Motorola MB8600 DOCSIS 3.1 Cable Modem - Approved for Comcast Xfinity, Cox, and Charter Spectrum, Supports Cable Plans up to 1000 Mbps | 1 Gbps Ethernet Port

Pricy, but worth it. Motorola is the go to brand for high quality. This modem delivers, but remember keep in mind you have to use a router in order to use multiple devices in your home. I got the Motorola AC2600 4x4 WiFi Smart router. Installation of both devices was very easy. Literally, plug and play. However, you will most likely have to deal with your internet service provider in order to register your modem with their service and allow the modem to receive their signal. That was the most painful process. Everything else worked flawlessly. After buying and installing both the modem and router, I upgraded my Roku device to the Roku Ultra HD/4K streaming device with voice activated remote. I'm very pleased with the results I got. See my review for the Roku Ultra below: For about three years, I was using the same Roku device that was provided free with my Sling subscription. It was frustrating to watch a movie only for it to stop and start buffering. It was frustrating to try and watch YouTube content only to crash during the "loading" period or stop in the middle due to buffering issues. After researching and troubleshooting I came up with the following fixes that have resulted in awesome streaming, seamless channel surfing and no buffering once any channel is loaded (within 5 seconds or so). First, you need to run a speed test of your current internet. You should get results like 400mbps on a higher end laptop (i.e., Macbook Pro). If you get anything less, you need to up your internet service provider download speed. If you have multiple devices, I recommend at least 600mbps. Ideal would be 1000mbps. Next you need to make sure your modem can handle the speed. I got a Motorola MB8600 modem. This modem will handle speeds in the gigabit range. Hold on, that's not all. With this modem you need to get a router that can continue to support the new speed and the internet service that you are working with. I bought a Motorola AC2600 4x4 WiFi Smart router. This router will increase coverage to your home and will seamlessly support the internet speed and connectivity of the Motorola modem. All three of these devices compliment each other and will help you dramatically improve your video streaming ability. Please keep in mind that if your internet service isn't high enough, you will not get much of an increase in performance. You have to look at the entire system in your home. 1. The internet service that you are paying for monthly. This is critical. It has to be high enough (600-1000mbps). 2. A good Modem. Your modem is the device that takes the internet signal coming from your service (i.e., Xfinity, Verizon). I recommend you make sure your modem can handle speeds in the gigabit range. This should be good for about 3-5yrs. 3. A good compatible router. The router takes the signal from the modem and splits it so that multiple devices can use the internet signal coming into your home. Note- There are cable modems out there that are combination modem/routers. If you are on a budget they will work. However, I have found that my new combination of separate modem and router has improved my internet performance tremendously. Lastly, if you are on a budget and can't afford all the upgrades, then getting this Roku device will just be a waste of money. This Roku device is a high-end streaming device that will only perform at it's best if you have all the other devices in place that can provide the clean and fast internet signal it needs. I did a complete overhaul of my home system and can't be more pleased with the results. I replaced each component that I've described in stages just to see if each device really made a difference (a noticeable difference). I'm happy to report that each stage made a big difference.

