somewhat in different areas. 

Therefore, I strongly recommend you getting any of the Comcast-approved modems listed above. 

Ethernet ports

Another point to consider when getting a modem or a modem/router combo is how many and what type the ethernet is.

The standard Ethernet port supports 940 Mbps, while some newer ones can support speeds up to 2500 Mbps. 

If you get a modem/router combo and know that you use a wired internet connection. Then you should also take into consideration how many ports you will need. 

Home Size

Depending on your home’s size, you need more or less Wi-Fi coverage. 

Therefore, if you decide to get a modem/router combo, you need to make sure the router signal is strong enough to reach all over your home. 

So if you have a larger home, you need a better router, while smaller homes can get away with a cheaper option. 

You could also use a Wi-Fi repeater to strengthen your signal, but it’s more convenient to simply get a better router. 

Xfinity Voice

If you have Xfinity Voice, you need to make sure the modem you plan to buy supports VOIP (Voice over internet protocol). [5]

The CM2050V listed above is a good option for this. 

How to set up a Comcast modem

To set up a Modem:

  1. Pick a location with good air circulation. This is so the device doesn’t overheat. If you have a Gateway, place it close to the middle of the home as high up as possible. This will improve its Wi-Fi coverage.
  2. Connect the Coax cable and the power cord. Also, connect it to a router with an ethernet cable if you have a standalone modem. 
  3. Follow the instructions manual that comes with the modem/gateway. 
  4. Activate your modem here.

If you have any problems with the setup, you can check out Xfinity’s guide on setting up third-party equipment.

Rent Vs. Buy

Comcast has one of the most expensive renting fees out of all ISPs. It is at $14 a month, or $168 per year. Midco, for example, only has between $3 to $5 a month.

Therefore, I recommend most people buy their own modem or gateway if they are Comcast customers. Because the fees quickly add up to what a new device would cost. 

Even though the modem or gateway you get from Comcast is decent, many third-party options are better. 

The biggest reason to rent your modem is that Comcast offers tech support and free replacements. 

So if you don’t like tech, you might want to consider renting, but otherwise, buying is better. 

For a more detailed overview, you can check out my guide on Rent Vs. Buy Modem & Router

Why Get a Comcast Approved Modem

As already mentioned I recommend most people to buy their modem instead of renting it. And here are some of the main benefits of this.

No Monthly Fee

Comcast has a high renting fee, and it keeps rising. So, a big benefit of getting your modem is that you legally don’t need to pay the renting fee anymore. 

This will save you $168 a year, enough to buy a new modem every year or two. 

Faster Internet

You will also often experience faster speeds with a third-party modem than with the ISP’s modem. 

Even if Comcast’s devices are decent many other options are better. This will be especially noticeable if you change out their gateway to a good third-party option. 

More Control and Features

Even though Xfinity gateway offers many features like parenting controls and multiple networks, it still lacks in many areas. 

You can, for example, not prioritize programs or devices. 

Getting a third-party modem or gateway will give you more control over the device. It will also enable you to get devices with more advanced features. 

Xfinity

FAQ

Here are some common questions regarding Xfinity modems and gateways. 

Can I use my own modem with Comcast?

Yes, you can. You can find the list of all Comcast Xfinity-approved modems on their site or at the list above. 

Does Comcast (Xfinity) sell modems?

No, Xfinity only rents you modems. If you want to buy one, you need to buy a third-party option. 

My third-party modem doesn’t work. What should I do?

First, you need to check if it’s compatible with Xfinity. Do this by searching for the model number on the list of Xfinity-approved modems above.

Then you can check out their guide on how to troubleshoot third-party equipment.

How do I check if a piece of equipment isn’t supported?

You can check if Comcast approves it by either going to their site or search for the model number in the table with all Comcast Xfinity-approved modems above. 

Can I use Third-party modems with Comcast Gigabit internet?

Yes, but you need to get a modem that has DOCSIS 3.1.

My Verdict

Since Comcast is one of the largest internet providers in the US, it has plenty of compatible modems. 

So, there are many options. I have, however, found that Motorola MB8611 is the best option out there for Xfinity internet. 

As it provides a fast internet connection for a reasonable price.