Motorola MB8611 DOCSIS 3.1 Multi-Gig Cable Modem | Pairs with Any WiFi Router | Approved for Comcast Xfinity, Cox Gigablast, Spectrum | 2.5 Gbps Port | 2500 Mbps Max Internet Speeds
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Availability:
Only 1 left in stock, order soon!
Arrives
Tuesday, Sep 29
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Features
- Ultra-fast DOCSIS 3.1 performance - Delivers true Gigabit-plus speeds. Supports fast internet plans with Comcast Xfinity, Cox, and Spectrum. Backward compatible with 32x8 DOCSIS 3.0. Please check your internet service provider compatibility by tier
- Pairs with any WiFi router - Seamlessly compatible with any WiFi router to connect all your devices. This cable modem is NOT a router or telephone call capability. You must purchase a router separately
- 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. Please check with your internet provider to make sure its compatible with your tier level
- Fast streaming, conferencing, gaming - Applies Active Queue Management (AQM) for reduced Internet latency and better app performance, including online gaming, conferencing, and streaming.
- Extreme cost savings - Owning your own modem typically saves the home $168 per year in monthly rental charges. (Savings described is for Comcast Xfinity and vary by service provider.)
- Built for reliability - Motorola is a worldwide leader in technology people depend on. Comes with a 2-year warranty and free support from our team of USA technicians.
Description
Enjoy a straightforward setup process with just 3 connections - power, coax cable, and Ethernet. High-speed Internet for any computer, smart TV, game station, or other ethernet-capable device. Significantly reduces Internet latency to provide faster page loads, streaming, and video conferencing. Need Additional assistance? Our experienced network support specialists are here to help. Motorola MR2600 Gigabit Router Motorola Q11 WiFi Mesh System Motorola Q14 WiFi Mesh System WiFi Type WiFi 5 WiFi Type WiFi 6 WiFi Type WiFi 6e Max Speeds 2.4 Gbps Max Speeds 3 Gbps Max Speeds 5.4 Gbps Adjustable Antenna Yes Adjustable Antenna No Adjustable Antenna No Expandable No Expandable Yes Expandable Yes Intelligent Mobile App No Intelligent Mobile App Yes, the motosync app Intelligent Mobile App Yes, the motosync app For over 40 years, people have welcomed Motorola Network into their homes, and we don’t take that lightly. We’ve combined our class-leading hardware with intelligent software to deliver the ultimate connected experience for all.
Brand: Motorola
Internet service provider: Charter Spectrum, Comcast Xfinity, Cox Communications, RCN
Connectivity Technology: Ethernet
Compatible Devices: Router
Product Dimensions: 7.25"L x 2.25"W x 7.88"H
Brand: Motorola
Internet Service Provider: Charter Spectrum, Comcast Xfinity, Cox Communications, RCN
Modem Type: Cable
UPC: 855631006644
Unit Count: 1 Count
Manufacturer: MTRLC LLC
Number of Items: 4
Item Weight: 1.1 ounces
Model Number: MB8611
Mfr Part Number: MB861110
Warranty Description: Manufacturer warranty for 2 years from date of purchase
Connectivity Technology: Ethernet
Compatible Devices: Router
Number of Ports: 1
Maximum Downstream Data Transfer Rate: 2500 megabits_per_second
Maximum Upstream Data Transfer Rate: 800 megabits_per_second
Data Transfer Rate: 1 gigabits_per_second
Number of Ethernet Ports: 1
Item Dimensions L x W x H: 7.25"L x 2.25"W x 7.88"H
Color: Black
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 29
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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Top Amazon Reviews
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
I received the modem and it is not working as expected. This may be a problem with my ISP (Comcast) since so many others seem to have had good luck with this product. After spending two hours on the phone with Xfinity support I was finally able to activate this modem. Once it was activated, however, I'm only getting about half of the speed I'm paying for, around 500 Mbps, when my service is gigabit. This is unacceptable considering what I'm paying, not to mention the $170 price of this modem. The Comcast phone tech finally blamed the modem despite it's being near the top of the list of Comcast's recommended equipment and gave me Motorola tech support's phone number. This is already more hassle than it's worth so I'm returning the modem and downgrading my service back to 250 Mb with my trusty old Cisco 3008 modem. This foray into ultra high speed internet has been a bust, disappointed. UPDATE 1: I finally talked Comcast into sending out a tech to check my lines. The modem says it's connected to WAN by 3.1 and I have a gigabit ethernet connection. Also, the last time a Comcast tech was out he was getting anomalous readings on the line, so... They'll be here this Thursday and in the meantime I have a 2.5 Gb NIC on the way and I'm upgrading the wire in my walls to Cat6a. Fingers crossed. UPDATE 2: Replaced the ethernet cable with new Cat6a, no help. First Comcast tech came out and said they'd be sending another to replace my line. Second Comcast tech came out, said he wasn't able test at the back of the modem, blamed my equipment, like freakin' Comcast always does, and left. I'm done, this was far more hassle than it was worth and I just have to accept that I can't have gig speed internet where I live. Sending the modem back and downgrading back to 250 Mb. FINAL UPDATE: Comcast came to my house once again and replaced all of my lines, inside and outside, and they're equipment showed full bandwidth but it only resulted in a minor increase in speed. HOWEVER, I rebooted into Safe Mode + Networking and ran another speed test and got 1200 Mb, faster than what I'm paying for, so at this point the culprit lies within my computer itself, and I suspect my antivirus software, AVG. Anyway, the modem is crazy fast when none of the BS software is loaded so I'm keeping it. The problem is NOT with this modem and it's working as advertised. UPDATE 10/25/22: I've had this modem for over 1.5 years and it's still going strong. I've experienced no issues with dropped connections nor spontaneous reboots. Lovin' it.
