Best Cable Modems in 2026

A cable modem is the rare piece of networking gear with a payback date you can circle on a calendar. Xfinity charges $15 a month for its gateway, which is $180 a year, so a $129 modem pays for itself in under nine months and then keeps paying.

But the math changed this month, and not everyone should buy one now. Cox finished folding into Spectrum on September 16, and Spectrum plans include a modem at no charge. If you're on that side of the merger, buying hardware saves you nothing. Read the section below on which ISPs make this worth doing before you spend anything.

Quick Picks

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Motorola B12 DOCSIS 3.1 Cable Modem

Motorola positions the B12 as the successor to the MB8611, and on paper it is the same modem in a smaller box: DOCSIS 3.1, 32x8 channel bonding, one 2.5 Gbps Ethernet port, downstream up to 2,500 Mbps and upstream up to 800 Mbps on plans that support it.

The reason it leads this guide is price discipline. Motorola lists the B12 at $199.99. It sits at $129.00 on Amazon, and Best Buy carries the same B12-30-10 SKU, so this is a real discount rather than one seller's fantasy. Against Xfinity's $15 monthly gateway fee that is a payback period of eight and a half months.

It has close to 30,000 ratings at a 4.3 average, and the theme in them is boring in the best way. People plug it in, run the activation flow, and it works. For a device whose entire job is to disappear behind the TV stand, boring is the correct review.

The compact case matters more than it sounds. At roughly 3.5 by 3.5 by 5.5 inches it stands upright in a media cabinet where the taller Nighthawk will not.

Best for: almost everyone on a plan up to 1 Gbps who already owns a router they like.

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Hitron CODA56 DOCSIS 3.1 Cable Modem

Hitron is the company that builds a lot of the gateways your ISP hands you, which is why the CODA56 reads like ISP hardware sold retail. That is a compliment. The upstream spec is the part worth noting: 2 OFDMA channels, not just OFDM downstream, which is what actually helps on the plans that have started selling faster uploads.

At $159.99 it matches both Hitron's own store price and the current tracked price history, so nothing odd is happening on this listing. Average tracked price sits near $149 and the ceiling has been around $209, which puts today squarely in normal territory.

The catch is warranty. One year on this listing against three for a lot of the field. Hitron does sell a separate three-year-warranty version of the same modem if that trade matters to you, which is an unusual way to package it.

Best for: buyers on the smaller regional cable ISPs, where the certification list is the whole ballgame.

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NETGEAR Nighthawk CM2000 Multi-Gig Cable Modem

Here's the honest version: the CM2000 does not do anything the $129 Motorola cannot. Both top out at 2.5 Gbps, both run one 2.5 GbE port, both are 32x8 DOCSIS 3.1.

What you're paying for is NETGEAR's support tail. Nighthawk modems get firmware attention for years after launch, and on a device that has to stay certified against an ISP's provisioning system, that is not nothing. If your cable plant is noisy and you expect to be calling support, the odds are better here.

The price checks out. Walmart lists it at $299.99 too, and Dell has it at $376.99, so the Amazon number is at the low end of the field rather than the high end.

Buy it if you want the long support tail and you've got the shelf space. Otherwise the B12 does the same job for $170 less.

Best for: multi-gig plans where the modem needs to outlast three router upgrades.

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ARRIS SURFboard G54 DOCSIS 3.1 Modem and Wi-Fi 7 Router

Most of this guide argues for separating the modem from the router, because you replace routers far more often than modems. The G54 is the exception worth listing, for one specific buyer: someone renting a $15 gateway who also needs a new router and does not want two boxes.

Spec-wise it is the only pick that reaches past 2.5 Gbps. DOCSIS 3.1 on the cable side with a 10 GbE port and four gigabit ports behind it, quad-band BE18000 Wi-Fi 7 on the wireless side. If you've been waiting for a Wi-Fi 7 upgrade anyway, the router half alone is worth a few hundred dollars.

The tradeoff is the one every combo unit has. Wi-Fi standards move every few years, DOCSIS moves every decade, and when Wi-Fi 8 hardware lands you'll be throwing away a perfectly good modem to get it. Well, sort of. You can always bridge it and hang a new router off the back, which is what most people end up doing.

A note on the price: street on this has been near $600, Best Buy has it at $449.99 as a clearance number, and $439.99 on Amazon is under both. That's a genuine low, not a seller getting creative.

Best for: an Xfinity or Astound subscriber replacing the rented gateway and an aging router in one purchase. If you only need the router half, our Wi-Fi 7 router guide covers that separately.

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What We Left Out, and Why

Two modems that belong in every other guide are not carded here, and the reason is pricing rather than hardware.

