Owning a Comcast Xfinity-supported modem eliminates rental fees ($14–$15/month, ~$180/year), ensures seamless compatibility with Xfinity’s network, and optimizes performance for plans ranging from 200 Mbps to 2 Gbps. Our top five picks—Motorola MB8611, ARRIS SURFboard S33, NETGEAR Nighthawk CM2000, ARRIS SURFboard SB8200, and Motorola MG8702 (modem/router combo)—feature DOCSIS 3.1, multi-gig speeds up to 2.5 Gbps, and easy activation via the Xfinity app or website. Key factors include compatibility with Xfinity plans, 32×8 channel bonding, and reliable performance for streaming, gaming, and smart homes. While Xfinity offers a free modem with select plans, third-party modems provide greater control, customization, and long-term savings.
Why Choose an Xfinity Supported Modem?
Also Read: Top 5 Best Comcast Approved Modem
Benefits of Comcast Xfinity Supported Modem
Xfinity-supported modems integrate seamlessly with Comcast’s cable network, supporting plans like Connect (200 Mbps), Fast (400 Mbps), Gigabit (1 Gbps), and Gigabit Extra (1.2 Gbps) with low latency (~10–15ms). Eliminating rental fees saves ~$180 annually, with most modems paying for themselves in 6–12 months. DOCSIS 3.1 ensures future-proofing, delivering high speeds for 4K/8K streaming on Netflix, gaming (e.g., Call of Duty), and remote work via Zoom. These modems handle 30–100+ devices, ideal for multi-user households with smart home devices like Ring doorbells.
Top 5 Best Comcast Xfinity Supported Modems
Below are five top Xfinity-supported modems, compared for speed, features, price, and compatibility with Xfinity plans.
1. Motorola MB8611 – Best Overall Xfinity Modem
- Ultra-fast DOCSIS 3.1 performance – Model MB8611 supports the fastest DOCSIS 3.1 cable modem services available for all …
- Compatibility – Plugs easily into any WiFi router for shared internet access by all your WiFi and ethernet-capable devic…
- Flexible connection: A 2.5G Ethernet port to work with even the Fastest Routers and Personal Computers, providing downst…
- Features: DOCSIS 3.1, 32×8 channel bonding, 1×2.5 Gbps Ethernet port, up to 2.5 Gbps, Active Queue Management (AQM), Xfinity Gigabit Extra compatible.
- Pros: High speeds (942 Mbps down/37 Mbps up on Gigabit plan), low latency (~12ms), surge protection.
- Cons: Single Ethernet port, requires separate router.
- Best For: Xfinity Gigabit (1 Gbps) or Gigabit Extra (1.2 Gbps) plans.
2. ARRIS SURFboard S33 – Best for Multi-Gig Plans
- Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savi…
- Modem Technology: DOCSIS 3.1 is the newest technology available from cable internet providers. Its 10x faster than DOCSI…
- Simple and Secure Set-up: Plug-in the device, download the SURFboard Central App, and follow the instructions to activat…
- Features: DOCSIS 3.1, 32×8 channel bonding, 1×2.5 Gbps + 1×1 Gbps Ethernet ports, up to 2.5 Gbps, Xfinity-approved.
- Pros: Fast (942 Mbps down/37 Mbps up), dual Ethernet ports for flexibility.
- Cons: May run warm, requires ventilation.
- Best For: Xfinity Gigabit Extra or Next Gen plans (1.2–2 Gbps).
3. NETGEAR Nighthawk CM2000 – Best for Premium Performance
- Compatible with major cable internet providers including Xfinity, Spectrum, Cox and more. NOT compatible with Verizon, A…
- Best for cable provider plans up to 2.5Gbps
- Works with any WiFi router. Connect any WiFi router to this modem’s Ethernet port to support all your wireless devices
- Features: DOCSIS 3.1, 32×8 channel bonding, 1×2.5 Gbps Ethernet port, up to 2.5 Gbps, Xfinity-approved.
- Pros: Reliable for 1–2 Gbps plans (940 Mbps down/35 Mbps up), premium build.
- Cons: Expensive, single Ethernet port.
- Best For: Xfinity Gigabit or higher plans with premium routers.
4. ARRIS SURFboard SB8200 – Best Value Xfinity Modem
- A Trusted Name in Home Connectivity: Better connectivity, better speed. The ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Mode…
- Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savi…
- Modem Technology: DOCSIS 3.1 is the newest technology available from cable internet providers. Its 10x faster than DOCSI…
- Features: DOCSIS 3.1, 32×8 channel bonding, 2×1 Gbps Ethernet ports, up to 2 Gbps, Xfinity-approved.
- Pros: Affordable, reliable for 1 Gbps plans (902 Mbps down/35 Mbps up).
- Cons: No 2.5 Gbps port, older model.
- Best For: Xfinity Fast (400 Mbps) or Gigabit (1 Gbps) plans on a budget.