WARNING: THIS IS A LONG REVIEW, BUT I MAY HAVE SOME ANGLES ON THIS OTHERS DON'T :-) Wow. I really like this modem. This is a barebones rock solid dead simple workhorse. It's got a plug for the cable and one ethernet (RJ-45) port out and I think an on/off switch. That's it. It makes a connection. And hasn't failed since I got it a month or so ago. All I had to do was call my ISP and give them the MAC address (on the sticker on the device) and they updated their tables and that was it. Turn it on. It goes through the startup cycle. Takes a few minutes to connect like they all do and that's it. Set it and forget it. What prompted me to get it, is I don't like having to rent the modem from the ISP @ $10.00/mo forever. This literally pays for itself in 16 months, and most people will have their Internet connection for many times that long, and time flies. So it's a good investment. It doesn't have phone connection like the ISP's modem did. So I called the company/provider that owns copper phone lines in the area and ordered landline service. I'm a nerd/techie and don't care what people say about landlines being for old fogeys, it's like having a backup generator ... I know I can use that landline if the power goes out or if the cell tower gets overwhelmed (too many calls or cell traffic at once), or there's radio interference in the area. Technically cable phone is a 'land line' (hardwired cable connection to provider) and the battery backup in the modem (which the ISP charges more for), could give you emergency phone service in an outage, but a cable phone connection can (and does) fail for more reasons than copper wire phone service does. (Those copper wire connections are called POTS - which stands for Plain Old Telephone Service), and copper wire phones are the most reliable. Having a separate modem from a router is optima for a few of reasons... Generally hybrid units of anything do everything okay, but nothing optimally (for example combination modem-router units like my ISP rents out). Better to keep the modem separate from the router. Then you can swap either out independently to upgrade as needed, disrupting less of your own network configuration doing so, and also help avoid a single point of failure. Plus, you might be able to score a router in a pinch on shorter notice than a cable modem if the router is the component that fails. Then you can choose the router you actually like, for whatever reason, and don't have to settle for whatever bundling du jour your ISP decides is right for you (even if it isn't). That gets me to the other point. What DID the ISP decide was right for me (but wasn't)? For awhile my ISP modem connection was dropping briefly in the middle of the morning. My computer came back up connected to the ISP's 'general public' wi-fi connection to their router which did not work for me and I'd have to keep manually switching back to my own internal Wi-Fi LAN (network). That was not only inconvenient but it forced me to investigate was was going on there. I learned my ISP gives lets passersby connect to their rental-modem's Wi-Fi signal, without giving me any way to disable that service! That really pissed me off to learn. The idea is that people driving around who have accounts with the provider can get internet access around the neighborhoods. If I was a passerby, that could really help me, so at first glance maybe 'why not, be a good samaritan'. But wait! There may be more too it than that. Besides the fact that I don't like it (for good reason), they give me no control over that 'feature'! And I see some downsides. What's good for the ISP isn't necessarily optimal for me. What I don't like about that 'service' is that one or more people could sit outside and suck down bandwidth (e.g. slow my connection down), unbeknownst to me. It also might cause the unit to use more energy and put out a stronger wi-fi signal than it needs to. Which health conscious people are well advised to be aware of. Wi-Fi is radiation. Not strong and may not ruin your life, but it is a stressor at a cellular level, this is known. And strong signals, persistent signals and people who are more sensitive or have immunity issues can be more vulnerable (headaches, sleep disruption, or worse). But I like Wi-Fi so I settle for whatever unknown health consequences I may not be aware of. Also it makes me wonder if a hacker might be able to use it as an additional point of access to my home network. I also wonder if it's 100% clear to law enforcement at first glance who might be visiting sites or doing something nefarious from the connection point. Might it look like the owner is doing something that a passerby did (and even if they can sort it out later, what if it takes awhile to figure out and they make a bad assumption?) Anyway, I don't have that problem with this modem and I'm just much happier with it all the way around. Plus it's blazingly fast.

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.

After reading about several issues with other DOCSIS 3.1 chipsets and determining that this one doesn't use that particular chipset, I decided to purchase this modem for my upgrade to gigabit internet (still on DOCSIS 3.0, but I wanted to be able to upgrade in the future). The modem worked amazingly for three weeks until it just kept crashing at random once every so many minutes or hours. The rep on the phone from my cable company wasn't even able to see the modem on his end despite it being up and me being able to browse the web on my end. Also, the web portal (at 192.168.100.1) was half impossible to access more than a few minutes after the modem had been up and running. After determining that it was likely just a faulty unit, I returned it for a replacement with the same model. It's been a little under a week now but the new unit is working great and better than the first one ever did. This certainly works, and it works well when it is working, but I can't help but dock a star for the first unit stopping working and me only happening to get very lucky with still being in the time frame to be able to replace it through Amazon. I will say that I am a bit confused about there being four ethernet ports on the back of this unit but a sticker covering three of them. Also the modem appears to not be able to quite deliver an entire gigabit of bandwidth, but I suppose the extremely small loss (relatively) is not a big deal for me or likely any other home user. Still, though, in addition to the need to warranty the first unit and these other strange quirks, I'm giving it four stars out of five. It's a modem, and it pretty much just works.

This is the best cable modem we have had out of 4 we have had. Solid performance, very easy install. Worked perfectly with Xfinity (which is notoriously picky). Used for about a year until Xfinity started pricing everyone out. Happy now with TMobile at $35/month, same 333mbps I was getting with $100/month Xfinity.

