Last Updated: November 24, 2018 (Refresh Now)
NETGEAR CM400 8x4 DOCSIS 3 0 Cable Modem Max download speeds of 340Mbps Certified for Xfinity from Comcast Spectrum Cox Cablevision more CM400 1AZNAS
Last Updated: November 24, 2018 (Refresh Now)
7.9
SCORE
/10
Total Reviews
1000
Old Reviews
0
Unverified
69
Spam Test
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Yes
WIFI
Review Analysis - 931 recent, verified reviews
Detailed Mode
ISP
274comcast, xfinity, router, mbps, internet
+81%
-19%
" ... Works for what I need. ... "
" ... The CM400 modem was easy to set up. ... My download speed went from 31 mbps with my old modem to 71 mbps. ... This modem will handle much higher speeds. ... "
" ... Bought this to replace my old modem that capped out at 50 Mbps. ... "
" ... Have had to reboot 2-3 times over that time but not sure if it's the modem fault, the router, or the ISP. ... "
" ... My ISP is WideOpenWest, and this is an approved modem. ... "
" ... I had An existing netgear router and replaced the arris modem from Comcast/xfinity with this one and set it up the same way. ... I went Online and activatEd it and downloaded the stoftware . ... "
" ... Includes my providers phone number for easy activation. ... "
" ... I am smoking what I was getting on my previous rental router. ... Yes you do have to call comcast and give them the MAC ID. ... "
Product Reliability
142working, month, modem, weeks, 6 months
+60%
-40%
" ... Working well for 1 year. ... "
" ... Had it almost 2 years with no problems. ... "
" ... works with optimum i am using on optimum with no issues ... "
" ... Product worked as advertised. ... "
" ... Easy to set up, working great so far, haven't had it but a few days. ... "
" ... Worked great for 2 weeks . ... "
" ... For this, it has been performing beautifully for about a year now. ... "
" ... No issues with this modem for over a year. ... "
Setup
131setup, modem, easy to install, install, set
+96%
-4%
" ... The CM400 modem was easy to set up. ... "
" ... Activation with Spectrum was painless. ... "
" ... To upgrade, simply install, and call WOW! ... "
" ... Easy to install. ... "
" ... Clear, simple instructions with pictures even a senior citizen can follow. ... Easy to install. ... Includes my providers phone number for easy activation. ... "
" ... Super easy activation (online with Comcast). ... "
" ... Activation was a breeze. ... "
" ... The easiest transaction ever,was received when you said it would be.thank-you easy set up so far works great!! ... "
Cables
86modem, company, renting, time warner cable, works great
+83%
-17%
" ... Working great without any issue with RCN Cable Connection. ... "
" ... This cable modem does its job, and it does it well. ... "
" ... Saving money versus renting the box from the cable company! ... "
" ... I liked this cable modem so much I bought one for my Mom for her house. ... It is faster than the Xfinity cable modem we have been renting for years. ... "
" ... Simply a Cable modem. ... "
" ... Works great and so much faster than my old cable modem ... "
" ... My cable company changed the minimum requirements needed for the Xfinity network and this works great. ... "
" ... Like all modems, it could use a longer cord so that you can hide it better, but I manage with a long extension cord that goes into my hiding place. ... "
Ease of Use
77easy to set, easy to install, set, setup, works great
+97%
-3%
" ... Easy to install. ... "
" ... Clear, simple instructions with pictures even a senior citizen can follow. ... Easy to install. ... Includes my providers phone number for easy activation. ... "
" ... Easy to set up, working great so far, haven't had it but a few days. ... "
" ... Set-up is easy and usually does not even require a call in - or at least it did not for me, and not having to call Comcast is like getting another life, so I support. ... "
" ... easy to install ... "
" ... Setup is easy. ... "
" ... It was that easy. ... "
" ... Easy to unpack, install and enjoy. ... "
Network
73wifi, modem, signal, netgear, internet
+74%
-26%
" ... If you are budget constraint and looking for separate Modem and Router. ... "
" ... I am smoking what I was getting on my previous rental router. ... Took me like 15 mins to set it up with my brand new router so I could ensure Wifi Signal all of the house house. ... "
