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Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0

4.4 4.4 out of 5 stars 28,836 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer Networking Modems by Motorola

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Available at a lower price from other sellers that may not offer free Prime shipping.
DOCSIS 3.0 (1 Gbps Ethernet Port)

Purchase options and add-ons

Brand Motorola
Internet service provider Time Warner Cable, Xfinity, Charter Spectrum, Cox
Connectivity Technology Ethernet
Compatible Devices Personal Computer
Product Dimensions 7.25"L x 2.25"W x 7.88"H

About this item

  • Model MB7621 is recommended for actual cable Internet service speeds up to 650 Mbps. Wirecutter rates this “the best modem for most people.” A Full-Band Capture Digital Tuner ensures faster, more reliable Internet.
  • This cable modem's 1 Gigabit Ethernet port connects to a WiFi router, computer, HDTV, game station, or streaming video device. Great for use with Whole Home WiFi or Mesh networks like eero, Google WiFi, and Orbi. (This cable modem does not have a built-in wireless router or telephone call capability. The Motorola MG7315, MG7540, MG7550, and MG7700 have a built-in wireless router.)
  • Requires cable Internet service.Approved by and for use with Comcast Xfinity and Xfinity X1, Cox, Charter Spectrum, Time Warner Cable, BrightHouse, CableOne, SuddenLink, RCN, and other cable service providers. Eliminate cable modem rental fees up to 156 dollars per year. (Savings are shown for Xfinity and vary by cable service provider. No cable modem is compatible with fiber optic, DSL, or satellite services from Verizon, AT&T, CenturyLink, Frontier, and others. Model MB7621 has no phone jack.)
  • Setup is fast and easy using the quick start guide.
  • Attractive, compact design minimizes shelf space, improves cooling, and extends product life while looking great in any home or office. A 2-year warranty plus rugged lightning and power surge circuits protect your investment.
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Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0

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$89.99
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Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0
Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0
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ARRIS SURFboard SB6183-RB DOCSIS 3.0 16x4 Gigabit Cable Modem, Comcast Xfinity, Cox, Spectrum and more, 1 Gbps Port, 400 Mbps Max Internet Speed, Easy Set-up with SURFboard Central App - RENEWED
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Price-18% $89.99
List:$109.99
-20% $119.95
New Price:$149.99
-10% $197.97
List:$219.99
$57.92-15% $169.99
List:$199.99
$39.99
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to install
4.4
3.5
4.2
4.3
4.2
4.3
WiFi signal
3.9
2.5
3.7
3.9
3.8
3.8
Tech Support
3.5
3.5
3.2
3.7
3.4
3.6
For gaming
4.5
4.5
3.8
4.0
Value for money
4.1
3.8
4.0
4.5
Sold By
MTRLC LLC
Motorola Networking Renewed
Verdi!
Abe's Electronics Center
MTRLC LLC
Woot
connectivity tech
Ethernet
Ethernet
Ethernet
Wired
Wi-Fi, Ethernet
Ethernet
ethernet ports
1
1
2
1
4
1
number of ports
1
1
2
8
4
1
data transfer rate
1000 megabits per second
3.8 gigabits per second
2500 megabits per second
680 megabits per second
1 gigabits per second
400 megabits per second
max downstream rate
1000 megabits per second
2500 megabits per second
343 megabits per second
1000 megabits per second
686 megabits per second
max upstream rate
3.8 gigabits per second
2.5 gigabits per second
123 megabits per second
143 megabits per second

Product guides and documents

What's in the box

  • MODEM

  • Product Description

    No modem rental fees. Fast, reliable Internet.
    Family using Internet connected devices.

    The smart choice for your cable Internet service

    Eliminate monthly cable modem rental fees – Typically saves 168 dollars per year in Xfinity cable modem rental fees. Actual savings depend on your service provider.

    800+ Mbps – Maximum actual Internet download speed

    GigE Ethernet port – For a high-speed wired connection to any router, computer, or other Internet-capable device.

