dixsim.jp

What It Is

dixsim is a fixed public IP data SIM service limited to Japanese corporate customers, using NTT docomo’s LTE (Xi) / FOMA service area. It is not a typical residential proxy pool or data center proxy. Instead, it provides a fixed global IP via a mobile data SIM, making it easier for businesses to access servers, admin panels, or business systems that are restricted to specific IP addresses while working remotely.

Core Capabilities and Limitations

From a proxy/VPN perspective, dixsim is closer to “mobile fixed-IP access.” The available information does not disclose support for HTTP, SOCKS5, or VPN protocols, nor does it provide any details about IP pool size. As such, it should not be understood as a service for large-scale IP rotation, web scraping, or multi-country exit nodes. Its key advantage is that each SIM comes with a fixed public IP, with coverage depending on NTT docomo’s service area in Japan. The advertised speed is up to 375Mbps downlink and 50Mbps uplink, and it states that there is no speed throttling based on the most recent 3 days of usage. However, “unlimited” does not mean truly unlimited: if average monthly traffic exceeds its assumed threshold of around 20GB, extremely heavy usage may be restricted.

Pricing and Contract

The fee structure is straightforward: the unlimited data SIM with a fixed IP costs 3,300 JPY/month before tax, with an initial fee of 2,300 JPY and a delivery handling fee of 500 JPY per shipment. The service is limited to corporate customers, with a minimum contract term of 1 year. Early termination incurs a penalty calculated as the remaining contract period × 400 JPY. An SMS option is also available, with a base fee of 400 JPY/month, while sent messages are charged separately based on usage.

Pros and Cons

The advantages are clear fixed public IP assignment, mature NTT docomo coverage, and availability from just 1 SIM, making it suitable for small and midsize businesses that need a fixed remote IP entry point. The downsides are that it is corporate-only, has a relatively long lock-in period, and comes with a reference traffic threshold of around 20GB. It also does not disclose logging policies, anonymity features, payment methods, or proxy protocol support, so it cannot be considered a substitute for anonymous proxies or large-scale proxy networks.

Who It’s For and Access from China

It is suited to companies that need a fixed IP on Japan’s mobile network, such as for IP whitelist access to office backends, server SSH, or admin dashboards. For users in China, the available text does not specify website accessibility, payment methods, or the cross-border purchase process, so these remain unknown. If you need multi-country proxies, HTTP/SOCKS5 interfaces, or large-scale IP rotation, traditional residential proxy, mobile proxy, or data center proxy services would be more appropriate alternatives.