Motorola MB7600 series for 600 Mbps & MB8600 for 1 Gbps plan’s - - From AMZ : Last purchased Jun 24, 2022 ... Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port). The Motorola brand - used to be an electronics manufacturer who produced great Personal & Industrial Communication devices, that was most favorably trusted as a National vendor and good Customer Support; before delving into the the Internet marketplace. This review cover's two different Motorola modem model's, including two replacement's, within a short time of each other, in late 2021, and during many Months in 2022. ... In-between the past and after the 2022 Motorola fiasco - we had utilized the Arris SB cable modem series’s, starting from 200 to 400-Mbps Road Runner plan’s, to our latest 1-Gbps plan, with Spectrum. To-the-point, the Motorola’s modem’s were all Connectivity, Stability, Compatibility Total Failures, that cost us both Time and Money, being in the Real Estate Biz, lkie: 1..Unit(s) over-heating issue's, 2..Daily drop connection’s, 3..Re-booting issues, Our Internet / Wifi setup - a Spectrum cable modem with Wi-Fi + telephony, with the WiFi mode turned off, as we had our Airport Extreme's. We decided to upgrade modem's from an older Arris , keep the Spectrum modem for telephony purposes, and, add a new Moto MB 7600, which went dead after a black-out event. Then, decided to upgrade our Internet plan to 1-Gbps plan, also upgrade to the Moto MB8600 series, which worked well for about a week; then the fiasco ensued, as described above. Spectrum cable was very patient, and made about 6 to 7 on-site Tech support call's, and they checked everything on their side from street pole to building to the 2 modem's, and their modem was completely fine, and firing on all cylinders. They even Upgraded all of the Cable Run from Pole to Cable Interface Box on side of Building ... Straight to both Modem's. Their JOB was DONE. Decided to RE-install the older Arris SB modem, it fired up, All Lights Green, WiFi banging, and ran Smoothly, while getting 590+ Mbps, on our 1-Gbps plan; when we could barely get 200 to 300 Mbps on the Motorola; when it wasn't down! Called and emailed Motorola Tech Support - A complete waste-of-time, since their all-alone CS/Tech person (Quasimodo), despite forwarding copies of the Moto 8600’s modem’s Data Log’s, "It" turned out to be an arrogant, argumentative warehouse shop critter, and, of absolute no value. A phat ZERO Rating. For sale and/or give-away for Chai-naa'-made Junk parts - 2 Motorolla MB8611 model's, one DOA and the other is a "re-furbished" piece of *ecal debris. $1. DSM

I've been running an Arris SB6121 cable modem for about eight years now, but have been having some outages recently, in which the modem appeared to be at least partly responsible. In addition, the SB6121 is getting old and can support only four download channels, limiting its ability to use higher service speeds now available. My ISP advised that I upgrade, and given that my ISP is rolling out DOCSIS 3.1 starting in November, I decided it made sense to go with a DOCSIS 3.1 modem. Right now, that narrows the choice pretty much to three devices: the Netgear CM1000; the Arris SB8200; and this modem, the Motorola MB8600. The cable technician who just replaced my line advised against the Netgear due to having seen a lot of reliability issues with Netgear cable modems, but had no preference between the Arris and the Motorola. Since their specs are almost identical, but the SB6121 has had some firmware download issues and the Motorola is $30 cheaper than the Arris (and has a two-year warranty), I went with the Motorola. The Motorola, unlike most other cable modems, also has an actual physical power switch, so should you need to power-cycle it you can do so without unpligging it. Both this modem and the Arris have two gigabit-Ethernet ports. Yes, I know, you can only see one in the photos. And you'll only be able to see one when you take it out of the box. That's because the second port is hidden under the yellow adhesive film on the back panel. THERE IS A REASON FOR THIS. That second port is NOT for plugging in a second device, and you cannot use it for that purpose. Don't try. The second port is there so that if your router is capable of it, you can connect BOTH ports to your router and bond the two gigabit channels together into a single 2-gigabit channel. Your router must support this, your ISP must enable the second port,¹ and it's up to you to configure the router correctly for port bonding/trunking. Of course, this is only relevant if your ISP offers data rates over 1Gb/s *AND* your router can support that anyway. If you're a residential user it's unlikely that both of those are true. When you're switching to a new modem, you'll need to call your ISP and you'll need the MAC address from the sticker on the bottom of the modem. You will need to power your router off and wait for the modem to initialize fully the first time before you turn it back on. Expect that first-time initialization to take several minutes. Once the modem is online, bring your router back up and you should be good to go. AS SOON AS IT'S UP, point a web browser at 192.168.100.1, log in to the modem using the default password on the sticker on the bottom of the modem, click Advanced, click Security, and CHANGE THE ADMIN USERNAME AND PASSWORD. BOTH allow you to use only A-z and 0-9, which is a little weak. But you're allowed up to 15 characters. Use as many of them as you can to make your new password harder to guess — and no, don't use your dog's name, your phone number, or a dictionary word as a password. Make sure you record what you changed it to. Don't lose it. What do you get for your money? Well, in addition to DOCSIS 3.1 support, the MB8600 can bond up to 32 downstream and 3 upstream data channels. In my case, with no change in my service cost, my download bandwidth increased from about 46 megabits per second to about 96.5, and my upload speed from about 4.5 megabits per second to 11. Viewed from the perspective of what I was paying for what service tier, this modem will pay for itself in about a month and a half. With eight times as many download channels, it is also much more resistant to noise or other problems on any single channel. So far, the Motorola MB8600 earns a solid two Technical Technical Thug thumbs up. It is a substantial improvement over the Arris SB6121 it just replaced. ____ ¹ Well, OK, you *CAN* enable it yourself in the advanced configuration on the modem. But if you're messing with advanced configuration settings, you'd better know what you're doing. If you don't, you're on your own.

