CM600-100NAS (24x8) DOCSIS 3.0 Cable Modem. Max Download speeds of 960Mbps. Certified for XFINITY by Comcast, Time Warner Cable, Cox, Charter & More (CM600)

High quality, does exactly what it claims to do. Quick, easy setup...it is super-fast, simple, and helps deliver on a whole-home experience! Ideal for streaming content and easily handles ISP plans up to 300 mbps. We paired it with a new Tenda WiFi router which is dual band, has a great interface (1 Gigabit ports and a USB for thumb-drive file sharing), the wireless data rates are high (300 mbps + 867 mbps) and the frequency per second is high. All of those mixed together combine for a recipe of speed and reliability, with no disruption throughout our home. As a buyer, I do take on the responsibility to read and cross-reference...I don't expect everything to be spoon-fed to me...especially on tech which is constantly changing to meet changing consumer needs for better, faster, reliable performance. Netgear did a good job laying out the critical performance-related details and product features...simple to read and follow. My husband left this purchase up to me (upgraded cable modem, separate from an upgraded WiFi router). I took the time to educate myself and learn because our cable, streaming, and internet needs are rigorous and high (especially since we WFH-Work-from-Home 100% of the time given the pandemic protocols, etc) and we have high standards for performance results given the work that we do and the tv entertainment and streaming that we do. I read the details of Netgear's product offering and guarantees (along with numerous other brands and models with various price-points), and I read hundreds of reviews. Then I leaned in on the best choice for our home. Ultimately though...as with all cable and internet-related products and services...you have to give it a test-drive with YOUR unique setup and circumstances for the usage and performance YOU need at YOUR home...including YOUR modem...it is absolutely critical to pair the cable modem with a compatible WiFi router that has the right high-speed, bandwidth, download speeds, etc...as you get better flexibility when the modem is separate from your WiFi router. Overall performance considerations: YOUR ISP home location, coverage and service speed...inside YOUR home with YOUR devices, with the type of whole-home coverage you need, and the number of devices you need connected simultaneously at any given time. For us, we paired the Netgear CM600 with a Tenda AC10U WiFi router...the connection is strong, consistent, super-fast and reliable for the 14 devices (TVs, computers, phones, printer, iPad, Kindle, bluetooths) that we have connected 24/7 right now. At times it will be more devices. It can have up to 30 devices connected at one time for super-fast speed. Along with a 4+ STAR rating, a great interface, and a 1 year warranty (wish it was longer, at least 2-3 Years), the price investment makes it an incredible "and-then-some" buy! I happened to order at the right supply-and-demand time...saved 46%, or $60 on the new Netgear modem (5 days later it went up 20%, although it is still priced at a 28% savings). I did notice it is no longer available to purchase directly on Netgear's website...don't know if that is indicative of it being discontinued. Either way, it is a solid piece of technology with great, high-quality performance. With the upgrade to our separate Modem/WiFi setup, it pays for itself on a break-even basis in less than 5 to 8 months and I save $168 to $300 each year by NOT renting the equipment (which is not as high-performing) from my ISP company. Great investment all around! I took the time to write a more detailed review...in hopes that it will help someone else like me trying to evaluate all of the critical details like I was "forced " to do. 😁

