Our Top Picks
Comcast customers who rent a gateway pay for it every month, which is why many eventually search for “best modem routers Comcast” and buy their own combo unit. The decision is narrower than it looks. You need a cable modem that your provider approves, fast enough for your internet plan, with a built-in router that covers your home. Pick a unit that is too slow and you throttle your own plan; pick one that is not approved and it may not activate at all.
This guide is for Xfinity subscribers who want to replace a rental box with a single modem and Wi-Fi router combo, whether for a small apartment or a busy family home. In 2026 the market still sells many refurbished and renewed units, so the six picks below mix DOCSIS 3.0 and DOCSIS 3.1 models. Each is judged only on facts in its title: DOCSIS version, Wi-Fi class, speed ceiling and approved providers. Nothing about real throughput is assumed.
Quick Picks
Motorola MT7711 (24X8) Cable Modem-Two Phone Ports Router, DOCSIS 3.0 Modem, AC1900 Dual Band Wi-Fi Gigabit Router for Comcast Xfinity - (Renewed)
One of the consumer electronics options compared in this guide.
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Motorola MG7550 Modem Wi-Fi Router Combo with Power Boost , Approved by Comcast Xfinity, Cox, Charter Spectrum-AC1900 Wi-Fi Speed(16x4 DOCSIS 3.0)-Renewed
One of the consumer electronics options compared in this guide.
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Arris (SBG8300-RB) - Cable Modem Router Combo - Fast DOCSIS 3.1 Gigabit & AC2350 WiFi,Comcast Xfinity, Cox, Spectrum & More, 1 Gbps Max Internet Speeds, 4 OFDM Channels - Renewed
One of the consumer electronics options compared in this guide.
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Motorola MG7700 Modem with Built in WiFi | Approved for Comcast Xfinity, Cox, Spectrum | for Plans Up to 800 Mbps | DOCSIS 3.0 + Gig WiFi Router (Renewed)
One of the consumer electronics options compared in this guide.
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Arris (G36-RB) - Cable Modem Router Combo - Fast DOCSIS 3.1 Multi-Gigabit WiFi 6 (AX3000), Approved for Comcast Xfinity, Cox, Spectrum & More, 1.2 Gbps Max Speeds - Renewed
One of the consumer electronics options compared in this guide.
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NETGEAR Cable Modem WiFi Router Combo C6220 - Compatible with All Cable Providers Including Xfinity by Comcast, Spectrum, Cox | for Cable Plans Up to 200 Mbps | AC1200 WiFi Speed | DOCSIS 3.0
One of the consumer electronics options compared in this guide.
View on Amazon| Product | Best for | Key spec from the title |
|---|---|---|
| Motorola MT7711 | Homes with a landline phone | 24×8 DOCSIS 3.0, two phone ports, AC1900 |
| Motorola MG7550 | Mid-speed plans, Wi-Fi coverage | 16×4 DOCSIS 3.0, Power Boost, AC1900 |
| Arris SBG8300 | Gigabit plans | DOCSIS 3.1, AC2350, 1 Gbps max |
| Motorola MG7700 | Plans up to 800 Mbps | DOCSIS 3.0, gig Wi-Fi router, up to 800 Mbps |
| Arris G36 | Newest Wi-Fi 6 option | DOCSIS 3.1, Wi-Fi 6 AX3000 |
| NETGEAR C6220 | Multi-provider compatibility | Works with Xfinity, Spectrum, Cox |
How to Choose
Match the DOCSIS version to your plan
DOCSIS 3.0 modems handle plans up to several hundred megabits, with the listed ceilings ranging up to 800 Mbps for the MG7700. DOCSIS 3.1 is built for gigabit plans and above. If your plan is near 1 Gbps, choose 3.1; if it is slower, a 3.0 unit can be enough. Always compare the maximum speed in the title with the tier you pay for. Leave some headroom, because wired and wireless speeds are always lower than the modem’s ceiling, and providers sometimes raise plan speeds without notice.
