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ARRIS S33

ARRIS SURFboard S33 DOCSIS 3.1 cable modem, front view on a white background

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ARRIS S33

Best for cable internet speed plans (maker):
Up to 2.5 Gbps
DOCSIS technology:
DOCSIS 3.1 (2x2 OFDM DOCSIS 3.1 channels; 32x8 bonded DOCSIS 3.0 channels)
Ethernet ports:
One 2.5 GbE and one 1 GbE port

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Package details

Model: S33

ARRIS SURFboard S33 (US retail version)

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing

Important limit: No built-in Wi-Fi: you need a separate router

How many units?

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 5, 2026. Full product details

Right connection. Right box.

Start at the wallBuy the right kind of box

How does internet arrive?

The cable coming into your home decides what belongs here.

Internet service type

Choose your connection before choosing a modem.

The cable modem candidateApproval comes first

ARRIS S33

Fastest Ethernet
2.5 Gbps

Start with the service

A modem is not a Wi-Fi upgrade.

A DOCSIS cable modem translates cable service to Ethernet. Your router handles your home network.

The trap to avoid

A cable modem does not replace a fiber ONT or a DSL modem.

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Source specs & exact version

ARRIS SURFboard S33 DOCSIS 3.1 Cable Modem

ARRIS SURFboard S33 (US retail version)

Recorded model: S33

Specifications checked 2026-11-05.

DOCSIS technology
DOCSIS 3.1 (2x2 OFDM DOCSIS 3.1 channels; 32x8 bonded DOCSIS 3.0 channels)
Ethernet ports
One 2.5 GbE and one 1 GbE port
Built-in Wi-Fi
None (stand-alone modem; pair with your own router)
Digital voice service capability
No

Maker compatibility is a claim. Current ISP approval for your exact tiers and address is not verified here.

Photo credit: manufacturer image source ↗

Specifications explain hardware limits. No performance tests are claimed.

ARRIS SURFboard S33 DOCSIS 3.1 Cable Modem

A stand-alone SURFboard DOCSIS 3.1 cable modem with one 2.5 GbE port and one 1 GbE port, for use with your own router.

Which version should you buy?

Recorded product: ARRIS SURFboard S33 (US retail version).

Pack size

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • SURFboard model numbers differ by DOCSIS speed tier and Wi-Fi; the model number on the front label is the one to match.

Why people pick it

  • 2.5 GbE port for multi-gig cable plans without paying gateway prices
  • DOCSIS 3.1 with 32x8 DOCSIS 3.0 bonded channels, compatible with the major U.S. cable providers
  • 2 year limited warranty, double the G54 gateway's

Know before you buy

  • No built-in Wi-Fi: you need a separate router
  • No digital voice support, so it cannot replace a provider's phone service

Full specifications

Best for cable internet speed plans (maker)Up to 2.5 Gbps
DOCSIS technologyDOCSIS 3.1 (2x2 OFDM DOCSIS 3.1 channels; 32x8 bonded DOCSIS 3.0 channels)
Ethernet portsOne 2.5 GbE and one 1 GbE port
Wired speeds (maker)Up to 2.5 Gbps
CompatibilityCox, Spectrum, Xfinity and other major U.S. cable providers; CableLabs certified and tested/qualified by Cox, Comcast Xfinity and Charter Spectrum
Built-in Wi-FiNone (stand-alone modem; pair with your own router)
Digital voice service capabilityNo
Warranty2 year limited warranty

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

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