This new DOCSIS 3.0 modem by Netgear was just recently released. It has 24 downstream and 8 upstream channels for up to 960 Mbps of download speed, and a little over 200 Mbps of upload speed. I had just purchased an Arris SB6183 about 2 weeks earlier to upgrade my older Motorola SB6120 modem (Arris has since bought out the very reputable and reliable Motorola modem division). I had to do this to maximize my Blast internet speeds since receiving a free speed upgrade from Comcast. The Arris SB6183 is a very popular modem and probably the one most people buy. However, in my case, the Arris SB6183 kept randomly dropping my internet connection and rebooting. The connection would resume after each reboot in about a minute or two. When I contacted Arris about this I was told that Comcast's upload signal was causing the problem, even though Comcast had verified that all my signals were within THEIR specifications. Hence, the modem should not be rebooting. I can verify that Comcast was correct about my signal and power levels, as I have been with Comcast for well over a decade and constantly monitor the signals myself. Apparently, the Arris upload power level signal specifications for the SB6183 modem are just a little tighter than the upload signal Comcast can provide to my location according to Arris. Hence, their modem detects this and periodically drops my internet connection and reboots. This made no sense to me as the Arris modem is also Docsis 3.0 certified, and IS certtified to use with Comcast. I believed the problem lied with the Arris modem. I finally did return the Arris modem to Amazon and bought this new Netgear CM600 modem. After 2 days of use, no dropped connections, and no reboots! It appears the Arris SB6183 modem was the problem. Whether that was due to a defective modem, or the fact that it cannot tolerate normal Comcast signal fluctuations to my location does not matter. It did not work, and Arris was pointing the finger at Comcast's signals. I have had NO such issues with this new Netgear CM600 modem. In fact, this new Netgear modem has more Download and Upload Channels than the Arris modem since it was only recently released. The reason I mention this is that Arris also told me that in general, the more channels a modem has, the more finicky it is about the type of signal it receives. That is why my older Motorola SB6120 modem with fewer channels never experienced the dropped connection issue I was experiencing with the Arris SB6183. Yet, this new Netgear CM600 modem has been rock solid stable without a single dropped connection thus far, and has even more channels than the Arris SB6183 modem I just returned. Consequently, this appears to be an Arris design issue (they insisted the modem was operating normally), not a Comcast signal issue as Arris implied on the phone. Additionally, this new Netgear modem is also much more elegant looking, and matches the color of their routers which are also of high overall quality. I also have a Netgear Nighthawk R7000 router hooked into this modem. The indicator lights also look way much better on the CM600, and are of just the right brightness when compared to the Arris SB6183 modem. Another important feature is that the ethernet light BLINKS during data transmiision through the Netgear CM600 modem. For some odd reason, Arris removed the blinking property from the data tramsmisiion light on their SB6183. The light just stays on without blinking, giving no indication that data is actually being transmitted. In my book, this blinking helps to confirm a good interenet connection, even though Arris would say that the fact that their data transmission light "just stays on" without blinking also confirms that. The blinking feature adds a bit more icing to the Netgear modem feature set. I suspect this removal of the blinking property of the data transmission light applies to all current Arris modems. Older Motorola modems always had blinking data transmission lights. In fact, this is the first modem I have ever seen without one. The lights are also much more gawdy looking on the Arris SB6183. The Arris modem casing also has an unsophiscated bright white color, and also has a rather unremarkable bland square shape. It rather looks like a child's toy, not a piece of sophisticated hardware. The Arris modem also appears in general to have a cheaper look, design, and feel to it. The Netgear CM600 modem looks much more modern and elegant and has a power switch (Arris does not). It actually appears to have some thought behind its appearance and design. The bottom line here is that you should get this new Netgear CM600 modem. I have always used Mororola modems in the past, but that was Motorola, which is why I instinctively (without much thought) initially purchased the Arris SB6183. Arris sometimes likes to label their modems as Arris-Motorola rather than just Arris. They understand that Motorola's modem division enjoyed a very good history and reputation in the industry before being taken over by Arris. That was then, this is now. The jury on how Arris handles their acquisition of Motorola's highly regarded modem division is still out. However, given the experience and problems I have just had with the Arris SB6183 modem; its constant disconnects, its rather cheap look and feel, its lack of certain features, and the fact it could not handle the same signal Comcast has provided me for well over 10 years, I will be sticking with Netgear for now. This is the modem to get if you have Comcast, or one of the other certified ISP's for this modem. It really is that good, on all fronts, including appearance, performance, features, ergonomics, and design. Kudos to Netgear. UpDate 11/12/15: Still NO dropped connections and great performance. Can I give this modem 6 stars?!

