Cable Modems

Buying guide

DOCSIS 4.0 Modems: Which Ones Exist and Can You Buy One?

No DOCSIS 4.0 modem is sold at retail as of November 2026; this guide lists every DOCSIS 4.0 modem and gateway in service, explains why none has reached store shelves, and names the DOCSIS 3.1 modems to buy instead.

NewNov 13, 202612 min read

Review

Best DOCSIS 3.1 Modems: Top Cable Modem Picks for Every Plan and ISP

The best DOCSIS 3.1 cable modems and modem router combos for Xfinity, Spectrum, Cox, Optimum and Mediacom, ranked by plan speed, upload support, phone service and WiFi, with every model checked against the providers' approved lists.

Aug 5, 202626 min read

Troubleshooting

Modem & Router Lights Meaning: What Every LED Color Means

What does that blinking light on your modem or router mean? This guide covers every LED color and pattern across Xfinity, Spectrum, AT&T, and CenturyLink gateways, with step-by-step fixes for the most common issues.

Aug 2, 20268 min read

Setup

Best Modems for Xfinity 2026: Next Gen Upload Picks

Xfinity keeps two device lists, and the second one decides whether you get mid-split upload speeds. Here are the modems that qualify at each plan level, why the Arris S33 is not one of them, and how refurbished units activate on the...

Nov 7, 202510 min read

ARRIS DG3450: DOCSIS 3.1 Modem Router Combo Specs and Compatibility

The ARRIS DG3450 replaces a rented Spectrum gateway with one box you own. Here is what it does, which providers support it, and what a renewed unit costs.

Oct 28, 20257 min read