" ... l experienced zero issues getting it connected to the Comcast Xfinity network. ... "
" ... I have paired this up with a nighthawk WiFi router and my internet in my house is so much better. ... "
" ... Still going strong in unison with my Netgear Nighthawk AC 1900. ... "
" ... When your neighbor steals your WiFi you want then to have the best signal possible, and this seems to do the trick. ... "
" ... It's so far is working great I have had no issues with connectivity. ... "
" ... Bought as a combo with the Nighthawk AC1750 router. ... "
Price
58money, worth, great modem, waste of money, paying
+81%
-19%
" ... Price was good, ease of connecting, speed not so fast though. ... "
" ... The price was good. ... "
" ... About paid for itself now! ... "
" ... Does its job well for the price. ... "
" ... Totally worth it. ... "
" ... Great modem for the price. ... "
" ... saving tons of money compared to leasing from optimum. ... "
" ... Great quality and price. ... "
Wifi
51wifi, modem, netgear, internet, wi fi
+71%
-29%
" ... I see the WiFi name ... "
" ... I am smoking what I was getting on my previous rental router. ... Took me like 15 mins to set it up with my brand new router so I could ensure Wifi Signal all of the house house. ... "
" ... The modem is connected to a Netgear Nighthawk AC 1750 router which I also recommend. ... "
" ... I have paired this up with a nighthawk WiFi router and my internet in my house is so much better. ... "
" ... However, I should have read fine print and got a modem that offers Wi-fi as well. ... If only there was an affordable cable modem with Wi-fi capabilities . ... "
" ... so possibly it was just the router. ... "
" ... Works great for my 100+ mbps internet! ... "
" ... I use wifi for a lot of things in the house including a smart tv. ... "
Marketplace
50product, advertised, works as advertised, thanks, seller
+74%
-26%
" ... Better than expected. ... "
" ... Great price and Amazon recommended. ... "
" ... Everything as expected. ... "
" ... I got the CM400 on Amazon for $40. ... "
" ... Works as advertised. ... "
" ... Hopefully this review wont jinx it! ... "
" ... had no issues,works as expected ... "
" ... The size is compact not as big as looks in the picture. ... "
Returns
44window, refund, item, returning, returned
+2%
-98%
" ... After more than a week had passed we still had no replacement. ... "
" ... It was not as expected, I returned it ... "
" ... Was used, would not work, it was registered under someone else and was unusable, I sent it back . ... "
" ... The first one I ordered didn't work and Amazon allowed me to return it for a new one. ... "
" ... I thought it was my service and by the time they came out and figured out it was the modem I missed the return window ... "
" ... I would return it but did not set up until a week ago and figured this out, now Amazon won't let me return it. ... "
" ... I have unfortunately missed the return window and will be stuck with a useless device. ... "
" ... disappointed, it did not have a phone jack, so I have to return it, ... "
Overall performance
42works, fast, job, speeds, fine
+95%
-5%
" ... I use this in conjunction with the Nighthawk 6700. ... "
" ... Works very well ... "
" ... It doesn't get hot and it works well. ... "
" ... this is my second one great product fast connection and speed. ... "
" ... No speed or connectivity issues so far. ... "
" ... Works just fine! ... "
" ... Just moved into a new home and have a lot of work for some classes and work stuff that needs to be done. ... "
" ... speed is super fast! ... "
Ports
39cable, router, ethernet, cable company, works great
+82%
-18%
" ... Simply a Cable modem. ... "
" ... Works great and so much faster than my old cable modem ... "
" ... Rates doubled over my DOCSIS 2.0 modem. ... "
" ... This is a solid cable modem. ... "
" ... The cable modem is working like a charm. ... "
" ... Definitely worth buying this and avoiding having to rent my cable company's modem. ... "
" ... The Cable Modem was not the problem. ... "
" ... Unplugged and plugged back in, and voila, internet. ... "
Device Compatibility
39devices, connected, internet, mac address, isp
+77%
-23%