Edit 12/13/17: So I got another one awhile back, forgot how long. But I guess I somehow got two defective units in a row before. This one performs flawlessly. No overheating, random reset or anything. It actually runs way cooler than the other two units. I have upped it to 5 stars. Original Review: I've only had this modem activated for a couple of days. So far, when the lights are all green and it is working, it's perfect. Fast speeds (even faster than what I'm paying for), stable connection, etc. The problem I seem to be having is that it will all of sudden just show the red power light on only. The manual indicates that it's overheating. Seriously? It was on for no more than 12 hours. The modem is standing upright in open air. It doesn't turn off with the power button either, have to unplug the power and plug it back in. It's done it twice so far in a less than 24 hour period. I have it reset to factory settings currently to see how it'll fair. But if it overheats again, I'm returning this. edit 3/14/16: So I got a new replacement. There is no longer an overheating issue as far as I could tell. The unit also runs a lot cooler than the defective one. I have had it installed for the last 3 days. It did, reset a couple of times on the second day, but have since stopped. I'm unsure if that happened due to TWC though. The logs suggest that at least 2 of the resets was because of them. But that day experienced a large number of resets for some reason. Seems perfect again, but will keep monitoring it. I have upgraded it to 4 stars. It would be 5 if it stays reset free. Like the original unit, when it works. It's great. Pretty much a set it and forget it deal. It's also great that the LEDs are not blindingly bright like ARRIS units. There are a ton of holes for venting. On the ARRIS modems, the holes are pretty much on one long side and the 2 short sides. The heat seems to be concentrated on the top half of the unit. I just wished that they could have made the modem so that you could have it laid horizontally.

This modem was a black Friday purchase. Before I start my quick list of credentials are: I work from home (so it gets a lot of use) and in IT security. With that said I was getting tired of Comcast throttling my speeds during certain hours of the day and night, so I purchased this modem to attempt to by pass them all together. I pay for 105 down and definitely wasn't getting that. Now my modem and router are on the 3rd floor and I work on the second floor. I know the router is one main cause of speed issues however 24 down is unacceptable in my eyes and when I ran the speed test next to the router it was only around 40ish. So enter my new Netgear modem. My new speed tests on the 3rd floor (next to the router is about 70 to 80 down and about 15 up. On the second floor where I work (just ran a speed test as I am writing this review / See pictures attached) I am getting 63.68 down and 10.26 up; which is a HUGE improvement from using the Comcast modem. Again my router is getting old and am looking to buy a new one soon, however the huge difference in speeds between this Netgear modem and the Comcast one are painstakingly clear. Oh and for you gamers that use a direct connection (I direct connect my Xbox one into LAN port 1) when I ran a speed test though the Xbox it showed 122 down (which is higher than I am paying for). I have to say that I do love it but there is a few concerns. Review notes below: Pros: -Very noticeable speed increase from Comcast Modem -Install went quickly. Called Comcast, gave them (if I remember correctly) the MAC and serial number on the modem and I was up and running within minutes. Cons: -My one and only major concern is how HOT it gets. I am not sure if this is normal for this modem and I still need to contact netgear about this. When I say hot; I don't mean warm to the touch, I mean borderline that I am worried the components are melting / fusing together on the inside. This is why I only give it 4 stars and not 5 Hope this review helped and I will try to answer any questions you all have.

I received an email from Comcast stating that my rented Ubee cable modem was no longer being supported. The only rental option they offered me was a cable modem with a wireless gateway and telephony support. Since I already have a Netgear R7000 Nighthawk wireless router and don't subscribe to their telephone service I opted to purchase my own to avoid the $10 a month cable modem rental fee. I first checked on Comcast's website for a list of retail cable modems that they support and this Netgear was one of them. As luck would have it, it was listed on a Lightning Deal so I bought it. It is rather large in size (about twice the size of my old Ubee), but still fits in the same location on my computer desk. It does feel warm to the touch on the top of the unit, but it's not burning hot. It's been rock solid for the seven days since I installed it. Speaking of install, it was not plug and plug. I had to call Comcast and give them the make, model, serial number, and MAC address of the modem so they could link it with my internet account (all of that info is listed on the outside of the retail box). And yes, I tried registering it online first and then with their special automated telephone number, but none of that worked. The first representative I called transfered me to someone else because they weren't able to register it. The second person was finally able to get the job done. It took 25 minutes on the phone, but finally it came to life! I'm using their "Performance" tier internet, which is 25 Mbps download and 5 Mbps upload. Speedtest.net shows around 29 Mbps down and 6 Mbps up, so it's right in range. As the photo I uploaded shows, it's bonded to 16 channels down (out of 24) and 3 channels up (out of 8). This is a great cable modem. I've been using a Netgear wireless router for nearly 2 years without issue, so hopefully this Netgear cable modem will be just as reliable. If you're still paying $10 a month to rent a Comcast cable modem, do yourself a favor and purchase your own!

