This article covers NETGEAR Cm500ケーブルモデム.

Overview

The NETGEAR CM500 is a DOCSIS 3.0 cable modem that delivers download speeds up to 400Mbps. It is designed for streaming HD video, online gaming, and general home internet use without the extra cost of a modem rental. This is a standalone modem — it does not include a Wi-Fi router, so you will need a separate router for wireless connectivity.
Weighing just 280 grams and compact in size, the CM500 fits easily on any desk or shelf. It features a single Gigabit Ethernet port for wired connections, ensuring stable and reliable performance. Compatible with major cable providers such as Comcast (Xfinity), Spectrum, Cox, and Cablevision, it is a popular choice for users looking to save on monthly rental fees.

Connectivity & Compatibility

  • Interface: 1× Gigabit Ethernet (RJ-45)
  • Standard: DOCSIS 3.0 (downstream up to 400Mbps, upstream up to 100Mbps)
  • Compatible providers: Comcast (Xfinity), Spectrum, Cox, Cablevision, and other major cable ISPs
  • Note: This is a modem only — no built-in Wi-Fi. A separate router is required for wireless internet.
  • Configuration: Requires a web browser (Internet Explorer 5.0+, Firefox 2.0+, Safari 1.4+, or Google Chrome 11.0+)

Product Info

The NETGEAR CM500 sits in the entry-level to mid-range segment of cable modems. It supports DOCSIS 3.0, which is sufficient for most home internet plans up to 400Mbps. Although it has been on the market for several years, its reliability and low price keep it relevant for budget-conscious users.

  • Release: Around 2015 (still widely available)
  • Price: Approximately ¥9,000–¥10,000 on Japanese online retailers (as of September 2026)
  • Warranty: Standard 1-year manufacturer warranty
  • Accessories: Power adapter, Ethernet cable, quick start guide
  • Availability: Japanese online retailers, electronics retailers, online stores
    Market positioning: Cost-effective entry-level model. Not compatible with DOCSIS 3.1 or gigabit+ plans, but ideal for 400Mbps and below.

Best Use Cases

  • Cable internet households: If you are paying a monthly modem rental fee, buying the CM500 can save you money over time. Best for plans up to 400Mbps.
  • Wired-only users: Those who connect their PC or game console directly via Ethernet and do not need Wi-Fi from the modem. The CM500 provides a stable wired connection.
  • Budget-minded buyers: It offers solid performance at a lower price than DOCSIS 3.1 modems. However, if you plan to upgrade to a gigabit plan in the future, consider a DOCSIS 3.1 model instead.
    Not recommended for: Users who need a modem with built-in Wi-Fi, or those subscribed to internet plans exceeding 400Mbps.

Product Disclosure (Amazon)

  • Manufacturer: NETGEAR
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B00R92CEVU
  • Note: This article covers a manufacturer-made product based on Amazon listing details.