    MB7621 cable modem shown with a WiFi router

    Connect any WiFi router you choose

    Plugs easily into any router for shared Internet access by all your WiFi and Ethernet-capable devices. This flexible approach lets you pair this cable modem with any router you choose for your WiFi needs, including a mesh router or gaming router.

    If the MB7621’s Ethernet port isn’t used for a router, it can plug into a computer, HDTV, game station, or other Ethernet device.

    Certified for Comcast Xfinity, Spectrum, and Cox

    MB7621 Fast Easy Set Up Image

    MB7621 supports cable plans up to 900 Mbps

    Compatible with Most Cable Providers

    Certified by Comcast Xfinity, Cox, Charter Spectrum, and other cable providers.

    * Not compatible with Verizon, AT&T, CenturyLink, and other fiber optic, satellite, or DSL services.

    Fast Internet Speed

    Connects fast with just 3 connections - power, coax cable, and Ethernet.

    Supports internet plans with speeds up to 900 Mbps

    For other service providers, supported service speeds are similar to Comcast.

    MB7220 product image MB7420 product image MB7621 product image MB8600 product image Motorola MB8611
    MB7220 MB7420 MB7621 MB8600 MB8611
    Customer Reviews
    4.3 out of 5 stars
    4,311
    4.4 out of 5 stars
    6,311
    4.4 out of 5 stars
    28,836
    4.4 out of 5 stars
    28,836
    4.4 out of 5 stars
    28,836
    Product Type (This table only includes cable modems with NO built-in WiFi router) 8x4 Cable Modem 16x4 Cable Modem 24x8 Cable Modem DOCSIS 3.1 plus 32x8 3.0 Cable Modem DOCSIS 3.1 plus 32x8 3.0 Cable Modem
    DOCSIS Channel Bonding 8x4 DOCSIS 3.0 16x4 DOCSIS 3.0 24x8 DOCSIS 3.0 DOCSIS 3.1 plus 32x8 DOCSIS 3.0 DOCSIS 3.1 plus 32x8 DOCSIS 3.0
    Certified for These Cable Internet Services. Typically Works with Many Others. Comcast Xfinity, Cox, Spectrum, Sparklight (CableOne), WOW! Comcast Xfinity, Cox, Spectrum, Suddenlink, Sparklight (CableOne) Comcast Xfinity, Cox, Spectrum, Suddenlink, Sparklight (CableOne) Comcast Xfinity, Cox Comcast Xfinity, Cox
    Recommended by Comcast Xfinity for Internet Service This Speed Tier or Below 200 Mbps 300 Mbps 800 Mbps 1000 Mbps 2500 Mbps
    Maximum Internet Download Speed (Actual speeds are lower) 343 Mbps 686 Mbps 1000+ Mbps 1000+ Mbps 2500 Mbps
    Built-in WiFi Router No No No No No
    Gigabit Ethernet Ports 1 1 1 1 1 (2.5 Gbps)
    Works With Any WiFi Router That Has an Ethernet WAN port
    Telephone Ports No No No No No
    What Modem/Router Product is Most Similar to This Modem-Only Product? Yes, MG7315 Yes, MG7540 Yes, MG7700 None, but works with any router that has an Ethernet WAN port Yes, MG8702

    Looking for specific info?

    Product information

    Warranty & Support

    Product Warranty: For warranty information about this product, please click here

    Feedback

    Motorola

    Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0


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    From the brand

    Customer reviews

    4.4 out of 5 stars
    4.4 out of 5
    28,836 global ratings

    Customers say

    Customers are happy with the quality of the modem. They say it works well and has no issues. They are also happy with speed and ease of setup. However, some customers have reported issues with rebooting. They mention that the mode would reboot itself 6 to 8 times a day. Customers have mixed opinions on stability, value, compatibility, and signal strength.

    AI-generated from the text of customer reviews

    2,273 customers mention1,631 positive642 negative

    Customers like the quality of the modem. They mention that the hardware works fine, it works as expected, and it works fantastic together. Customers also say that it's very reliable and has a decent expectation of a great ROI.