Check that your provider approves the model
Most titles name Comcast Xfinity as an approved provider. Confirm it with Xfinity’s compatible-device list before you buy, because approval can change over time. A modem on the list will activate smoothly, while one not on it may fail to connect or be removed later. Also consider whether you want voice-line support, which the MT7711’s phone ports offer. If you do not use a landline, ignore the phone-port count entirely, since it adds nothing for internet-only service and can nudge you toward an older design.
Wi-Fi class and coverage
AC1900 and AC2350 are Wi-Fi 5 classes that suit most apartments and mid-size homes. Wi-Fi 6, as in the G36 title, helps in crowded homes with many devices. Ignore the large class numbers as speed promises; they combine bands and are not what one device will see. For a large house, plan to add a mesh node or access point rather than relying on one box. Place the combo in a central, open spot instead of a closet, because walls and cabinets weaken the signal more than any spec on the box.
Renewed units and what to ignore
Several titles say Renewed or carry an RB suffix, which means a refurbished unit. These cost less but may carry shorter warranties and limited return windows. Ignore gaming-style marketing on a modem; it does not change speed. Budget combos usually cut corners on Wi-Fi range, Ethernet port count and firmware updates, so a separate router can be a better long-term choice.
The 6 Best Options
Motorola MT7711
A renewed cable modem with a 24×8 channel bonding spec, two phone ports, DOCSIS 3.0 and an AC1900 dual-band Wi-Fi gigabit router for Comcast Xfinity. It suits homes that use Xfinity voice service and want phone ports built into the same box. It is the only model in this list with phone support.
- Strength: two phone ports for voice service.
- Strength: 24×8 channels and AC1900 dual-band Wi-Fi.
- Trade-off: DOCSIS 3.0 and a renewed unit, so it may not suit gigabit plans or long warranties.
Skip it if you have no landline phone need or want a gigabit-class modem. Buyers who prefer a new unit with full warranty terms should check the return policy before buying a renewed one. It makes the most sense for a household that wants to stop renting a gateway but still relies on a home phone line, a combination that many newer modems no longer support at all, so the feature is a genuine differentiator here.
Motorola MG7550
A renewed modem and Wi-Fi router combo with Power Boost, approved by Comcast Xfinity, Cox and Charter Spectrum, with AC1900 Wi-Fi and a 16×4 DOCSIS 3.0 modem. It suits small to mid-size homes that want better signal strength from the built-in router. The Power Boost feature aims at wider coverage.
- Strength: Power Boost for extended wireless coverage.
- Strength: approved for several major cable providers.
- Trade-off: 16×4 channels and DOCSIS 3.0 limit it to mid-speed plans.
Skip it if you have a gigabit plan or a very large home. Renewed condition also means you should confirm the seller’s return terms. For a typical apartment or townhouse with a moderate plan and a handful of devices, though, it is a sensible one-box answer, and listing approval for three large providers helps if you ever move to a different cable company.
Arris SBG8300
A refurbished cable modem and router combo with DOCSIS 3.1, gigabit speeds and AC2350 Wi-Fi, listed for Comcast Xfinity, Cox, Spectrum and more with a 1 Gbps maximum. It suits households on gigabit-class plans who want the newer standard in a single box.
- Strength: DOCSIS 3.1 for gigabit-class plans.
- Strength: AC2350 Wi-Fi with wide provider support.
- Trade-off: 1 Gbps is the maximum, so faster plans will exceed it.
Skip it if your plan goes beyond 1 Gbps or you want Wi-Fi 6. Buyers who want a brand-new unit should look for non-refurbished options elsewhere. It is a natural fit for a household that streams in several rooms, works from home and games online, because DOCSIS 3.1 and a stronger Wi-Fi class give it more headroom than the older 3.0 combos in this list.
Motorola MG7700
A renewed modem with built-in Wi-Fi, approved for Comcast Xfinity, Cox and Spectrum for plans up to 800 Mbps, with DOCSIS 3.0 and a gigabit Wi-Fi router. It suits households with mid-to-high plans who prefer Motorola hardware. The 800 Mbps ceiling is stated plainly.
- Strength: a stated ceiling of 800 Mbps for plan matching.
- Strength: approved for multiple major cable providers.