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Reviewed in the United States on February 19, 2021 by Formattc
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
This modem was plug and play -- Comcast Xfinity service working great with Net Gear 6WiFi router. Fast -- I am on the 100 MB package, internet-only and I am getting it all and it is fast -- according to SpeedTest.net. And my real-world experience, versus the old modem and router agrees with the gain. The old was 50 or so MB and the internet connections seemed spotty. Happy, happy with the upgrade. UPDATE: Opps, Modem had a problem and mysteriously lost connection from hard wire connect to Comcast internet service. After many attempts .. I contacted Motorola Support and after a couple of email exchanges, they sent me a new, not renew, but brand new Modem. Plugged in, couple of questions from Xfinity and walla, back online. Of course, I had to have a modem that worked and used a backup but it was only for a little over a week and I received the New Modem. Thanks you Jennifer A. at Motorola. Great service and support in getting this problem corrected. Would I buy again? Of course, this modem is great, fast and accepting of my Comcast, Xfinity service.
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Reviewed in the United States on July 19, 2021 by Dan Baxley
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
The Motorola MB8611 DOCSIS 3.1 Multi-Gig modem has been a very reliable product for me. I’ve been impressed with the consistent connection and the robust internet speeds I get while using it. The modem performs well during everyday use, including streaming, gaming, downloading, and handling multiple devices at the same time. The connection feels stable, and I appreciate not having to worry about frequent drops or slowdowns. The build quality also feels solid and dependable. If you’re looking for a reliable DOCSIS 3.1 modem that can handle fast internet speeds, the MB8611 is definitely worth considering. Overall, I’m very satisfied with its performance and reliability. Great modem and a noticeable improvement for getting the most out of a fast internet connection!
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Reviewed in the United States on September 3, 2026 by Alexander Cassell
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
I bought this when I upgraded to Comcast gigabit service. After installing, despite very strong signal levels and no errors, I never got anything better than about 500mbit down. However, I had upgraded for the upload speed, which I did get, so I just chalked it up to crappy Comcast. After about six months, we started getting internet disconnections. The modem would just sort of soft-reboot itself. Not a big deal in the middle of the night, but it will absolutely ruin a video call or a streaming movie. It happened sometimes every other day, sometimes three times a day, sometimes once a week. I started monitoring my signal levels and error counts like a hawk, plotting up and downstream power levels, SNR, looking for some correlation to when the reboots came. Then I started calling Comcast. I pointed out that I had never gotten the full speed I was supposed to get and now assumed that they were disconnecting me or something else was going on on their end. Several service trips to check and replace all the lines, connectors, etc yielded nothing. They always, of course, blamed my modem, but I told them that it was basically brand new and clearly wasn't the problem. More complaining and service trips, but nothing got resolved. On a recent service trip, the technician was again adamant that it sounded like the modem. I told him that I still had my DOCSIS 3.0 modem that I had upgraded from when I went to gig, and he pointed out that since it was a 32x8 modem, it could almost do gigabit anyway. So, he activated that for me (which Comcast normally won't do as they require a 3.1 modem, which is why I had to upgrade in the first place) and immediately I got 750+ mbit. So, we decided to leave that in place for a couple weeks and see how it was for stability. Well, what do you know, ZERO disconnections with my old Arris modem. I was pretty annoyed. I called Motorola (which is actually Zoom, who just bought the brand). It took no convincing them that the modem was broken, which is both good and bad. They didn't even ask me questions, after I explained the behavior they were eager to send me another one. That was almost too easy, which makes me think it's common failure mode. So, it's great that they're sending me another modem, although (a) I have to *pay* to send the old one back and (b) I no longer have any trust in their product. So I dunno what I'm going to do with the replacement motorola. Either keep it on the shelf as a backup or sell it on eBay. I'm definitely not going to switch back to it. People say Arris is the best, and I think that must be true. My advice is to stay away from this modem and any others by "Motorola" (really, Zoom).