5. Motorola MG8702 – Best Modem/Router Combo for Xfinity
- This Certified Refurbished Motorola MG8702, DOCSIS 3.1 Cable Modem Wi-Fi Router is tested and certified to look and work…
- Modem Router Combo Xfinity Ultra-fast DOCSIS 3.1 cable modem has 4 Giga Ethernet ports for wired connections. Active Que…
- Powerful 4×4 Wi-Fi 5 modem Docsis 3.1 Router – Power Boost, Range Boost, and AnyBeam Wi-Fi beamforming enable quality st…
- Features: DOCSIS 3.1, 32×8 channel bonding, 4×1 Gbps Ethernet ports, AC3200 WiFi 6 router, up to 2.5 Gbps, Xfinity-approved.
- Pros: All-in-one, WiFi 6 for ~1,500 sq ft, ideal for small homes.
- Cons: Limited WiFi range, pricier than standalone modems.
- Best For: Xfinity Connect (200 Mbps) or Gigabit plans in small homes.
How We Chose the Best Xfinity Supported Modems
Criteria for Selecting Top Comcast Xfinity Supported Modems
We evaluated modems based on:
- Compatibility: Verified on Xfinity’s approved device list, DOCSIS 3.1 for future-proofing.
- Speed: Supports 200 Mbps–2 Gbps plans, multi-gig capable (2–2.5 Gbps).
- Features: 32×8 channel bonding, AQM for low latency, 1–4 Ethernet ports, optional WiFi.
- Performance: Real-world speeds (e.g., 942 Mbps on Gigabit), reliability, and user feedback.
Insights from Xfinity’s approved modem list, PCMag, CNET, CableTV.com, Homeowner.com, and ApprovedModemList.com (2024–2025) informed our selections.
Comparison Table of Xfinity Supported Modems
| Model | Price | Speed | Ethernet Ports | Features | Best Use |
| Motorola MB8611 | ~$$$ | 2.5 Gbps | 1×2.5 Gbps | DOCSIS 3.1, AQM, 32×8 bonding | Gigabit/Gigabit Extra, gaming |
| ARRIS SURFboard S33 | ~$$$ | 2.5 Gbps | 1×2.5 Gbps, 1×1 Gbps | DOCSIS 3.1, 32×8 bonding | Gigabit Extra/Next Gen |
| NETGEAR CM2000 | ~$$$ | 2.5 Gbps | 1×2.5 Gbps | DOCSIS 3.1, 32×8 bonding | Gigabit, premium setups |
| ARRIS SURFboard SB8200 | ~$$$ | 2 Gbps | 2×1 Gbps | DOCSIS 3.1, 32×8 bonding | Fast/Gigabit, budget |
| Motorola MG8702 | ~$$$ | 2.5 Gbps | 4×1 Gbps | DOCSIS 3.1, WiFi 6, 32×8 bonding | Connect/Gigabit, small homes |
Benefits of Xfinity Supported Modems
Why Invest in a Comcast Xfinity Supported Modem?
Owning an Xfinity-supported modem saves $180/year, enhances speeds (e.g., 942 Mbps on Gigabit plan), and ensures compatibility with Comcast’s network. DOCSIS 3.1 delivers 10x faster performance than DOCSIS 3.0, supporting 4K/8K streaming, gaming, and future Xfinity upgrades with low latency (10–15ms). These modems handle 30–100+ devices and are portable, compatible with other ISPs (e.g., Spectrum, Cox) if you switch providers.
Customer Reviews and Feedback
What Xfinity Users Say About Supported Modems
- Motorola MB8611: Amazon (4.5/5, 2,000+ reviews) praises speed, reliability; separate router needed (Xfinity forums).
- ARRIS S33: Best Buy (4.3/5) highlights performance, some note overheating in warm climates.
- NETGEAR CM2000: Amazon (4.2/5) lauds premium speeds, high cost criticized.
- ARRIS SB8200: Affordable, reliable for 1 Gbps (4.4/5, Amazon).
- Motorola MG8702: Convenient combo, WiFi range limits noted (4.1/5, Best Buy).
Concerns include activation challenges, router pairing needs, and voice service compatibility (requires eMTA for Xfinity Voice).
Tips for Setting Up and Using Your Xfinity Supported Modem
Maximize Your Comcast Xfinity Supported Modem Performance
- Setup: Connect modem to cable outlet, activate via Xfinity app or xfinity.com/activate (use MAC ID), call 1-800-XFINITY if needed, pair with WiFi 6 router (e.g., ASUS RT-AX86U Pro).
- Placement: Position in open, elevated area (~3–5 ft), ensure ventilation to prevent overheating.
- Testing: Verify speeds with Speedtest.net (aim for 80–90% of plan, e.g., ~900 Mbps on Gigabit).
- Maintenance: Update firmware via modem’s IP (e.g., 192.168.100.1), avoid Puma chipset modems (e.g., ARRIS SB6190), check Xfinity’s approved list for updates.
Conclusion
Choose the Best Comcast Xfinity Supported Modem for Your Plan
The best Comcast Xfinity supported modems for 2025 address diverse needs: Motorola MB8611 for top performance, ARRIS S33 for multi-gig speeds, NETGEAR CM2000 for premium setups, ARRIS SB8200 for value, and Motorola MG8702 for an all-in-one solution. Match your modem to your Xfinity plan: 200–400 Mbps for budget needs or 800–1200 Mbps for high-speed households. Shop now on Amazon or Best Buy to save on rental fees and boost your internet in 2025!