- Trade-off: DOCSIS 3.0 means gigabit plans are out of reach.
Skip it if you may upgrade to a faster plan soon. A DOCSIS 3.1 unit would last longer for that scenario. It is a better fit for someone whose plan is already set around the mid-range and who values the certainty of a stated speed limit over a vague promise of future-proofing, since matching the ceiling to the plan avoids paying for unused capacity.
Arris G36
A refurbished cable modem and router combo with DOCSIS 3.1, multi-gigabit Wi-Fi 6 (AX3000), approved for Comcast Xfinity, Cox and Spectrum, with a 1.2 Gbps figure in the title. It suits buyers on faster plans with many connected devices. It is the most modern option here.
- Strength: Wi-Fi 6 for crowded homes.
- Strength: DOCSIS 3.1 for faster plans.
- Trade-off: it sits at the top of this group in cost and is refurbished.
Skip it if your plan is slow or you only have a few devices. Budget buyers can pick an older Wi-Fi 5 model instead. If your phones, laptops, consoles and smart-home gadgets all compete for the same network, Wi-Fi 6 is the feature most likely to be noticed, and it also leaves room for devices you add over the next few years.
NETGEAR C6220
A cable modem and Wi-Fi router combo compatible with all cable providers including Xfinity, Spectrum and Cox, for plans up to a speed that is cut off in the title. It suits renters who may move between providers. It carries a wide compatibility claim.
- Strength: compatibility with multiple providers.
- Strength: a recognizable networking brand.
- Trade-off: the exact speed ceiling and Wi-Fi class are not visible in the title.
Skip it if you need a clearly stated maximum speed. Check the full listing for the plan limit first. Since the title does not spell out the Wi-Fi class either, confirm both details before purchase and cross-check the model against your provider’s approved list, because a broad compatibility claim does not replace that confirmation step for your specific plan.
Which One Fits Your Situation
You have a gigabit plan
The Arris SBG8300 and Arris G36 both list DOCSIS 3.1. The G36 adds Wi-Fi 6 and a higher listed speed figure, which suits a busy household, while the SBG8300 covers a simpler gigabit setup with fewer devices.
You use Xfinity voice service
The Motorola MT7711 includes two phone ports, which makes it the one model here that can replace a rented gateway without losing the home phone line. Confirm voice activation with your provider first.
You have a mid-speed plan and want simplicity
The Motorola MG7700 lists a clear 800 Mbps ceiling, and the MG7550 adds Power Boost. Both are DOCSIS 3.0 and renewed, so keep the receipt and check your speeds soon after setup to make use of any return window. Run a wired speed check from a computer plugged straight into the unit, so Wi-Fi conditions do not hide a problem with the modem itself.
You may switch providers
The NETGEAR C6220 lists compatibility with Xfinity, Spectrum and Cox, so it follows you if you move to a place served by another cable company. Check the plan ceiling in the full listing before you rely on it.
Common Mistakes
- Buying a DOCSIS 3.0 modem for a gigabit plan.
- Skipping the provider’s compatible-device list.
- Assuming Wi-Fi class numbers equal real speed.
- Ignoring return policy on renewed units.
- Relying on one box to cover a very large house, then blaming the modem for weak signal in far bedrooms or forgetting to activate it with the provider.
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Frequently Asked Questions
Is buying my own modem worth it?
It can be, because you stop renting a gateway. Make sure the model is approved for your provider and plan. Add up how long you plan to stay with the same provider, since the savings build up over months rather than on day one.
What is DOCSIS 3.1?
It is the newer cable standard for faster plans. DOCSIS 3.0 handles slower tiers. If your provider upgrades your area, a 3.1 modem is more likely to stay useful, which is why many buyers choose it even for mid-speed plans.
Do I need a separate router?
Not always. A combo is simpler, but a separate router can give better Wi-Fi in large homes.
Are renewed modems safe to buy?
They can be, but warranties vary. Check the return window before you decide. A shorter warranty is the main trade-off for the lower tier, so keep the packaging and your purchase record in case you need to send the unit back within the first few weeks.
