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
Condition: Used - Like New
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This item is eligible for return within 30 days of receipt
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 9 left in stock, order soon!
Arrives
Jun 1 – Jun 5
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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.
- Pairs with any WiFi router - Seamlessly compatible with any WiFi router to connect all your devices. This cable modem does NOT have a built-in wireless router or telephone call capability.
- 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.
- 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.
Brand: Motorola
Internet service provider: Comcast Xfinity, Cox Communications, Charter Spectrum, RCN
Connectivity Technology: Ethernet
Compatible Devices: Router
Product Dimensions: 7.25"L x 2.25"W x 7.88"H
Product Dimensions: 7.25 x 2.25 x 7.88 inches
Item Weight: 1.1 ounces
Item model number: MB8611
Date First Available: July 21, 2020
Manufacturer: MTRLC LLC
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jun 1 – Jun 5
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: 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
Size: compact DOCSIS 3.1 (2.5 Gbps Ethernet Port)
So unless you are granted the best Spectrum modem you are going to have issues with packet loss and will strangely need to replace the modem in 9 months to a year. Save yourself the aggravation and just get one of these. I had the 3.0 model for 7 years without an issue and now that Spectrum is going 3.1 I first got a free Spectrum modem proceeded by 2 swaps in a 2 month period. The issue was packet loss from time to time that would cause issues when I worked and gamed from home. So I was tired of free and purchased the Motorola 3.1 and not really shocked. My network has been stable ever since. Save yourself the troubles and just buy one of these already and be stress free. All you have to do is login to Spectrum's website. Get technical support, tell them the make, model and MAC of the unit and they will add the new MAC and delete the old MAC, give it about 15 minutes and you will be back online. Will take you 20 minutes from the 5 minute conversation with Spectrum to the Modem setting itself up. It's really that easy.
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Reviewed in the United States on May 13, 2025 by Tom D
Size: DOCSIS 3.0 (1 Gbps Ethernet Port)
This DOCSIS 3.0 modem is hard to beat! It features 24X8 channels, and supports a theoretical 900 MBPS. While that's a theoretical data transfer rating, you should still be able to get up to 650 MBPS with this modem, which is about as good as it gets with DOCSIS 3.0. Interestingly enough, I bought this modem to replace a DOCSIS 3.1 modem that quite working reliably with my ISP. After 5 trips to my house, and after eliminating every other possibility of causes for intermittent internet drops, my ISP tech finally brought over one of their DOCSIS 3.0 modems, which worked flawlessly. It seems someone in their networking department changed software settings. Regardless, this modem performs flawlessly with my ISP, consistently delivering 400 MBPS + download speeds without dropping service. It also does NOT have the Intel PUMA chipset, which has been known to cause problems. The size of the case is a little on the tall side, but not objectionably so in my application. It pairs up well with a TP-Link Deco XE75 mesh system to deliver consistent, reliable internet service. I highly recommend it!
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Reviewed in the United States on April 1, 2025 by David Lewis David Lewis
Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
This is a solid modem, and aside from the fact that there is no phone jack for VOIP, it's served its purpose. I would have given 5 stars if it had a phone jack. We got an alert over our TV that there was a shelter-in-place alert for our neighborhood that we missed because we just realized the phone has been disconnected since we got the new modem.
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Reviewed in the United States on March 18, 2025 by PittrPatt