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
$99.00
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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:
Only 1 left in stock, order soon!
Arrives
Nov 5 – Nov 9
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At a glance
- Condition
- New
- Model
- B12
- Dimensions
- 3.5"L x 3.5"W x 5.5"H
- Color
- Black
- Modem Type
- Cable
- Built-In Media
- Item
- Data Transfer Rate
- 2.5 Gbps
- Warranty
- 2 year manufacturer warranty
- Works with
- Router
Features 8
- 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
Specs 19
| Brand | Motorola |
|---|---|
| Internet service provider | Comcast Xfinity, Cox, Spectrum, RCN, Astound |
| Connectivity Technology | Ethernet, Wi-Fi |
| Product Dimensions | 3.5"L x 3.5"W x 5.5"H |
| Modem Type | Cable |
| UPC | 850030782045 |
| Unit Count | 1 Count |
| Manufacturer | Motorola |
| Number of Items | 1 |
| Built-In Media | Item |
| Model Number | B12 |
| Mfr Part Number | B12 |
| Number of Ports | 1 |
| Maximum Downstream Data Transfer Rate | 2500 Mbps |
| Maximum Upstream Data Transfer Rate | 2.5 Gbps |
| Data Transfer Rate | 2.5 Gbps |
| 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 |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 5 – Nov 9
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 Pay in 4
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- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Fantastic at it's job.
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
Can’t Reach Motorola Network Support - Don’t Buy
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
I purchased the Motorola B12 Cable Modem expecting reliable performance, but after about one year it failed completely, leaving me without Internet service. What concerned me most was that the modem became extremely hot—especially around the coaxial connector and power plug—to the point where it was uncomfortable to touch. I immediately disconnected it out of concern for safety. I then contacted Motorola support using the email address provided by their AI assistant. Unfortunately, every email was returned with an “Address not found” error, leaving me without any way to obtain assistance. A product failure is disappointing, but inaccurate customer support information made the experience even more frustrating. Based on both the hardware failure and my inability to reach technical support, I cannot recommend the Motorola B12 Cable Modem.
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Reviewed in the United States on August 5, 2026 by Jim A.
Big increase in speed
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
For Xfinity: The installation was as expected. The upstream and downstream scan took - as noted in the set up guide - about 10 to 15 minutes. The process on the app (make sure you have enough of a cell signal to run the app) was very easy. Just scan the barcode on the box when prompted. It took about another 5 minutes of scanning to get activated. The speed is the thing though. My downloads are at least twice as fast previous.
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Reviewed in the United States on September 17, 2026 by V. Testaccio
Good
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Stable connection and really nice form factor. Doesn't heat up as a the priority model. Works perfect..
Reviewed in the United States on September 2, 2026 by Azharuddin Khan
Good, high-quality but ....
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Motorola B12. Connects to Xfinity quickly and easily: 1. Connect the data cable 2. Connect the power supply. 3. Wait 5 minutes. 4. In the Xfinity application, find: "Got new equipment to set up" and click "Activate now". By the way, the mobile application "Motosync" stubbornly refuses to find the modem. It connects and configures from a PC. But there is one problem - a low upload speed 5.16, the rented modem gives an upload speed of 179.78 Maybe this is just my case. I will figure it out.
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Reviewed in the United States on March 15, 2025 by Amazon Customer
So far so good...
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
Nice modem, easy to install
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Easy installation. Up and running within 20 minutes of unboxing.
Reviewed in the United States on August 29, 2026 by MM
Does not fully support Comcast/Xfinity
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
WARNING: If you have Comcast/Xfinity, these (MB8611 and B12) modems may not be supported. While they are DOCSIS 3.1, they do not support OFDMA upstream connections which makes them completely unsuitable for internet plans that expect that. I have a Comcast/Xfinity 2Gbps/300Mbps service, and neither of these routers worked properly for me. This was a drop-in replacement, reusing all of the same connections and settings as the CODA56 modem, and it destroyed my connectivity. This thing just bottlenecks all to hell and basically just lags out any time it's pushed. My download speeds top out at 500Mbps (it's supposed to be 2Gbps), and my upload speed is a paltry 5Mbps, a far cry from the 300Mbps it's supposed to be. Even worse, the latency jumps massively any time there is any activity. For those curious, my router is set to limit my 2Gbps service to 1500Mbps which completely alleviated any lag/buffer bloat when running the CODA56. The performance the "Nex Gen" MB8611 is getting is abysmal. Given the name of the product says "Nex Gen" when they meant "Next Gen" kinda says a lot about the expected quality you can get from Motorola these days... I replaced this trash with the Arris S34 which does support OFDMA. The CODA56 also supports OFDMA and is a decent alternative as well.
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Reviewed in the United States on April 9, 2025 by Paul E.