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
Condition: New
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
May 11 – May 15
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Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
Features
- Model MB7621 is recommended for actual cable Internet service speeds up to 900 Mbps. Wirecutter rates this the best modem for most people. A Full-Band Capture Digital Tuner ensures faster, more reliable Internet.
- Pairs with any WiFi router - Seamlessly compatible with any WiFi router to connect all your devices. This cable modem does NOT have a built-in wireless router or telephone call capability.
- Cost-saving solution: Owning your own modem typically saves the average home $156 per year in monthly rental charges. (Savings are shown for Comcast Xfinity and vary by cable service provider.)
Brand: Motorola
Internet service provider: BrightHouse, Charter Spectrum, Comcast Xfinity, Cox, Time Warner Cable
Connectivity Technology: Ethernet
Compatible Devices: Personal Computer
Product Dimensions: 7.25"L x 2.25"W x 7.88"H
Connectivity Technology: Ethernet
Compatible Devices: Personal Computer
Number of Ethernet Ports: 1
Number of Ports: 1
Maximum Downstream Data Transfer Rate: 1000 Megabits Per Second
Maximum Upstream Data Transfer Rate: 246 Megabits Per Second
Data Transfer Rate: 1000 Megabits Per Second
Item Dimensions L x W x H: 7.25"L x 2.25"W x 7.88"H
Color: Black
Brand: Motorola
Internet Service Provider: BrightHouse, Charter Spectrum, Comcast Xfinity, Cox, Time Warner Cable
Modem Type: Cellular modem
UPC: 855631006347
Manufacturer: MTRLC LLC
Built-In Media: MODEM
Item Weight: 1.12 ounces
Warranty Description: 2 YEAR MANUFACTURER
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
May 11 – May 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
I have xfinity performance pro which is rated for 150 mb/s down and 5 mb/s up. I've been using the Arris SB6141 modem which is 8 channel down x 4 channel up, great modem, no issues but it's speed maxed out at 120 mb/s down and 5 mb/s up. I figured what the heck might as well get the speed i'm paying for, so I purchased the Motorola SB7621 which is 24 channel down x 8 channel up. Internet speed is now 180mb/s down and 6mb/s up with a ping of 19ms. I am happy that I am now getting the speed I am paying for. Yes the upload speed didn't change much but that is because xfinity does not support 8 channel up in my area. This means even though this modem supports 8 channel up it only shows 4 active up channels when you log into it, this is not the modems fault, this is xfinity's doing. The download channels are fine, all 24 channels show up and are active. Yes, I could have purchased a 16 channel down and 4 channel up modem and received the same current speeds but at the time of purchase this modem was less than or the same amount as all the 16 x 4 modems. By buying this Motorola I can upgrade my internet speed down the road and still be covered. Another good thing is that this modem has the Broadcom chipset not the Intel puma. The modem comes with good instructions and is well packaged. Setup was a breeze. I didn't have to call xfinity. All I did after I hooked up just the modem to my PC was navigate to motorola.com which brought up the xfinity activation page. Then just log in with your xfinity credentials and follow the prompts. Very easy and welcomed as I didn't want to sit on the phone talking to xfinity support. I never do reviews but I figured this little box deserved one and hopefully this helps someone.
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Reviewed in the United States on March 14, 2018 by PG
Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
Use-Case/Set-up: - Provider: Xfinity/Comcast - Wireless Router: Netgear Nighthawk X6S - Modem: Motorola Model MB7621 (24x8) - Company that designed the Modem's chip: Broadcom ---- - It is true that there are other modems that are cheaper. As someone that has worked in the semi-conductor industry, the (a) quality of the silicone-chip/processor and (b) quality of the materials that are used--are the two main inputs that separates the quality of various modems. This line of Motorola modems are made with chips designed and produced by Broadcom. The quality of the design and integration is more expensive, and (for me) it is worth the slight extra cost. This line of Motorola modems with Broadcom chips are workhorses--quality designs with good build/parts quality that are reliable and endure. - Tip: from a hardware and longevity perspective, it is better to have two devices: a separate modem and a separate wireless router. There are two reasons for this. (1) The lifespan of chips is based primarily based on heat dissipation and usage. (Let your modems and wireless devices 'breathe' as this will increase the 'lifespan'--don't keep them in closed cabinets.). By combining a modem and router into one device, the device has to work that much harder and it will 'run' hotter (thereby decreasing the 'lifespan'). (2) If you purchase a combined modem and router device, and either the modem or router fails (expect about 4-6 years lifespan) then you have to buy a whole new unit each time either the modem or router fails. Usually, either the modem or router will fail before the other--both do not usually fail at the same time. ---- Thus far, this modem has proved to be a very reliable. This modem is currently (as of the writing of this review review), on Xfinity's/Comcast's official 'Supported Hardware' list. ---- Overview: - I have not seen any data through-put slow-down or video/audio lag--even during what are typically 'peak use' times of the day. - Data pull-down (downstream) speed remains consistently high. - Set-up was simple, quick, and easy. - The modem functions very well in conjunction with a Wireless Router made by a different company. - Data transfer speeds between the modem and the wireless router are also consistently high. - The silicon chip used in this generation of Motorola's Cable Modem is well-designed and manufactured; and while it is more expensive, thus far it has been worth it. - Due to the heat output, this modem does need to be kept in a well-ventilated area. Using this modem in a closed-off environment would definitely cause: a decrease in lifespan, a performance degradation, or both. - Overall: Great modem; highly recommended.
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Reviewed in the United States on October 29, 2018 by t-writer
Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
Excellent value. Very easy to setup and keep updated. Used with Xfinity and outside of the occasional reset is worry free
Reviewed in the United States on January 22, 2026 by Amazon Customer
Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
So, I have some screenshots below on my tests with the modem. They stay fairly consistent. I upgraded recently to 500mbps plan on WOW! and they came over, installed a new modem. Well the new modem was complete garbage. It would reboot 1 to 3 times a day and the speed was all over the place. Occasionally would get 400mbps or 30 mbps. It was no telling. Enter the motorola MB7621, which I had another modem that was just as good, but couldn't "deal with" the speeds. So this modem seems to do the trick. Although I am not getting 500mbps, i am get a consistent 250mbps from Time Warner and Spectrum nodes. The Bresco node was even more surprising! I was getting around 40 to 60mbps with Bresco but now I am getting 100mbps. Very happy. Long as the darn modem doesn't reboot every day, i think it will be a win. My wife needs a stable connection on Wednesdays because she works from home. I need a stable connection because occasionally I work from home as well. I also felt that I would never get 500mbps but I don't see how anyone could exceed that speed unless if they were streaming 5 4k movies. 250Mbps is good enough for my family. I hope this is useful someone else. I will try to remember to post an update 6 months later.
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Reviewed in the United States on January 27, 2020 by Tbay007