    "...Wow. I really like this modem. This is a barebones rock solid dead simple workhorse...." Read more

    "...modem in place with my Erro wifi router and these two work fantastic together!..." Read more

    "I received the modem and it is not working as expected...." Read more

    "...UPDATE JUL2018: The MB8600 is still running like a champ. No issues...." Read more

    1,371 customers mention1,286 positive85 negative

    Customers find the setup of the modem to be very easy. They mention that it's simple, quick, and easy. Some say that the mode is a plug-and-play device that hooks up fast.

    "...It works great and I've had 0 issues with it so far. Easy as plug and play" Read more

    "...I got the Motorola AC2600 4x4 WiFi Smart router. Installation of both devices was very easy. Literally, plug and play...." Read more

    "...So far it appears I worried needlessly. Setup and activation was a breeze...." Read more

    "...Setting up the MB8611 was a breeze. It's a plug-and-play device, so all I had to do was connect it to my coaxial cable, power it on, and it was..." Read more

    1,239 customers mention942 positive297 negative

    Customers like the speed of the modem. They mention that it's much better on their internal network, fast pages load, and there's no lagging or buffering. They say it'll handle higher speeds and is easy to install. Customers also say that the mode is capable of handling higher speeds, resulting in a 40% increase in download speed. They also say the setup is simple, quick, and easy, and that the device continues to run smoothly.

    "...Plus it's blazingly fast." Read more

    "...We haven't had any lagging or any buffering and at peak usage with all persons at home, we have up to 4 smart phones, 3 laptops, 2 iPads and the..." Read more

    "...UPDATE: This modem continues to run so smoothly I don't know it is there except when I look across the room at its satisfying cluster of blinking..." Read more

    "...turned on version 3.1 but; I was provisioned for 150 Mbps and did not see a speed jump. Nine months later, still no Century Link offer...." Read more

    1,531 customers mention672 positive859 negative

    Customers are mixed about the signal strength of the modem. Some mention that the line is dirty, but the mode is good and offers bonded internet connections. However, others say that they could not obtain an Internet connection, the internet connection stopped working, and the LAN connection loses every five minutes.

    "...step did initially lead me to frustration with my modem and router failing to connect as I had the assumption of plug-n-play service...." Read more

    "...That's it. It makes a connection. And hasn't failed since I got it a month or so ago...." Read more

    "...Comcast quickly (according to the lights); but, I could not obtain an Internet connection...." Read more

    "...I've experienced no issues with dropped connections nor spontaneous reboots. Lovin' it." Read more

    480 customers mention300 positive180 negative

    Customers are mixed about the value of the modem. Some mention it's really good value, worth the investment, and the best priced along with speed, while others say that it'll increase the price of an obviously defective modem and is mediocre at best.

    "Pricy, but worth it. Motorola is the go to brand for high quality...." Read more

    "...from the 192.168.100.1 web server, makes it, once again, totally useless." Read more

    "Reasonably priced, easy to install and almost a 40% increase in download speed...." Read more

    "...-The future of modems, great investment at a better price than the Netgear and ARRIS branded 3.1 modems...." Read more

    263 customers mention123 positive140 negative

    Customers are mixed about the stability of the modem. Some mention that it's been stable so far with no issues, while others say that it has intermittent drop outs and the base is very unstable.

    "...Long story short, if you experience repeated reboots and intermittent drop outs then consider it may be the modem...." Read more

    "...And this modem serves as an example. My network is solid. Strongly recommend as a replacement to Netgear" Read more

    "...I will now have to look for another modem since this one just keeps dropping at random." Read more

    "...This cable mode delivers not only the high performance and stability, but absolutely the easiest cable modem installation that I have done yet...." Read more

    233 customers mention88 positive145 negative

    Customers are mixed about the compatibility of the modem. Some mention that it works seamlessly with any WiFi router, providing better WiFi connectivity throughout the house. However, others say that issues changed and the mode was not compatible with their Spectrum plan. The support for modems is buried and it's not currently supported by Spectrum.