I'm not a fifty year networking engineer, nor am I an expert in modem technologies. However, what I do know is when something works, and it works correctly. I don't have crazy high speed internet at my home because it isn't offered. I get by with 40mbps down and around 5 up. I love the channel bonding capabilities this modem has and it wasn't that much more than a more "normal" modem, so I decided to purchase it. Time Warner added the modem to my account within minutes. I was so pleased in the setup process and couldn't be any happier. I've done a few tests throughout the day and my speeds have stayed identical through out the day. That says a lot as I'm in a very congested area and often lose 20-30mbps at will. I also paired this modem with a NetGear Nighthawk R7000 and I am completely satisfied. The range is astounding and I was able to get rid of two network extenders. I've got 30 devices connected on my network at any given time and these two are performing flawlessly even in an open cabinet. I definitely recommend this modem! UPDATE! A week later: I have not ran into one single issue with my home internet. Adding even more devices is done so with ease and does not congest my network. My previous Time Warner supplied modem / router combo was terrible and I was constantly rebooting my modem and ran into a lot of interference. My speeds would also suffer drastically on a whim. I'm extremely satisfied with my purchase and the R7000 Nighthawk is also an extremely good router that won't break the bank. The CM600 and the R7000 combined have given me the Internet delivery I've been searching for. Both devices are in an open cabinet and perform flawlessly!

I am writing this review 7 months after purchasing this cable modem. I bought this NETGEAR CM600 cable modem to replace my Motorola SURFboard SB6141, because I needed a modem that could handle the highest speeds (Cox Ultimate) from my internet provider, Cox. This is exactly what I had hoped for. I love this modem! I have had it for close to 7 months now and it has been great! Speed: This modem is crazy fast and I love it! Reliability: I haven't had any connection issues with the modem itself. It is a high quality modem. Temperature: This modem stays cool all the time, which is surprising because it can handle incredibly more download and upload speeds than my old modem, which would get kind warm/hot to the touch. Size: My first impression was that this thing was bigger than I thought it would be because I was used to a smaller cable modem, but this one is as tall as my NETGEAR router. Lights: I love the fact that the lights on it are only bright enough to see them, and NOT bright enough to light up the whole room like the SB6141. It has been 7 months since buying this NETGEAR CM600 cable modem and I still have the same amazement and enthusiasm as I did about it when I first plugged it in and saw the 298 mbps download and 33 mbps upload speeds. A couple days ago, my friend was having issues with his SURFboard cable modem, and I told him about how amazing this cable modem is. He purchased this modem and now he gets even better speed than I do. I highly recommend this cable model to anyone who needs a future-proof cable modem that can handle 300+ mbps speeds.

I have no problem with the cable modem I received. It works fine, setup and registration with my cable internet provider was quick and painless. The modem works well with my plan level (budget asynchronous 5 up, 50 down budget plan). The signal levels are within the acceptable range and the modem does not get unusally hot. It does not have problems where it shuts down or resets. I (seems, I have not fully checked) to be completely compatible with my network. However, as the pictures I have included show, it is a refurbished product while the product description indicates you are purchasing a brand new item. I specifically looked for an affordable cable modem that was new as cable modems wear out. They have a transmitter/amplifier in them that can get old and have connection problems and they are exposed to external (to your house) cable lines that can receive surges and other line problems (like lightning strikes). I felt it was worth the price to buy a new modem, so I bought the least expensive one that was compatible with my service but specifically looked for one that was new. If I had known that this was a renewed/refurbished unit I would have selected a seller that listed it at a higher price (there were several buying options for the CM600, this was the cheapest "new" option). All in all, as I said, buyer beware!