By January 15th, 2018 at 07:41 am

The 5 Best Comcast Xfinity Compatible Modem For 2018

Being the biggest cable operator in the United States of America, most people prefer Comcast to other companies for internet service provision. Comcast has for a long time boasted about the ultra efficiency and superb quality of its services.

However, the majority of the customers of the Internet service provider are usually dissatisfied with the cable modem that they get as a component of the subscription package.

Comcast has realized this and has suggested a list of comcast compatible modems that their customers can use to substitute with what is found out of the box.

Therefore, it is paramount to know about the best modem for Comcast User as indicated by the internet service provider.

Here is a List of the 5 Best Comcast Approved Modems you can buy.


Adapter's NameImageFeaturesCheck Now!

ARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem
ARRIS SURFboard SB6141
8 Download Channels and 4 Upload Channels capable of up to 343 Mbps download and 131 upload speeds. Recommended for Internet Plans up to 100 Mbps.

Wired modem only. Does not include WiFi router or VOIP Telephone adapter. Gigabit Etherent port to connect to PC or Router.

Approved on Comcast Xfinity, Spectrum (Charter, Time Warner, Brighthouse Networks), Cox, Mediacom, Suddenlink and most other US Cable Internet Providers.


Linksys High Speed DOCSIS 3.0 24x8 Cable Modem
Linksys cable modem (CM3024)
Experience high-speed Wi-Fi speeds from your existing ISP plans up to 300 Mbps. Ideal for HD media streaming, simultaneous online gaming, web surfing and more

Features Intel Puma 6 chipset to achieve high-speed downstream and upstream performance.

Compatible with Comcast Xfinity, Time Warner Cable, Charter, Cox, Cablevision, and more. Requires Cable Internet Service


ARRIS SURFboard DOCSIS 3.0 Cable Modem (SB6121)
ARRIS SURFboard SB6121r
2 – Gigabit Ethernet Ports – 10/100/1000 Mbps and 2.4/5.0 Ghz Dual-band concurrent.

Internet speeds based on your Cable providers service - up to 172 Mbps download and 131 Mbps upload. 4 Download and 4 Upload Channels.

802.11ac W-Fi speeds up to 1600 Mbps with Wi-Fi beamforming – max coverage & performance



Motorola 16x4 Cable Modem Model MB7420 686 Mbps DOCSIS 3.0
Motorola 16x4 Cable Modem
This 16x4 DOCSIS 3.0 cable modem provides speeds up to 686 Mbps, sixteen times faster than DOCSIS 2.0. A Full-Band Capture digital tuner ensures a faster, more reliable Internet.

Setup is fast and easy with a few quick steps set out in a Quick Start guide. Experienced USA-based customer support specialists are there to help if you need them.

NETGEAR CM600 (24x8) DOCSIS 3.0 Cable Modem
NETGEAR CM600 cable Modem
Support Cable Internet Service plans up to 300Mbps. Separate router required for WiFi. 24x8 channel bonding.

Compatible with Xfinity from Comcast, Spectrum, Cox, CableONE & more/

DOCSIS 3.0 up to 24x faster download speeds than DOCSIS 2.0


Why You Buy Modem for Comcast and Save $150 Per Year

Although as a new Comcast subscriber you will get a cable modem in the subscription package and of course pay monthly rental fees for it, it is more efficient and economical to buy a new cable modem to substitute the out-of-the-box one.

Comcast has various internet subscriptions which are meant to offer fast internet speeds. However, that doesn’t happen practically and you as a customer can be frustrated by the slow connections. The ISP isn’t to blame for these issues but rather the modem that you are using.

To solve this, you need to buy a new faster cable modem that will be compatible with Comcast. You can always count on the following cable modems that match Comcast Xfinity for superfast internet connections:

1. ARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem -Best Buy Comcast Modem

ARRIS SURFboard SB6141 DOCSIS 3.0 Cable ModemBy supporting IPv4 and IPv6, ARRIS SURFboard SB6141 is compatible with most of the largest cable providers in the United States. Depending on the provider of your cable internet service, the cable gives you an opportunity to enjoy excellently fast download Wi-Fi and upload speeds to a maximum of 343 Mbps and 131 Mbps respectively, thanks to its DOCSIS 3.0 and 802.11ac technologies.

The beam forming utilized by this modem allows you to stream your favorite videos and play online games from any area of your home at ultrafast speeds. Use the cable’s pre-set Wi-Fi security to secure your network from malicious intrusion.


Arris Surfboard has supersonic speed. This enables the user to perform online tasks without experiencing low connectivity. It is recommendable to users who perform multiple tasks on internet because of its multiple channels. However, its lack of power button is a disadvantage to some users.


2. Linksys High Speed DOCSIS 3.0 24×8 Cable Modem – Best for Online Gaming & Streaming

Linksys High Speed DOCSIS 3.0 Cable ModemLinksys DOCSIS 3.0 Cable Modem has added more fun to the playing of online games, streaming HD videos and surfing the web, because of its incredibly fast Wi-Fi speeds to a maximum of 300Mbps. You can use the modem on all main providers of cable services due to its wide-range compatibility.

Therefore, with this modem, you will save some bucks that you would have otherwise used on modem monthly rental fees. Replacing your old modem with Linksys DOCSIS 3.0 Cable Modem is a piece of cake since its setup process is incredibly easy. Besides, the modem comes with a comprehensive and easy startup guide.


With a supersonic speed of up to 300 Mbps Linksys CM3024 is ideal for high bandwidth transfer rates which make it to be a good option for heavy downloads, video streaming and online gaming. However its lack of a back battery can lead to a setback incase of a power failure.


