The Best DOCSIS 3.1 Modems of 2026
In 2026, internet service providers (ISPs) like Xfinity, Spectrum, and Cox have shifted their focus from just "Download Speed" to symmetrical performance. While DOCSIS 4.0 modems are entering the market, they remain expensive and overkill for most homes. For the majority of people, a high-end DOCSIS 3.1 modem is still the sweet spot—especially if you choose a model with a 2.5GbE port and the right split support for faster uploads.
Compatibility Disclaimer: Please confirm compatibility with your internet service provider before purchasing to ensure it will work in your area and with your service plan.
What's Inside
Arris SURFboard S33
The Arris S33 remains our gold-standard recommendation for 2026. It’s a dedicated cable modem (no built-in Wi-Fi) designed for users who want the lowest possible latency, clean stability, and multi-gig headroom without paying DOCSIS 4.0 prices.
- Compact footprint
- Broadcom-based stability (great for gaming)
- 2.5GbE port prevents speed caps
- No voice/telephony support
- Can run warm under sustained load
Netgear Nighthawk CM3000
If your ISP (especially Xfinity or Cox) has upgraded your neighborhood to faster upstream tiers, you need a modem that can keep up. The CM3000 is one of the strongest DOCSIS 3.1 picks that’s built for Mid-Split / High-Split rollout scenarios—meaning dramatically better upload performance where supported.
- Much faster uploads on supported plans
- Great fit for “Enhanced / Next-Gen” cable tiers
- Strong performance for heavy upstream use
- Higher price point
- Larger vertical design
Hitron CODA56
The Hitron CODA56 is one of the smartest value buys in 2026: you get a 2.5GbE port plus Mid-Split capability at a price that often undercuts bigger brands. For many households on gigabit tiers, this is the best “upgrade per dollar.”
- 2.5GbE port at a value price
- Mid-Split-ready for many ISP rollouts
- Excellent match for modern gigabit plans
- Fewer “extra” features than premium models
- Availability can vary depending on supply
Arris SB8200
The Arris SB8200 is a “classic” DOCSIS 3.1 modem that still makes sense in 2026 for many standard gigabit plans—especially if you don’t need Mid-Split uploads or multi-gig ports. It’s a mature, stable model that’s widely compatible with major cable ISPs.
- Very reliable, widely deployed model
- Great fit for standard 300–1000 Mbps plans
- Compatible with most major cable ISPs
- No 2.5GbE port (caps real-world top speed)
- Not the right pick for Mid/High-Split upload tiers
2026 Modem Comparison Table
| Model | Max Download | 2.5G Port? | Split Support | Primary ISP |
|---|---|---|---|---|
| Arris S33 | 2,500 Mbps | Yes | Standard | All major |
| Netgear CM3000 | 2,500 Mbps | Yes | Mid/High-Split | Xfinity/Cox |
| Hitron CODA56 | 2,300 Mbps | Yes | Mid-Split | Spectrum/Xfinity |
| Arris SB8200 | 1,000 Mbps | No | Standard | Budget Plans |
Buying Guide: What Matters in 2026?
1. The “Split” (Upload Speeds)
For years, cable internet was known for weak uploads (often ~35 Mbps). In 2026, many ISPs are improving upstream performance using Mid-Split (often ~100–200 Mbps uploads) and High-Split (in some areas, up to ~1 Gbps uploads). If you work from home, upload large files, stream, or rely on cloud backups, choosing a modem that matches your ISP’s upgrade path matters.
Quick rule: If your ISP advertises “enhanced / next-gen / faster uploads,” don’t buy a standard-only modem—choose a split-ready model like the CM3000 or CODA56.
2. Broadcom vs. Intel Puma (Why It Still Matters)
Some older cable modems used Intel Puma chipsets (notably Puma 6/7), which became notorious for latency spikes and jitter—especially noticeable in gaming, video calls, and live streaming. Our picks focus on modern, stable silicon such as Broadcom and newer alternatives used in today’s best-performing DOCSIS 3.1 hardware.
3. Multi-Gig Ports (2.5GbE)
If you pay for 1,000 Mbps internet, you’re often over-provisioned—meaning real-world speeds can exceed 1,000 Mbps. A standard 1GbE port can cap you around ~940 Mbps in practice. That’s why a 2.5GbE port is a top priority in 2026 if you want to actually receive the speed you’re paying for.
Frequently Asked Questions
Is DOCSIS 3.1 obsolete in 2026?
No. DOCSIS 4.0 exists, but most real-world US cable infrastructure is still optimized around DOCSIS 3.1. A good DOCSIS 3.1 modem should remain a strong choice for years—especially if it has the right port speed and split compatibility for your ISP.
Can I use these modems with Fiber?
No. These are cable modems for providers like Xfinity, Cox, Spectrum, and Optimum. Fiber providers like AT&T Fiber or Verizon Fios use ONTs instead. You can find Fiber-compatible devices here.
Do these modems have Wi-Fi?
No—these are stand-alone modems. For best performance, pair your modem with a quality router (in 2026, a solid Wi-Fi 6E or Wi-Fi 7 router is ideal depending on your devices and home layout). Shop Gigabit WiFi Routers Here.