    "...gentlemen comment on this review saying that the modem doesn't have any router functionality what so ever and that a separate router was needed...." Read more

    "...This should be good for about 3-5yrs.3. A good compatible router...." Read more

    "...Also not found is the "spectrum analyzer view". These disappointments have cost them 1 star in my review...." Read more

    "...Unfortunately I have to return it in that it is not compatible with my Spectrum plan." Read more

    258 customers mention33 positive225 negative

    Customers are dissatisfied with the rebooting of the modem. They mention that it constantly reboots and gets worse with time. Some say that the modemm would reboot itself 6 to 8 times a day, and that it would reboot automatically. They also say that it randomly restarts for 5 minutes, and fails to reboot a minute later. Some customers also say the modemat would need a hard reboot.

    "...was pretty easy, but after a month and a half, the modem would suddenly reboot with no warning. No power issues...nothing obvious...." Read more

    "...1.5yrs of ownership it has dropped signals numerous of times, needing constant resets...." Read more

    "...I would get intermittent drop out and the modem would reboot itself 6 to 8 times a day...." Read more

    "...After further troubleshooting I determined that the modem itself was rebooting every couple of hours...." Read more

    Very satisfied with the MB8611 after 2 yrs
    5 Stars
    Very satisfied with the MB8611 after 2 yrs
    MB8611 purchased mid 2020 to replace an old Zoom DOCSIS 3.0 modem. Modem has been connected to a Linksys WRT1200ac router running regularly updated DD-WRT firmware since purchase. Both modem/router are sitting behind a small APC battery backup/surge protector (BE600M1). This review is for the MB8611 only and should not be considered valid for the MB8600 or MB7621 nether of which I have purchased/knowledge.The MB8611 was a little higher priced than I hoped but a $50 gift card helped ease the pain. I did lots of research and found the MB8611 was the best fit for my setup and future service upgrades. My Zoom modem was maxed at 343 Mbps DL where as the MB8611 could handle up to 2.5 Gbps which was nearly double what my router can handle. When MB8611 was purchased my service was 100 Mbps, ISP upgraded me to 200 Mbps and with this last ISP upgrade now sits at 300 Mbps. (none of the upgrades were requested)Confirmed all accessories were present so I unboxed and hooked it up. I was surprised to have an active internet connection within a couple of minutes after boot completion. Feeling uneasy about the nearly instant connection I contacted my ISP via phone and went through the process of registering my new modem's MAC address. It may not have been necessary to do so but I felt more confident about a continued connection once my ISP confirmed they saw the new modem and registered the MAC address. BTW, I had checked prior to purchase and found the MB8611 had been newly added to my ISP's list of approved user modems.I was concerned the first couple of weeks but basically have ignored the modem since. After approx 2 yrs I thought I should share my experience. The MB8611's performance has been amazing. The router is rebooted every night but the modem has not been rebooted since purchased. I've had a couple of connection drops but quickly confirmed my ISP was off-line in my area temporarily. With three wired and ten wireless devices the MB8611 has been rock solid. It just works without any intervention from myself. I consider it one of my best investments.The modem sits on top of a file cabinet next to my router. Placing my hands on the sides at the top it is slightly warm and cool at the bottom. I was using QoS on my router but disabled it to try the modem's Active Queue Management (AQM). With no apparent change in performance I left the router QoS disabled. The modem lights are on solid except for the bottom LAN connection light which blinks constantly. That may be a negative for some?I highly recommend the MB8611. It has been the best modem I've owned to date. I have attached a page from the MB8611 manual that explains the lights color/blinking/status. The modem lights image to the right is my modem's appearance connected to a 300 Mb service. I've also added the rear view of the three similar modems to indicate what the MB8611 back view is (left) compared to the other two available on the MB8611 Amazon page.
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