The Motorola MB8611 is the default recommendation across most of the internet and it deserves to be. Its Amazon listing sat at $310.99 at the time of writing, against a street price that has lived near $150 for years. That is a marketplace repricing, not a market price, and a $310 MB8611 is a worse buy than a $129 B12 that is functionally the same modem. Check it again in a month.

The ARRIS SURFboard S33 has the same problem in a milder form. ARRIS launched it at a $179.99 list, Best Buy sells it at $199.00, and the Amazon listing carrying a price showed $219.00. Above list is not a recommendation. The S33 is a good modem and it is the safer pick for Spectrum accounts specifically, so it's worth watching, just not at that number.

How to Buy One Without Wasting Money

Check whether your ISP even charges you

This is the step people skip. Spectrum plans include a modem at no charge, and after Cox completed its transition to Spectrum on September 16 that now covers former Cox subscribers too. Buying hardware to replace a free modem saves you exactly nothing.

Xfinity is the opposite case. $15 a month for the gateway, $25 if you're on xFi Complete, and it never stops. That's where a $129 modem turns into $180 a year saved.

Match the modem to the plan, not to the marketing

A 2.5 Gbps modem on a 500 Mbps plan buys you nothing today. It buys you headroom, which is a real thing on a device you'll own for six years, but it is not speed.

The number that matters is channel bonding. 32x8 DOCSIS 3.1 is the floor for any plan at or above gigabit. Every modem in this guide clears it.

Confirm the ISP's approved list before you order

Every cable ISP publishes a list of modems it will provision, and the lists are not identical. Spectrum has removed the MB8611 from its current approved device list, so existing units may keep working while new activations are not guaranteed. That single detail changes the right answer for a Spectrum customer.

Look the model up on your provider's list the same day you order. It takes two minutes and it is the difference between a ten-minute activation and a support call.

Decide separate boxes or one box before you shop

A standalone modem plus your own router is the flexible path. You upgrade the Wi-Fi when Wi-Fi moves and leave the modem alone for years.

A gateway like the G54 is fewer cables, one power brick, one support number. It also means one failure takes out both halves. Pick a side first, then pick a product, because shopping across both categories at once is how people end up buying twice.

Do not buy DOCSIS 4.0 yet

You will see DOCSIS 4.0 in marketing copy. Retail DOCSIS 4.0 modems are not meaningfully available yet, and no residential ISP is provisioning them at scale. Everything in this guide is DOCSIS 3.1, including the G54, which is the correct standard to buy in 2026.

Frequently asked questions

How long does it take for a bought modem to pay for itself?

On Xfinity's $15 a month gateway fee, a $129 Motorola B12 breaks even in 8.6 months and saves $180 a year after that. A $299.99 CM2000 takes 20 months. On Spectrum, which includes a modem at no charge, it never pays for itself, which is why the ISP check comes before the product choice.

Do I still need a router if I buy a modem?

Yes, for three of the four picks here. The Motorola B12, Hitron CODA56 and NETGEAR CM2000 are modems only, with no Wi-Fi. The ARRIS SURFboard G54 is the exception: it is a modem and a Wi-Fi 7 router in one chassis.

Will a 2.5 Gbps modem make my 500 Mbps plan faster?

No. A modem cannot exceed what the ISP provisions. The value of a 2.5 Gbps port is headroom for a future plan upgrade on a device you will likely own for five or six years, not speed you get today.

What happened with Cox and Spectrum?

Cox completed its transition to Spectrum on September 16, 2026. Service continues unchanged for existing customers, but Spectrum plans include a modem at no charge, where Cox had been charging roughly $14 a month for equipment. Former Cox subscribers should confirm their current bill before buying hardware.

Is DOCSIS 3.1 still the right standard to buy?

Yes. DOCSIS 4.0 exists as a specification but retail modems are not meaningfully available and residential provisioning has not arrived. A 32x8 DOCSIS 3.1 modem with OFDM and OFDMA channels is the current buy and will stay serviceable for years.

Why is the Motorola MB8611 not recommended here?

Only because of its price on the day this was written. The listing showed $310.99 against a street price that has sat near $150 for years, which is marketplace repricing rather than a market price. The hardware is fine. The Motorola B12 is effectively the same modem at $129.

Bottom Line

Buy the Motorola B12 at $129 unless you have a specific reason not to. It clears the same 32x8 DOCSIS 3.1 bar as modems costing twice as much, it fits where the taller units do not, and against Xfinity's gateway fee it pays for itself before the next football season ends. Step up to the Hitron CODA56 if you're on a regional ISP whose approved list is short, to the NETGEAR CM2000 if you want the longest firmware support tail, and to the ARRIS SURFboard G54 only if you're replacing a router in the same purchase.

And check your bill first. If you're on Spectrum, including the Cox accounts that moved over this month, the modem is already free and the best cable modem for you is the one you already have.