The Xfiniity compatible Modem was super easy to set-up following the Quick Start guide included in the box. Word of advice for Comcast / Xfinity subscribers -- when stepping through the set-up Wizard, selecting the option to text an activation code is a joke -- the code is only good for 15 minutes but I didn't receive the text until 30 minutes had passed; just stick with your Xfinity account name for the activation and provisioning. Xfinity upgraded to DOCSIS 3.1, and, while my own 6 year old trusty Motorola Surfboard SB6580 was working fine, Xfinity found every reason to pester me about an upgrade and how much I'm missing not having a 3.1 modem lease an upgrade. I prefer to own my own modem, so, after perusing compatible modems for my region on Xfinity's approved device page, I narrowed my choices to the ARRIS Surfboard SB8200, Netgear CM1000, and, this, the Motorola MB8600. All three are comparable at 1001 Mbps, 32 down x 8 up DOCSIS channels, and DOCSIS 3.1. All the cool kids love the Arris -- especially after they ditched the very problematic Intel PUMA chipset and went with the Broadcom's offering -- and for very good reasons, it has great hardware specs. Sporting 3GB of RAM, 128MB /16 of NAND flash memory it's a tasty treat. And, were it not a horrific white box that clashes with everything in my apartment, I'd happily have purchased it. Vanity, thy name be Monkey Rat, I know. I've never had a lot of love for Netgear, and, I found its hardware lacking -- 128 MB of flash memory and 256 MB of RAM. Ultimately not a huge game changer, with current theoretical home speeds at 1Gb, but one would expect something a tad more, well, more from a name like Netgear. While its feature rich -- which, is saying something for a cable modem -- I really saw no reason to down this path. That clashing white Arris was looking tastier at this point. Then I compared the MB8600 to both and found a happy place. 512 MB of RAM and 128 MB of NAN -- a buck cheaper than the Netgear with a doubling of the RAM, and while not as expensive -- marginally -- than the Arris, and certainly lacking a bit in the hardware department, but I paid more for future ability to bond upwards of 4 separate lines. However, the LACP technology requires a higher end router, and faster than a gig speed isn't necessarily right around the corner, but, this device positioned nicely for a future with a potential of 4Gb. Word of caution -- it's a BIG device. If you're familiar with the older Surfboards, this is easily double the size in height and does not come with any sort of mounting option. However, it has great ventilation thanks to a well aired grid pattern on the side. So, how does it work? My internet plan is the BLAST! 150 Mbps (stop laughing) -- and i assure you, I've never seen that even in the dead of night -- wired speeds show an increase on speedtest.net but it's not really all that noticeable, whether plugged in directly to the cable modem or my ASUS RT-AC86U router, notebook and desktop performance were negligible. However, wireless performance for my nVidia SHIELD K1 tablet and Google Pixel 2 phone were significantly improved - I found this a little odd as they're still going through a router, but, I can't argue with results. I keep forgetting the MB8600 has a baked in spectrum analyzer utility I need to check out -- I'll add an update when I do. Ultimately, I like it -- I play Everquest (the original) and noted better response times, but again, the MS aren't earth shaking or setting the sky afire. Stream the occasional movie, and really I don't have any complaints, and can only praise the device for its eye-popping Wi-Fi boost, for which I have no good explanation. I may change out my Cat5e for Cat6 and upgrade my router next -- hopefully wringing a couple more Mbps out. But, really, I think it's time to call xfinity and have to do some line tests. I will provide updates on that as well.