3. ARRIS SURFboard DOCSIS 3.0 Cable Modem (SB6121) – Under Budget

ARRIS SURFboard SB6121 DOCSIS 3.0 Cable Connect ARRIS SURFboard SB6121 Cable Modem to your computer or router using Gigabit Ethernet port. Then, download what you need on the Internet at unbelievably high speeds of up to 172 Mbps. You will finish uploading a file within a brief time over the modem’s four upload channels at speeds up to 131 Mbps.

The router offers you one of a kind online gaming and video streaming experience. No more dead spots in your network area; you will be able to access fast internet connections everywhere within your network. This modem matches all the main cable service providers such as Comcast among others.


ARRIS SB6121 is compatible with major cable providers. This makes it to be compatible with major US Internet providers. With 4×4 channels, online video streaming is an effortless affair. Besides, these numerous channels reduce internet congestion. However, it lacks a wireless router prompting the need to buy a router and a modem separately, hence additional costs.


4. Motorola 16×4 Cable Modem (MB7420), 686 Mbps DOCSIS 3.0 – Best Overall

Motorola 16x4 Cable Modem, Model MB7420

Enjoy reliable and fast internet connections with speeds up to 686 Mbps, thanks to Motorola 16×4 Cable Modem, Model MB7420.The modem has an Ethernet port that allows you to connect your TV, wireless modem as well as play station to your cable network. Once you get this modem, you won’t break your back while trying to use it since its set up process is extremely easy and it is well described in a simple quick start guide.

A compact shape is something about this modem that should excite you especially if you have limited space in your house and you fear that a large-sized modem can fall off due to congestion. Besides, this modem has an alluring design that will most probably match your interior décor.


Motorola MB7420 has multiple advantages among them being its reliability, fast internet and provision of multiple services to the user .This makes Motorola MB7420 the first choice for any internet user as a result of its advantages over other types of modem. However, this model lacks in- built wirelessrouter and the user may be forced to buy the router in a separate package.<


5. NETGEAR CM600 (24×8) DOCSIS 3.0 Cable Modem – For Heavy Duty

 NETGEAR CM600 (24x8) Cable Modem DOCSIS 3.0

With maximum cable internet speeds of 960Mbps, CM600 DOCSIS 3.0 Cable Modem ensures that you enjoy quick and high-end streaming of HD videos, lightening-speed downloads, and ultra fast online games. Its set up process includes very easy-to-understand user web interface which helps you have the modem operating within a very short time without having to call the support team for assistance.

The dual-band technology of the modem offers you uninterrupted internet connections throughout your home. The modem’s USB port allows you to connect your printer or storage device to your network. Additionally, you can control the access to your network by setting up a guest network for some of your users.


NETGEAR CM600 is unique in that it has a port that allows the user to connect his/her printer or storage device to his/her network. It is a lightning-fast speed modem. And its set up process is easy and simple saving the user time to call for assistance from customer care.


The Facts You Know Before Buying

After spotting a cable modem to purchase, you need to confirm if it is going to offer you the value that you are looking for. You should consider the following before you part with your cash:

  • Compatibility with your cable provider: Not all modems work with all cable providers. It can be frustrating to buy one only to find that it isn’t compatible with your ISP. Therefore, it is paramount to check whether the modem appears in the ISP’s list of the compatible modems before you make a purchase. If the provider doesn’t have the list, get relevant information from customer forums or enquire it from the customer care representative.
  • Speed: With fast a fast modem and fast cable Internet plan, you will be able to enjoy fast internet connection speeds. You can know how fast a modem is by confirming whether the modem utilizes DOCSIS 3.0 technology, which helps cable modems offer high internet speeds.
  • Reliability and efficiency: It is vital not to rely only on the modem’s approval by Comcast. Seek to find further information from the relevant customer reviews about the reliability and efficiency of the modem.


Reasons for Purchasing a Cable Modem Router Combo for Accessing the Internet Connection from Xfinity

You’ll most likely come across a modem/router set as you look for a modem for your network. The router/modem unit offers you an opportunity to buy a modem and a router in one box. The two will function from the same box, performing their respective functions.You’ll undoubtedly like the fact that the combo have fewer wires, is easier to set up and has less clutter as compared to buying the two components independently. It looks like a great idea, right? But, wait! In fact, given a chance, I would discourage you from buying this set.

The major drawback of this unit is that you’ll have to replace the whole of it in case you need to upgrade your router. On the other hand, upgrading an independent router is less costly and easier as it won’t interfere with the functioning of your modem.


Buying of a Used Modem for Accessing Comcast Connection: Is it a good idea?

As much as it may seem to be a cheap option, don’t even think about buying a used modem for accessing Comcast internet connection.

There are high chances a modem that’s not new may have been used by another Comcast user, hence added to their accounts.

The other user may be from a different state from where you reside and their account is normally closed. However, the MAC address of the modem remains in their account.

Therefore, you won’t be able to delete the MAC address from the account, hence the inability to add it your account since the address is limited to a single account.

For that reason, you will have to take the used modem to a cable store of Comcast for its verification and addition to your Comcast account.


Final Verdict

  • You shouldn’t continue paying high monthly modem bills while experiencing annoyingly slow cable internet connections. Get the value of your money and replace your slow modem with a one-time purchase fast modem that will make you forget about all your internet issues. Choose the modem which is efficient and reliable, as well as the one that matches your cable internet plan and cable internet service provider.

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