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10 Best Optimum Online Compatible Modems 2026 in the United States
#1
Winner
NETGEAR Nighthawk Modem Router Combo (CAX30) DOCSIS 3.1 Cable Modem and WiFi 6 Router - AX2700 2.7 Gbps - Compatible with Xfinity, Spectrum, Cox, and More - Gigabit Wireless Internet
The NETGEAR Nighthawk CAX30 Modem Router Combo is a robust option for those needing a reliable and fast internet connection. It supports the latest DOCSIS 3.1 standard, which ensures high-speed data transmission and is suitable for cable plans up to 2Gbps. The device also features 32x8 channel bonding, contributing to its impressive speed capabilities of up to 2.7Gbps with WiFi 6 technology, providing excellent coverage up to 2,500 sq. ft. and support for up to 25 devices simultaneously.
Rating
10.0
Chosen by1,464
Speed
Compatibility
Most important from
1320 reviews
#2
Arris (G20) - Cable Modem Router Combo - Fast DOCSIS 3.1 Multi-Gigabit WiFi 6 (AX3000), Approved for Comcast Xfinity, Cox, Spectrum & More, 1.0 Gbps Max Speeds, Next-Generation Upload Optimized
The ARRIS G20 is a versatile cable modem router combo designed to handle high-speed internet with ease. Utilizing the latest DOCSIS 3.1 technology, it promises speeds up to 1.0 Gbps, making it apt for activities like HD streaming, online gaming, and heavy downloading. It also supports Wi-Fi 6 (AX3000), which means you can connect multiple devices without worrying about speed drops or lag.
Rating
9.7
Speed
Ethernet Ports
Most important from
149 reviews
#3
NETGEAR Nighthawk Multi-Gig Cable Modem (CM2000) - Compatible with All Cable Providers Incl. Xfinity, Spectrum, Cox - for Cable Plans up to 2.5Gbps - DOCSIS 3.1
The NETGEAR Nighthawk Multi-Gig Cable Modem (CM2000) is a solid choice for those looking to maximize their cable internet plans. With DOCSIS 3.1 technology, it ensures high-speed internet up to 2.5Gbps, making it ideal for heavy internet users, such as gamers or households with multiple devices. The 32x8 channel bonding and OFDM(A) 2x2 ensure stable and fast connections even during peak usage times.
Rating
9.4
Speed
Compatibility
Built-in Router
Most important from
2930 reviews
Top 10 Best Optimum Online Compatible Modems 2026 in the United States
#1
Winner
NETGEAR Nighthawk Modem Router Combo (CAX30) DOCSIS 3.1 Cable Modem and WiFi 6 Router - AX2700 2.7 Gbps - Compatible with Xfinity, Spectrum, Cox, and More - Gigabit Wireless Internet
NETGEAR Nighthawk Modem Router Combo (CAX30) DOCSIS 3.1 Cable Modem and WiFi 6 Router - AX2700 2.7 Gbps - Compatible with Xfinity, Spectrum, Cox, and More - Gigabit Wireless Internet
DOCSIS Standard: DOCSIS 3.1
Channel Bonding: 32x8
Speed: 2.7Gbps
Compatibility: Not compatible with DSL, Verizon, AT&T
Ethernet Ports: Four gigabit ports
Built-in Router: Yes
Chosen by 1464 this week
Arris (G20) - Cable Modem Router Combo - Fast DOCSIS 3.1 Multi-Gigabit WiFi 6 (AX3000), Approved for Comcast Xfinity, Cox, Spectrum & More, 1.0 Gbps Max Speeds, Next-Generation Upload Optimized
Arris (G20) - Cable Modem Router Combo - Fast DOCSIS 3.1 Multi-Gigabit WiFi 6 (AX3000), Approved for Comcast Xfinity, Cox, Spectrum & More, 1.0 Gbps Max Speeds, Next-Generation Upload Optimized
DOCSIS Standard: DOCSIS 3.1
Speed: 1.0 Gbps
Compatibility: Comcast Xfinity, Cox, Spectrum
Built-in Router: Yes
NETGEAR Nighthawk Multi-Gig Cable Modem (CM2000) - Compatible with All Cable Providers Incl. Xfinity, Spectrum, Cox - for Cable Plans up to 2.5Gbps - DOCSIS 3.1
NETGEAR Nighthawk Multi-Gig Cable Modem (CM2000) - Compatible with All Cable Providers Incl. Xfinity, Spectrum, Cox - for Cable Plans up to 2.5Gbps - DOCSIS 3.1
