Best Comcast Xfinity Approved Modems

This is a list of the best Comcast-approved modems for your home in 2021. 

Comcast approved modems

As a Network Engineer, I have spent hours researching which is the best Xfinity-compatible modem. 

And I have concluded that Motorola MG8611 is the best modem for Comcast Xfinity. 

Motorola MB8611

Motorola MB8611 – Editors Choice’s

Best Overall

  • Type: Cable Modem
  • Recommended for speed: 1000 Mbps or below
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years return policy

But everyone has different internet needs, 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. 

Let us get started. 

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 C7000 (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 – Modem) 

  • Type: Cable Modem
  • Max speed: 6000 Mbps
  • Recommended for speed: 1000 Mbps or below
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Ethernet Ports: 1 x 2.5G
  • Warranty: 2 years
  • Chosen as: Best Overall 

The Motorola MB8611 has an incredible max download speed of 6000 Mbps. Which translates to a real-world speed of around 1000 Mbps. 

A speed so fast that if you could theoretically download GTA V (60GB game) in 60 seconds. Of course, no ordinary computer could handle it, but the modem could. 

It has a channel bonding of 32×8 with DOCSIS 3.0, which gives it an upload speed of around 200 Mbps. Enough for uploading large files and play any game. [1]

This modem also supports DOCSIS 3.1. This makes it a good option for anyone with an Xfinity Gigabit plan.

 Motorola MB8611 is especially good for this because in contrast to many other DOCSIS 3.1 cable modems it has a 2.5G ethernet port. Which will allow for greater speeds than the real-world speed if you have DOCSIS 3.1. 

Coming with a two-year warranty I felt that I could not pick any other modem as number one on this list. 

Some people have, however, had problems with decreasing performance after 6-12 months. Luckily the warranty lasts 2 years so if it happened you can ask for a new one. 

#2 Netgear Nighthawk CM2050V (Best Performer – Modem)

  • Type: Cable Modem
  • Max speed: 2500 Mbps
  • Recommended for speed: 1500 Mbps or below
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Ethernet Ports: 1 x 2.5G
  • 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. 

Besides, it makes it possible to see the caller ID on your TV, so you can decide if you want to answer or not. 

Also, the modem supports DOCSIS 3.1 technology. This makes the speed it’s capable of a staggering 1500 Mbps. A speed that Comcast doesn’t even offer yet. Enough to download nearly anything in mere minutes. 

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

#3 Motorola MB7220 (Budget-Friendly – Modem)

  • Type: Cable Modem
  • Max speed: 343 Mbps
  • Recommended for speed: 200 Mbps or below
  • Channel bonding: 8×4
  • DOCSIS: 3.0
  • Ethernet Ports: 1 x 1G
  • Warranty: 2 years
  • Chosen as: Budget-Friedly

The Motorola MB7220 is DOCSIS 3.0 cable modem. This option is best for you with internet plans Performance Pro or below. 

With a real-world download speed of 200 Mbps and an upload speed of around 80 Mbps. Enough for watching multiple HD movies at the same time.

The modem has a channel bonding of 8×4 and DOCSIS 3.0, which is why it won’t work for Xfinity Gigabit plans. 

But as long as you plan not to upgrade anytime soon then it’s a great option. 

#4 Netgear C7000 (Best Value – Modem/Router Combo)

  • Type: Modem/Router Combo
  • Max speed: 1900 Mbps
  • Recommended for speed: 400 Mbps or below
  • Channel bonding: 24×8
  • DOCSIS: 3.0
  • Ethernet Ports: 4 x 1G
  • Warranty: 1 year
  • Chosen as: Best Value

The Netgear C7000 is the first gateway in this list. With a real-world download speed of 400 Mbps and a max upload speed of 246Mbps. Which with Comcast is enough for any cable plan. 

This speed is enough to stream multiple HD movies at once. Or playing any computer game.

The router has coverage up to 1800 sq ft, but this is under perfect circumstances. Inside, where the router is surrounded by walls and obstacles the range will be around half. [2]

This should still, however, be enough for most homes. 

You can also choose between 2.4 GHz and 5GHz signal frequencies. The difference being that 2.4 GHzhave longer-range but slower speed. And 5 GHz is faster but has a shorter range.

The one con with this gateway is that it has problems with VPNs. This might be a problem if you use a VPN to work from home. 

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

  • Type: Modem/Router Combo
  • Max speed: 6000 Mbps
  • Recommended for speed: 2500 Mbps or below
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Ethernet Ports: 4 x 1G & 1 x 2.5G
  • Warranty: 1 year
  • Chosen as: Best Performer

The Netgear Nighthawk CAX80 is the most extreme device on this list. With a real-world download speed of 2000 Mbps, it’s one of the fastest devices available. 

And with four 1G ports and one 2.5GB port, it will deliver Wi-Fi and wired signal at high speeds. 

It also has both 2.4 GHz and 5 GHz. Allowing you to pick the best for your home, as 2.4 GHz has a longer range while 5 GHz has faster speeds.

This gateway is also perfect for you with a large home, because it has Wi-Fi coverage of up to 3000 sq. ft.

I would not recommend this gateway unless you have an Xfinity Gigabit plan or a large home, because it’s not the cheapest option. 

Moreover, some people have reporter problems with the coax cable, so if you notice anything wrong with it I would ask for a new one. 

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

  • Type: Modem/Router Combo
  • Max speed: 686 Mbps
  • Recommended for speed: 300 Mbps or below
  • Channel bonding: 16×4
  • DOCSIS: 3.0
  • Ethernet Ports: 4 x 1G
  • Warranty: 2 years
  • Chosen as: Budget-Friendly

If you don’t want to spend too much money but still get something with decent speed then Motorola MG7540 is perfect for you. 

It has a real-world download speed of around 300 Mbps and an upload of around 40 Mbps. This is enough to have multiple devices using the internet at the same time. As well as uploading normally sized files to the internet. 

It is limited in its capacity for wired internet connection, as it only has two ethernet ports. So if you have a lot of wired devices you need to get a switch. 

It also supports both 2.4 GHz and 5GHz. And as mentioned before, 2.4 GHz has a better range while 5 GHz is faster. 

It’s a good option for anyone with an internet plan below 300 Mbps who don’t want to spend too much money. 

List with 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
SMC NetworksD3CM1604No16×43.0NoNo
TP-LinkARCHER CR500Yes16×43.0NoNo
TP-LinkARCHER CR700Yes16×43.0NoNo

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.

Combo Vs. Separate

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 my recommendation is to get separate devices. Because then you can change one device if it gets outdated or breaks rather than both. 

The pro with a gateway is that they are more convenient and require less setup. 

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

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

Channel Bonding

When looking at Xfinity-approved modems you will find that cable modems have something called channel bonding. Most 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 most often 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. 

With Comcast Xfinity internet you have a much lower upload speed than download speed. 


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 can deliver speed up to 1 Gbps.

There are pros and cons with both options, 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?


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 perfect 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. 

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 some other modem that isn’t approved by Comcast, 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 speeds of 940 Mbps with some newer ones that can support speeds up to 2500 Mbps. 

If you get a modem/router combo and know that 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 also try to place it in the middle of the home and 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. 

If you get any problems with the setup up you can check out Xfinity’s guide on how to set 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 a Comcast customer. 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 a lot of 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. 



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 it’s approved by Comcast 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 fast internet connection for a reasonable price.