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Reviewed in the United States on April 3, 2022 by Dan
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
First modem was a dud and would not activate with Xfinity. Got it to activate once, but then would not acquire an IP. Replacement had no issue except for a delay in activating. I've nearly doubled my download speed by upgrading to this from a DOCSIS 3.0 Arris while on a 800 Mbps plan. Previous download limit was about 540 Mbps, now I'm reaching nearly 1 Gbps. Very pleased with that. The modem also runs a lot cooler than my previous, albeit smaller, Arris. Deducting a star for one important (for me) limitation: no ability to disable the status LEDs. I was able to do this with my previous Arris modem, but this $150 modem conspicuously lacks this ability, or any other user-friendly customization abilities that my previous Arris had. Otherwise, great modem.
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Reviewed in the United States on March 27, 2022 by AJAL
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
It's a very simple device, which is exactly what I want out of a modem. It has a power button, a reset button, a coax, and an Ethernet/RJ45 port, and then a few LED indicators that are easy to interpret with the quick-start guide (but have never needed to apart from dealing with Xfinity, because the modem works like a charm). My area hasn't been graced by our benefactors with symmetric or multigig plans yet, but this modem has carried the full bandwidth of my plans for five years without fail, up to 1.17 Gbps/42 Mbps throughput (the max I've been offered so far). I have no reason to think it couldn't do 2.5 Gbps, though.
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Reviewed in the United States on September 1, 2026 by Ethan
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
Got this in time for the beginning of 2023. That's when my ISP Xfinity/Comcast raised the rental rate on their modem equipment, to the point where I thought (finally, duh) I shouldn't pay $180 a year in rental when I can outright own a modem for the same one-time-only price and it's future-proof at DOCSIS 3.1. I realize there are over 25,000 other reviews on this gear, so I'm likely not saying anything you haven't already read, but... This Motorola MB8611 DOCSIS 3.1 is indeed approved by Xfinity/Comcast. Installation was easy (plug it into AC power, attach Xfinity coax cable; wait on attaching ethernet to your router/wifi. Get the Xfinity app for your phone (both Android and Apple) and follow the instruction prompts. Within minutes your Motorola is activated. Plug-in the ethernet cable, attach the other end to your router/wifi (I have an average Belkin) and you're done! The best part? You don't have to talk to any humans at Xfinity/Comcast (remember those days?). Minor irritation: There's a data activity light on the front of the modem that constantly blinks (brightly). I covered it with a piece of electrical tape. The other indicator lights are dim green and blue and do not blink unless there's a fault issue (or you boot it up). Hint: There are a few good YouTube instructionals on installing this modem. I think they're worth watching.
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Reviewed in the United States on January 3, 2023 by Brad Mpls
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
If you are using Xfinity or COMCAST, do NOT use this modem. Even though the Xfinity site states it will work, it does not. I have tried 2 different modems and they both had issues of dropping connections all the time. Incredibly inconvenient as I work from home and they always drop during a conference/video call. It is a known issue. The Xfinity Forums have a bunch of posts with people having issues with the Motorola MB8611. It worked great on non-Xfinity/COMCAST service. Very disappointed, and a very expensive mistake. Missed the window to ship it back to Amazon, so now have to try and sell on Ebay or something. Not happy. Update: I was wrong. It appears to work, but Xfinity service to the house was bad. Having gone through 3 modems and diligently troubleshooting the wiring in the house, it worked out to be an Xfinity issue.
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Reviewed in the United States on February 20, 2023 by J. Simonds