" ... Yes you do have to call comcast and give them the MAC ID. ... "
" ... Helped to get me connected again. ... "
" ... It's so far is working great I have had no issues with connectivity. ... "
" ... Just call your provider with the mac id and you are up and surfing. ... "
" ... I have no problems with the device. ... "
" ... Paired with the Netgear Nighthawk 1750 I get up to 250mpbs consistently (with my faster devices anyway). ... "
" ... Had all 15 devices that connect converted over in less than an hour. ... "
" ... i haven't tested for internet speed yet but all my devices are connected and running properly. ... "
Delivery
32fast, delivery, works great, shipping, received
+88%
-13%
" ... For $40 (and same day delivery), I really can't complain about the CM400. ... "
" ... fast shipper, new product ... "
" ... Works as expected and it shipped quickly. ... "
" ... good product good shipping ... "
" ... Everything was as promised. ... "
" ... Delivered better than expected speeds. ... "
" ... I am very pleased and pleased with this product arrived fast and in good condition thank you ... "
" ... Arrived days early and works wonderfully! ... "
Product As Described
22works as advertised, expected, works as expected, works, exactly as described
+86%
-14%
" ... Better than expected. ... "
" ... Everything as expected. ... "
" ... Works as advertised. ... "
" ... had no issues,works as expected ... "
" ... The size is compact not as big as looks in the picture. ... "
" ... Works just as advertised. ... "
" ... Exactly as described. ... "
" ... Just as described. ... "
Internet
20speed, download, speeds, spectrum, runs
+85%
-15%
" ... We have 100 Mbps Internet service. ... "
" ... The download speed is at 58mbps, which is accurate to our current Internet plan, but the upload speed has been at 0.18mbps for the longest time, I'd have more speed if I actually went for a dial up plan instead. ... "
" ... Works great for my 100+ mbps internet! ... "
" ... Internet is pretty fast. ... "
" ... Its working good with 100M internet ... "
" ... My internet is faster now! ... "
" ... Works to date and has slightly improved internet speeds. ... "
" ... Excellent item for internet . ... "
Lagging
17reset, constantly, times, restart, needs
+29%
-71%
" ... Constantly have to reboot! ... "
" ... I shouldnt have to restart my internet 12 times a day. ... "
" ... Have to constantly restart. ... "
" ... Over and over, randomly. ... "
" ... This thing crashes CONSTANTLY and needs to be rebooted. ... "
" ... Every time it cuts out I have to unplug and replug it to get it to work ... "
" ... Happens several times a day. ... "
" ... Need to reset every day . ... "
Capacity
12sq ft, family, wifi, signal, router
+92%
-8%
" ... Took me like 15 mins to set it up with my brand new router so I could ensure Wifi Signal all of the house house. ... "
" ... great product for a 4-5 person household. ... "
" ... My home is about 1500 sq ft. ... "
" ... Works well for our family. ... "
" ... even in my 2000 sqft house . ... "
" ... My house is in 2nd floor and i get steong signal till the ground floor. ... "
" ... working good, covers my whole house ... "
" ... Used it in a 1950s 1500 sq ft ranch house and had great wifi inside and out wherever I went, now I'm in a two story larger townhouse and it was just as easy to switch everything over and set up again. ... "
Gaming
10streaming, gamer, video, playing, play
+100%
" ... I'm in a 2 gamer household. ... "
" ... We are not hardcore gamers or anything but it has been able to handle our regular streaming and such. ... "
" ... We have a 200 Mbps internet plan and play online games at the same time and it stays smooth for both of us. ... "
" ... But I hardwired my Xbox. ... "
" ... I recommend it for everyone except gamers and others who need more than the standard bandwidth. ... "
" ... You will be surfing in no time. ... "
" ... These speeds are more than enough to stream 4K video and for gaming. ... "
" ... Overall, I've had no issues streaming content or playing online games, and I've already recommended this product to friends and colleagues. ... "
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Specifications
Connectivity
WiFi: Yes
Recommendations
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