The best DOCSIS 3.1 modem for most people in 2026 is the Arris SURFboard S34. It supports multi-gig download speeds, has a 2.5 Gigabit Ethernet port, and works with the faster upload tiers Xfinity, Cox, and Spectrum are rolling out. If you want to spend less, the Hitron CODA56 delivers most of the same performance for a lower price, and the Arris SB8200 remains a solid budget pick for standard gigabit plans.
Key Takeaways
- A DOCSIS 3.1 modem is now the minimum standard for cable internet. ISPs like Xfinity are retiring DOCSIS 3.0 equipment, and owning your own modem eliminates rental fees of $10 to $15 per month.
- If your plan is 1 Gbps or faster, choose a modem with a 2.5 Gigabit Ethernet port. A standard 1 Gigabit port caps real-world speeds around 940 Mbps, below what you are paying for.
- If your ISP advertises "Next-Gen" or enhanced upload speeds, pick a mid-split capable modem like the Arris S34, Netgear CM3000, or Hitron CODA56 to unlock faster uploads.
Why DOCSIS 3.1 Is Still the Right Choice in 2026
DOCSIS 3.1 is the technology standard that lets a cable modem communicate with your internet provider. It supports download speeds up to 10 Gbps in theory, and 1 to 2.5 Gbps on real home plans. DOCSIS 4.0 modems exist, but they are expensive and most US cable networks are not yet built to take advantage of them. For nearly every household on Xfinity, Spectrum, Cox, Optimum, or Mediacom, a good DOCSIS 3.1 modem is the sweet spot: full speed today, plenty of headroom for tomorrow, and no monthly rental fee.
Before buying any modem, confirm compatibility with your internet provider and your specific speed tier. None of the standalone modems below work with fiber, DSL, or satellite service, and most do not support bundled voice plans.
The Best DOCSIS 3.1 Modems of 2026
1. Arris SURFboard S34: Best Overall
The Arris SURFboard S34 is the top pick for 2026. It handles plans up to 2.5 Gbps, includes both a 2.5 Gigabit and a 1 Gigabit Ethernet port, and supports mid-split technology, which unlocks the faster upload tiers on plans like Xfinity Next-Gen. It runs on a stable Broadcom chipset, sets up in minutes with the SURFboard Central app, and is certified for Xfinity, Cox, and Spectrum. If you want one modem that covers every current cable plan, this is it.
2. Arris SURFboard S33: Best Runner-Up
The Arris SURFboard S33 is nearly identical to the S34 but without the enhanced upload support, which makes it a smart buy if your area has not received Next-Gen upload upgrades. It offers the same 2.5 Gigabit port and stable Broadcom chipset, often at a lower price. Its consistently low latency also makes it a favorite among competitive players; see our guide to the best DOCSIS 3.1 modems for gaming for that full breakdown.
3. Netgear Nighthawk CM3000: Best for Fast Uploads
The Netgear Nighthawk CM3000 is built for households that upload as much as they download: content creators, remote workers on constant video calls, and anyone backing up large files to the cloud. It supports both mid-split and high-split configurations, handles download plans up to 2.5 Gbps, and includes a 2.5 Gigabit port. It costs more than most modems here, but nothing on this list is better prepared for the upload upgrades Xfinity and Cox are rolling out.
4. Hitron CODA56: Best Value
The Hitron CODA56 gives you a 2.5 Gigabit port and mid-split capability at a price that undercuts the bigger brands. It supports plans up to about 2.3 Gbps and is certified for Xfinity, Spectrum, and Cox. It skips the extras, but for anyone on a gigabit plan who wants the most performance per dollar, this is the smartest buy of 2026.
5. Motorola MB8611: Best Low-Latency Alternative
The Motorola MB8611 pairs a 2.5 Gigabit Ethernet port with Active Queue Management, a feature that keeps latency low during gaming, streaming, and video calls. It supports downloads just under 2.5 Gbps and uploads up to 800 Mbps where supported, and it is approved for Xfinity, Cox, and Spectrum. A dependable pick backed by a strong warranty and US-based support.
6. Netgear Nighthawk CM2500: Best for Xfinity Upload Tiers
The Netgear Nighthawk CM2500 is a mid/high-split modem designed around the newer upload-focused plans, including Xfinity tiers with 100 Mbps uploads. It reaches 2 Gbps downloads by combining its two 1 Gigabit ports through link aggregation, so pair it with a router that supports that feature to get full speed. Not compatible with Xfinity Voice plans.
7. Arris SURFboard SB8200: Best Budget Pick for Gigabit Plans
The Arris SURFboard SB8200 is the classic DOCSIS 3.1 modem, widely deployed, extremely stable, and compatible with every major cable ISP. It has two 1 Gigabit ports and no multi-gig or mid-split support, which makes it the right choice for standard plans from 300 to 1,000 Mbps where you simply want reliability at the lowest cost.