DOCSIS Standard: DOCSIS 3.1
Channel Bonding: 32x8
Speed: up to 2.5Gbps
Compatibility: Xfinity, Spectrum, Cox
Ethernet Ports: 2.5 Gig Ethernet
ARRIS SURFboard SB8200 DOCSIS 3.1 Multi‑Gig Cable Modem | 2 -1Gbps Ethernet Ports | Works with Xfinity, Cox, Spectrum | For Cable Internet Plans up to 2Gbps | Modem Only, Router Required
ARRIS SURFboard SB8200 DOCSIS 3.1 Multi‑Gig Cable Modem | 2 -1Gbps Ethernet Ports | Works with Xfinity, Cox, Spectrum | For Cable Internet Plans up to 2Gbps | Modem Only, Router Required
DOCSIS Standard: DOCSIS 3.1
Channel Bonding: Four OFDM channels
Speed: 1 Gbps
Compatibility: Comcast, Cox, Spectrum
Ethernet Ports: Two 1-Gigabit ports
NETGEAR Nighthawk Modem Router Combo (CAX30S) DOCSIS 3.1 Cable Modem and WiFi 6 Router - AX2700 6.0 Gbps - Compatible with Xfinity, Spectrum, Cox, and More - Gigabit Wireless Internet - NETGEAR Armor
NETGEAR Nighthawk Modem Router Combo (CAX30S) DOCSIS 3.1 Cable Modem and WiFi 6 Router - AX2700 6.0 Gbps - Compatible with Xfinity, Spectrum, Cox, and More - Gigabit Wireless Internet - NETGEAR Armor
Compatibility: Xfinity, Spectrum, Cox
DOCSIS Standard: 3.1
Channel Bonding: 32 downstream, 8 upstream channels
Speed: up to 2.7 Gbps
Ethernet Ports: 4 Gigabit Ethernet ports
Built-in Router: Yes
ISP Support: Xfinity, Spectrum, Cox
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Motorola MG8702 | DOCSIS 3.1 Cable Modem + Wi-Fi Router (High Speed Combo) with Intelligent Power Boost | AC3200 Wi-Fi Speed | Approved for Comcast Xfinity, Cox, and Charter Spectrum
Motorola MG8702 | DOCSIS 3.1 Cable Modem + Wi-Fi Router (High Speed Combo) with Intelligent Power Boost | AC3200 Wi-Fi Speed | Approved for Comcast Xfinity, Cox, and Charter Spectrum
Compatibility: Comcast Xfinity, Cox, Charter Spectrum
DOCSIS Standard: 3.1
Ethernet Ports: Ethernet ports
Built-in Router: AC3200 Wi-Fi router
ISP Support: Comcast Xfinity, Cox, Charter Spectrum
NETGEAR Nighthawk Cable Modem and Router - DOCSIS 3.1 (CM1000) Gigabit, Compatible with All Major ISP Providers Including Xfinity, Spectrum, Cox, for Cable Plans Up to 1 Gbps,Black
NETGEAR Nighthawk Cable Modem and Router - DOCSIS 3.1 (CM1000) Gigabit, Compatible with All Major ISP Providers Including Xfinity, Spectrum, Cox, for Cable Plans Up to 1 Gbps,Black
DOCSIS Standard: DOCSIS 3.1
Speed: 1 Gbps
Compatibility: Xfinity, Spectrum, Cox
Ethernet Ports: 1
Built-in Router: No
NETGEAR Nighthawk Cable Modem CM1200 - Compatible with All Cable Providers Including Xfinity by Comcast, Spectrum, Cox | for Plans Up to 2 Gigabits | 4 x 1G Ethernet Ports | DOCSIS 3.1, Black
NETGEAR Nighthawk Cable Modem CM1200 - Compatible with All Cable Providers Including Xfinity by Comcast, Spectrum, Cox | for Plans Up to 2 Gigabits | 4 x 1G Ethernet Ports | DOCSIS 3.1, Black
DOCSIS Standard: DOCSIS 3.1
Channel Bonding: Combining two 1G ports into 2G
Speed: up to 2Gbps
Compatibility: Xfinity, Spectrum, Cox
Ethernet Ports: Four Gigabit ports
NETGEAR Nighthawk Cable Modem and WiFi 5 Router Combo (C7000) - Compatible with Major Cable Providers incl. Xfinity & Cox - Cable Plans up to 800Mbps - AC1900 (Up to 1.9Gbps) - DOCSIS 3.0
NETGEAR Nighthawk Cable Modem and WiFi 5 Router Combo (C7000) - Compatible with Major Cable Providers incl. Xfinity & Cox - Cable Plans up to 800Mbps - AC1900 (Up to 1.9Gbps) - DOCSIS 3.0
Compatibility: Cable internet providers like Xfinity, Spectrum
DOCSIS Standard: DOCSIS 3.0
Speed: Up to 800Mbps
Ethernet Ports: Four Gigabit Ethernet ports
Built-in Router: Yes
ISP Support: Cable providers only, no DSL or phone
#10
Arris Surfboard S34 DOCSIS 3.1 Multi‑Gig Cable Modem | 2.5Gbps + 1Gbps Ethernet Ports | Xfinity, Cox, Spectrum for Cable Internet Plans up to 2.5Gbps Next Gen Upstream. Modem Only, Router Required
