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10 Best Optimum Online Compatible Modems 2025 in the United States

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Our Top Picks

#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.

This makes it a great choice for homes with multiple users who engage in bandwidth-heavy activities like gaming and streaming. The inclusion of four gigabit Ethernet ports and a USB 3.0 port offers versatile connectivity for various wired devices. However, it is important to note that this modem is not compatible with DSL providers, Verizon, AT&T, DirecTV, DISH, or any bundled voice services, which could limit its usability for some users. Additionally, it replaces both your modem and router, potentially saving up to $168 per year in rental fees.

The Nighthawk app simplifies setup and management, while the NETGEAR Armor software provides enhanced security features out of the box, though the full suite requires a subscription after a 30-day trial. The high performance and security features are big pluses, but the initial cost might be a consideration for budget-conscious buyers. The device's size and weight might also be bulkier compared to other models. Despite these minor shortcomings, the NETGEAR Nighthawk CAX30 stands out as a powerful and efficient modem router combo, particularly for those with high-speed internet plans and a need for comprehensive security features.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Speed
The modem supports up to 2700mb, providing a necessary cushion for future upgrades.
Compatibility
It works flawlessly with my 1g plan from Spectrum and has all the features you would want from a good combo unit.
#2

ARRIS (SB8200) - Cable Modem - Fast DOCSIS 3.1 32x8 Gigabit Cable Modem , Approved for Comcast Xfinity, Cox, Charter Spectrum, & more | 1 Gbps Max Internet Speed, 4 OFDM Channels

The ARRIS SB8200 is a robust DOCSIS 3.1 cable modem, designed for high-speed internet access with compatibility for major U.S. cable providers such as Comcast Xfinity, Cox, and Spectrum. This modem offers a maximum internet speed of 1 Gbps and features four OFDM channels for improved performance. Ideal for users looking to enhance their home connectivity, it supports HD multimedia streaming and reduces lag, which is beneficial for gaming and heavy internet usage.

A notable feature is its potential to save users up to $168 per year in rental fees by owning the modem outright. Additionally, the modem includes two 1-Gigabit Ethernet ports, allowing for direct connection to a Wi-Fi router or wired devices, expanding its usability. However, it's important to note that this device does not have a built-in router, so users will need to invest in a separate Wi-Fi router for wireless networking.

The SB8200 is easy to set up with the SURFboard Central App and comes with dedicated customer support for assistance. While it is compatible with numerous internet service providers, users should confirm compatibility with their ISP. The lack of telephone ports may be a drawback for users needing VoIP services. Despite this, the ARRIS SB8200 is a strong contender for those seeking a high-performance modem for optimum online compatibility.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Speed
The modem pairs excellently with high-performance routers like the Asus RT-AX88U Pro, delivering fast and stable internet speeds.
Ethernet Ports
Compact design with dual Ethernet ports enhances its usability and convenience.
#3

ARRIS (S34) - Cable Modem - Fast DOCSIS 3.1 Multi-Gigabit Cable Modem, for Comcast Xfinity, Cox, Spectrum & More, 2.5 Gbps Max Internet Speeds, Next-Generation Upload Optimized, 2 Year Warranty

The ARRIS SURFboard S34 is a high-performance cable modem designed to offer a robust internet experience with its DOCSIS 3.1 technology, which is much faster and more secure compared to the previous DOCSIS 3.0 standard. This modem is capable of supporting internet speeds up to 2.5 Gbps, making it ideal for users with high-bandwidth needs, like streaming HD videos, gaming, and using multiple devices simultaneously.

The modem is compatible with major U.S. cable internet providers, including Comcast Xfinity, Cox, and Spectrum, and its future-proof technology ensures it will handle upcoming faster internet plans efficiently. Another significant advantage is the potential savings on cable modem rental fees, as owning the modem could save up to $168 per year depending on the provider. Setting up the modem is straightforward, with a user-friendly process involving the SURFboard Central App. It also includes features to optimize upload speeds, which can be beneficial for users who frequently upload large files or participate in live streaming.

However, a drawback is that it doesn't include a built-in Wi-Fi router, so you'll need to purchase one separately if you require wireless connectivity. The device includes a 2.5 Gbps Ethernet port and an additional 1 Gbps Ethernet port, allowing for flexible and high-speed wired connections. Given its advanced features and speed capabilities, this modem is best suited for tech enthusiasts, heavy internet users, and households looking to future-proof their internet setup.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Speed
Excellent performance with speeds exceeding expectations, consistently delivering over the purchased speeds.

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.

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