8. Motorola MB8600: Budget Classic
The Motorola MB8600 is another proven budget option for gigabit-and-under plans. It uses a secure Broadcom chipset, supports Active Queue Management for lower latency, and works with Xfinity, Cox, and other major providers. If you see it priced below the SB8200, grab it.
9. Arris SURFboard G34: Best Modem-Router Combo
Want one box instead of two? The Arris SURFboard G34 combines a DOCSIS 3.1 modem with a Wi-Fi 6 router, delivering wireless speeds up to 3 Gbps and support for cable plans up to 1 Gbps. It is compatible with Xfinity, Cox, and Spectrum, and setup takes minutes through the SURFboard Central app. A combo unit means fewer cables, one power outlet, and one device to manage.
Comparison Table: Best DOCSIS 3.1 Modems of 2026
| Model | Best For | Max Plan Speed | 2.5G Port | Faster Uploads |
|---|---|---|---|---|
| Arris S34 | Overall | 2.5 Gbps | Yes | Yes (mid-split) |
| Arris S33 | Runner-up | 2.5 Gbps | Yes | No |
| Netgear CM3000 | Heavy uploads | 2.5 Gbps | Yes | Yes (mid/high-split) |
| Hitron CODA56 | Value | 2.3 Gbps | Yes | Yes (mid-split) |
| Motorola MB8611 | Low latency | 2.5 Gbps | Yes | No |
| Netgear CM2500 | Xfinity upload tiers | 2 Gbps (link aggregation) | No (2x 1G) | Yes (mid/high-split) |
| Arris SB8200 | Budget gigabit | 1 Gbps | No | No |
| Motorola MB8600 | Budget classic | 1 Gbps | No | No |
| Arris G34 | Modem-router combo | 1 Gbps | No | No |
How to Choose a DOCSIS 3.1 Modem
Match the modem to your plan speed
Buying a multi-gig modem for a 300 Mbps plan wastes money, and buying a gigabit modem for a 2 Gbps plan wastes speed. Check your bill for your plan tier, then pick the cheapest modem on this list that comfortably covers it.
Check for a 2.5 Gigabit Ethernet port
Gigabit plans are often over-provisioned, meaning your real speed can exceed 1,000 Mbps. A standard 1 Gigabit port caps you around 940 Mbps in practice. If your plan is 1 Gbps or faster, a 2.5 Gigabit port ensures you receive everything you pay for.
Look for mid-split support if your ISP offers faster uploads
Cable uploads were stuck around 35 Mbps for years. Mid-split and high-split technology raises that to 100 Mbps or more where ISPs have upgraded their networks. If your provider advertises enhanced or Next-Gen upload speeds, choose the S34, CM3000, CM2500, or CODA56.
Remember these are modems, not routers
Except for the G34 combo, every modem on this list needs a separate Wi-Fi router to create a wireless network. If you already own a good router, a standalone modem is the better setup. Browse our wireless router collection to pair one up.
Frequently Asked Questions
Is DOCSIS 3.1 obsolete in 2026?
No. DOCSIS 3.1 remains the standard for US cable internet in 2026. DOCSIS 4.0 modems are available, but most cable networks are still optimized for 3.1, and a quality DOCSIS 3.1 modem will stay relevant for years.
What is the difference between DOCSIS 3.0 and DOCSIS 3.1?
DOCSIS 3.1 is roughly ten times faster than DOCSIS 3.0, with lower latency and better efficiency. Many ISPs, including Xfinity, are actively retiring DOCSIS 3.0 modems from their networks, so 3.1 is the minimum standard for any new purchase.
Which DOCSIS 3.1 modem is best for Xfinity?
The Arris SURFboard S34 is the best DOCSIS 3.1 modem for Xfinity in 2026 because it supports Next-Gen upload tiers. For standard Xfinity gigabit plans, the Arris S33 or Hitron CODA56 also work well. Browse all Xfinity compatible modems here.
Do I still need a router with a DOCSIS 3.1 modem?
Yes, unless you buy a combo unit like the Arris G34. A modem connects your home to your ISP, and a router creates the Wi-Fi network your devices use. Standalone modems have no Wi-Fi built in.
How much money does buying your own modem save?
Most cable providers charge $10 to $15 per month to rent a gateway, or $120 to $180 per year. A modem you own typically pays for itself in under a year and keeps saving after that.
What is a mid-split modem?
A mid-split modem dedicates more of the cable frequency spectrum to uploads, raising upload speeds from around 35 Mbps to 100 to 200 Mbps on supported networks. High-split goes further, up to 1 Gbps in some areas. You only benefit if your ISP has upgraded your neighborhood.
Do these modems work with fiber internet?
No. Cable modems only work with coaxial cable providers like Xfinity, Spectrum, Cox, and Optimum. Fiber providers such as AT&T Fiber and Verizon Fios use an ONT instead of a modem.