Arris Surfboard S34 DOCSIS 3.1 Multi‑Gig Cable Modem | 2.5Gbps + 1Gbps Ethernet Ports | Xfinity, Cox, Spectrum for Cable Internet Plans up to 2.5Gbps Next Gen Upstream. Modem Only, Router Required
DOCSIS Standard: DOCSIS 3.1
Speed: up to 2.5 Gbps
Compatibility: Comcast Xfinity, Cox, Spectrum
Ethernet Ports: 2.5 Gbps, 1 Gbps ports
Built-in Router: No
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Buying Guide for the Best Optimum Online Compatible Modems
Choosing the right modem for your Optimum Online service is crucial for ensuring a stable and fast internet connection. The modem you select should be compatible with Optimum's network and meet your internet usage needs. Here are some key specifications to consider when picking the best modem for you.CompatibilityCompatibility refers to whether the modem can work with Optimum Online's network. This is important because not all modems are designed to work with every internet service provider. To ensure compatibility, check Optimum's list of approved modems. If a modem is on this list, it means it has been tested and certified to work with their service.
DOCSIS StandardDOCSIS (Data Over Cable Service Interface Specification) is a standard used to transfer data over cable TV systems. The most common standards are DOCSIS 3.0 and DOCSIS 3.1. DOCSIS 3.0 is sufficient for most users and supports speeds up to 1 Gbps, while DOCSIS 3.1 is newer and supports speeds up to 10 Gbps. If you have a high-speed internet plan or want to future-proof your setup, go for DOCSIS 3.1. Otherwise, DOCSIS 3.0 should be adequate.
Channel BondingChannel bonding refers to the number of downstream and upstream channels a modem can use simultaneously. More channels can mean better performance and higher speeds. For example, a 16x4 modem has 16 downstream and 4 upstream channels. For basic internet usage, a 16x4 modem is usually sufficient. For heavy internet usage, such as streaming in 4K or online gaming, consider a 24x8 or 32x8 modem.
SpeedThe speed of a modem is the maximum rate at which it can transfer data. This is important because it determines how fast your internet connection can be. Match the modem's speed capabilities with your internet plan. If you have a 200 Mbps plan, a modem that supports up to 300 Mbps will be sufficient. If you have a gigabit plan, you'll need a modem that supports higher speeds, like 1 Gbps or more.
Ethernet PortsEthernet ports are used to connect your modem to other devices, such as a router or computer. The number of ports can vary, but most modems have at least one. If you plan to connect multiple devices directly to the modem, look for one with multiple Ethernet ports. For most users, one or two ports are sufficient, especially if you use a separate router.
Built-in RouterSome modems come with a built-in router, which can be convenient as it combines two devices into one. This is important if you want to save space and reduce the number of devices you need to manage. However, built-in routers may not offer the same performance or features as standalone routers. If you have specific needs, such as advanced security features or better Wi-Fi coverage, you might prefer a separate modem and router.
ISP SupportISP support refers to the level of customer service and technical support you can expect from your internet service provider when using a particular modem. This is important because if you encounter issues, you want to ensure that your ISP can help you troubleshoot. Using a modem from the approved list ensures that Optimum Online will provide support if needed.