NETGEAR Nighthawk CAX30 DOCSIS 3.1 WiFi 6 Modem Router Combo

The NETGEAR Nighthawk CAX30 is a DOCSIS 3.1 cable modem and WiFi 6 router built into a single device. Instead of renting a gateway from your cable company or wiring together a separate modem and router, one box handles both jobs: it connects directly to your coax line and broadcasts 6-stream AX2700 WiFi throughout your home. It is certified for Xfinity, Spectrum, and Cox, and it is sized for cable plans up to 1 Gbps.

Key Takeaways

• The CAX30 combines a DOCSIS 3.1 cable modem with a dual-band AX2700 WiFi 6 router, replacing two devices and eliminating the monthly gateway rental fee, which typically runs $10 to $15 per month.
• It is certified for Xfinity, Spectrum, and Cox on plans up to 1 Gbps. It does not support cable telephone service, and it is not approved for Xfinity Next Gen enhanced upload tiers.
• Four Gigabit Ethernet LAN ports, a USB 3.0 port, and coverage for up to 2,000 square feet and 25 devices make it a strong all-in-one for small and mid-size homes.

One Device Instead of Two

A modem router combo simplifies your setup: one power outlet, one device to reboot, one firmware system to keep updated. The CAX30 pairs its DOCSIS 3.1 modem with a 1.5 GHz dual-core processor and NETGEAR's Nighthawk router platform, so you are not trading away router features to get the convenience of a single box.

The financial case is simple. Cable providers charge a monthly rental fee for their gateways, and those fees add up to well over $100 per year. A purchased combo unit pays for itself, and everything about the network stays under your control: your settings, your WiFi name, your admin password, your firmware.

CAX30 Download Speed: What to Expect

The DOCSIS 3.1 modem section uses OFDM channels for downloads and falls back to 32x8 channel bonding on DOCSIS 3.0 networks. In practical terms, the CAX30 is built for cable plans up to 1 Gbps. On a gigabit plan, wired throughput tops out near 940 Mbps at a single Ethernet port, which is the ceiling of Gigabit Ethernet itself rather than a limitation of the modem.

On the wireless side, the router delivers combined WiFi 6 speeds up to 2.7 Gbps: up to 0.9 Gbps on the 2.4 GHz band and up to 1.8 Gbps on 5 GHz. Individual devices will see a share of that depending on distance, interference, and their own WiFi hardware.

ISP Compatibility

The CAX30 works with most other US cable internet providers as well. It is not compatible with fiber services such as Verizon Fios or AT&T Fiber, DSL services such as CenturyLink, satellite internet, or any plan that bundles cable telephone service, since it has no voice ports. If you are on Xfinity, check your speed tier against our Xfinity approved modems list before buying; for tier-by-tier detail, see the Xfinity compatible modems list by speed tier.

WiFi 6 Coverage and Capacity

NETGEAR rates the CAX30 for up to 2,000 square feet of coverage and up to 25 connected devices. The 6-stream WiFi 6 design handles simultaneous 4K streaming, video calls, and gaming better than the WiFi 5 gateways most cable companies still rent out, because WiFi 6 schedules traffic across devices instead of making them wait in line.

Smart Connect steers each device to the best band automatically, so you run one WiFi name instead of separate 2.4 GHz and 5 GHz networks. For homes larger than 2,000 square feet or with dead zones on a far floor, a mesh system or a wired access point is the better tool; see our modem router combo collection for alternatives.

Ports and Connections

The back panel carries four Gigabit Ethernet LAN ports for wired devices such as desktops, consoles, and TVs. Two of the LAN ports support Ethernet port aggregation, which lets a compatible NAS or workstation link two ports for up to 2 Gbps of wired bandwidth on the local network. A USB 3.0 port lets you share a storage drive across the network.

CAX30 vs CAX30S vs CAX80

The CAX30S is the same AX2700 hardware sold under a different retail SKU, typically bundled with a NETGEAR Armor trial. Speeds, ports, and coverage are identical, so between the two, buy whichever is priced lower.

The CAX80 is the step-up model: AX6000 8-stream WiFi 6, a 2.5 Gbps Ethernet port, and support for multi-gig cable plans. If your plan is 1 Gbps or below, the CAX30 delivers the same internet experience for considerably less. If you are on or planning to move to a multi-gig tier, the CAX80 or a separate DOCSIS 3.1 modem and router pairing is the better fit.

Retail listings may show the model number as CAX30-100NAS, CAX30-200NAS, or CAX30-100NAR. These are packaging and sales-channel codes for the same device.

Setup and the Nighthawk App

Setup runs through the NETGEAR Nighthawk app and takes about 15 minutes:

1. Connect the coax cable to the CAX30, power it on, and wait for the online indicator to hold steady.
2. Open the Nighthawk app and follow the prompts to name your WiFi network and set a password.
3. Activate the device with your provider, either through the ISP's own app or by calling with the CAX30's MAC address ready.
4. Change the router admin password from the default, confirm automatic firmware updates are on, and enable the guest network if visitors will need access.

That last step matters. A combo unit is your network's front door, so a unique admin password and current firmware are the baseline. The included 90-day NETGEAR Armor trial adds device-level threat scanning; whether you keep it after the trial is optional, the built-in protections are not.

Technical Specifications

What's in the Box

• Nighthawk CAX30 cable modem router
• Power adapter
• Ethernet cable
• Coaxial cable
• Quick start guide

Frequently Asked Questions

What download speed does the NETGEAR CAX30 support?

The CAX30 is built for cable plans up to 1 Gbps. Wired throughput reaches about 940 Mbps at a single Gigabit Ethernet port, and WiFi 6 speeds reach up to 2.7 Gbps combined across both bands.

Is the CAX30 compatible with Xfinity?

Yes, the CAX30 is certified for Xfinity plans up to 800 Mbps. It is not on Xfinity's approved list for Next Gen enhanced upload tiers, so customers on those plans should look at the Arris S34, Hitron CODA56, or NETGEAR CM3000 instead.

What is the difference between the CAX30 and the CAX30S?

They are the same hardware. The CAX30S is a separate retail SKU that typically ships with a NETGEAR Armor security trial bundled in. Performance, ports, and coverage are identical.

Should I buy the CAX30 or the CAX80?

Choose the CAX30 for plans up to 1 Gbps. The CAX80 adds 8-stream AX6000 WiFi and a 2.5 Gbps Ethernet port, which only pay off on multi-gig cable plans or in homes with heavy wired demands.

Does the CAX30 work with cable telephone service?

No. The CAX30 has no telephone ports, so it cannot replace a gateway on plans that bundle voice service. Keep the provider's telephony gateway or ask the ISP about a data-only configuration.

How much area does the CAX30 cover?

NETGEAR rates it for up to 2,000 square feet and 25 connected devices. Placement matters: central, elevated, and away from metal obstructions gets the most from any router.

How do I set up the CAX30?

Connect the coax line, power the unit on, and complete setup in the Nighthawk app. You will then activate the modem with your ISP using its MAC address, which takes a few minutes through the provider's app or a phone call.