Motorola B12 - Advanced Compact Cable Modem | Pairs with Any WiFi Router | Supports Comcast Xfinity, Cox, Spectrum | 2500 Mbps Max | DOCSIS 3.1 | 2.5 Gbps Port | Nex Gen MB8611
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
Monday, Jul 6
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Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Features
- Ultra-fast DOCSIS 3.1 performance paired with a 2.5 Gbps ethernet port for true multi-gig internet speeds.
- Approved for Comcast Xfinity, Cox, Spectrum, RCN and Astound and supports the fastest internet plans available. The products are residential only. Please verify your ISP requirements prior to purchase.
- Superior next generation technology but pays for itself. Owning your own modem eliminates up to $168 per year in monthly rental charges.
- Fast streaming, conferencing, gaming - Applies Active Queue Management (AQM) for reduced Internet latency and better app performance, including online gaming, conferencing, and streaming.
- Multi-gigabit Ethernet speed - A 2.5 GB Ethernet port delivers true high-speed connectivity to even the fastest routers and computers, providing downstream speeds just below 2,500 Mbps and upstream speeds up to 800 Mbps when supported by your internet service plan.
- This model replaces the MB8611 with 32 x 8 Channel Bonding
- 2 Year Warranty and US Technical Support available
- Technical support available via phone, chat or email. Please contact us for any issues with connecting to service
Brand: Motorola
Internet service provider: Comcast Xfinity, Cox, Spectrum, RCN, Astound
Connectivity Technology: Ethernet, Wi-Fi
Compatible Devices: Router
Product Dimensions: 3.5"L x 3.5"W x 5.5"H
Connectivity Technology: Ethernet, Wi-Fi
Compatible Devices: Router
Number of Ports: 1
Maximum Downstream Data Transfer Rate: 2500 Megabits Per Second
Maximum Upstream Data Transfer Rate: 2.5 Gigabits Per Second
Data Transfer Rate: 2.5 Gigabits Per Second
Number of Ethernet Ports: 1
Item Dimensions L x W x H: 3.5"L x 3.5"W x 5.5"H
Color: Black
Brand: Motorola
Internet Service Provider: Comcast Xfinity, Cox, Spectrum, RCN, Astound
Modem Type: Cable
UPC: 850030782045
Manufacturer: Motorola
Mfr Part Number: B12
Model Number: B12
Unit Count: 1.0 Count
Warranty Description: 2 year manufacturer warranty
Built-In Media: Item
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jul 6
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: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Great product! Wish it had more LEDs to show functions enabled. Received up to 800mbps internet speeds thru free upgrade from Optimum. As soon as their system detected this highly capable new modem, upgrading from an older Motorola model, they bumped my speed for free. Had it about a year now. So far, pretty trouble-free. Get the occasional drop-off but immediate restoration. Signal? Modem? Unknown?
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Reviewed in the United States on May 26, 2026 by D4D
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
I purchased this particular Motorola B12 modem in response to Spectrum's upcoming exclusive shift to DOCSIS 3.1 internet in San Antonio, starting January 2026. The upgrade from an outdated 10 year old Tp-Link DOCSIS 3.0 modem was prompted by persistent disconnections, likely due to Spectrum's signal management in last few weeks of December 2025. The B12 was chosen because it lacks unnecessary or expensive features, aligning with my existing Deco 90 mesh WiFi system. After a week, the modem has performed reliably, and setup was straightforward without needing the online Motorola app, which cannot recognize the device due to its lack of a built-in WiFi module for adjusting mostly WiFi features as seen in their promotional materials.
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Reviewed in the United States on December 21, 2025 by Robo
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
The modem I recieved came in a new box, ethernet cord and power plug with a used modem. Modem was covered in dust and finger prints. Set up was easy and initialy worked great. Next morning I had no internet connection. After rebooting it three times it came to life. Next day no internet connection again. It would not reboot all though the lights indicated it was good. I worked with my internet provider and they could see the modem and sent a reboot signal which it recieved but no internet. Tried another reboot and it came to life. Guess there was a reason it was previously returned. Amazon is sending me a new one Friday and will see what I get. Will update my review later. Update: I recieved a new modem. Again setup was quick and easy. Worked great for 3 days and then "NO INTERNET". Several reboots and starts working. Next morning same thing. Again I am with Xfinity 1G plan. I never had this problem before. Returning again.
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Reviewed in the United States on February 25, 2026 by Cheryl A. Forry
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Slower connection to Xfinity than shown (15 minutes), but if you're patient this will self-register. I took a different route and attempted to add the MAC address into my list of authorized Xfinity devices through their app, but requires continuious network connectivity, So once you've disconnected your old cable modem (unless you have a splitter), your internet goes down. My experience was just over 30 minutes, but it works perfect. The 4-5 page fold out instructions show different variations of blinking, pulsing, or steady light to indicate status. The modem will restart several times as it binds to your provider, downloads updates, and reboots, but the lights are a very mellow version of status. When it is all the way online and functional, it will be a solid wite light. The light is neither distracting nor obnioxious. I run a TPLink Archer BE800 Wifi 7 Router, and that also took a few minutes to integrate, but the delay was on me having forgotten that one of the 2 10G ports is primary. Once I remembered that I was up instantly. I greatly appreciate the small and blend into the background nature of the modem. So many of the cable modems are a loud color, tall, or Christmas Tree of bright indicator lights. This modem focuses specifically on a connection to your cable provider, and does not address wifi, or providing additional ports. It is perfect for my needs since I have the new TPLink Archer. This for me was a choice with specific intent, as I like function separation, that way if one fails the cost to get back on line is far less expensive. But from the selections currently available I did not see a combo Modem/Router that was DOCSIS 3.1 along with Wifi 7 and 10 G ports.
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Reviewed in the United States on April 24, 2025 by Randy Browning
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Works fine with Mediacom, May 2026. Kinda bad chassis design, I'm concerned about the heat it puts out. I got one of the weird "moldy"/dusty ones, can't tell if it's just poorly dyed fabric threads that are fading or manufacturing gunk (yeah, the cozy fabric covered can design is probably what makes the modem hot, idk what was wrong with the original 8611 design). Hopefully this is actually high split and all that other technical hooey, because it's getting old having to spend $150-$300 on a modem every 5 years for what is a not-long-for-this-world technology in an age of fiber optics. Getting 1,000 Mbps down and <50 up on a Saturday evening, par for my service plan. Guess I'm happy.
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Reviewed in the United States on May 24, 2026 by Sig
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Outstanding, once ISP got their act together the modem has performed flawlessly. Way smaller than the previous Netgear router & only 1 light to tell you if it’s working or not. Definitely would recommend.
Reviewed in the United States on May 27, 2026 Reviewed in the United States on May 27, 2026 by Larry Larkins
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Tried purchasing a used one to save some money, but it seems like I should have just saved my time instead. This unit doesn’t support OFDMA uploads and adding the modem’s MAC address to xfinity’s 1G service was impossible. Loved the updated look, but beware of this one.
Reviewed in the United States on March 27, 2026 Reviewed in the United States on March 27, 2026 by Drew
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Easy to set up. Up and running quickly
Reviewed in the United States on May 26, 2026 by Liz Ginebaugh