What is PortCyou?

PortCyou is a comprehensive port database built specifically for developers. It lets you search over 10,000 ports, discover which services and applications use them, and avoid port conflicts before they happen. With multi-language support, smart search capabilities, and a developer API, PortCyou turns a common frustration into a solved problem.

Who it's for

• Backend developers who need to quickly check which ports are already in use before configuring new services or containers.
• DevOps engineers managing complex server environments where port conflicts can bring down deployments or cause security holes.
• Full-stack developers working on local development setups who want to avoid the "port already in use" error when running multiple tools simultaneously.

Key features

Smart search across 10,000+ ports

PortCyou indexes over 10,000 ports and 1,200+ software services, organized into 37 categories. You can search by port number, service name, or protocol (TCP/UDP) and instantly see which applications are associated with each port.

Multi-language interface

The platform supports English, Traditional Chinese, Simplified Chinese, and Japanese, making it accessible to a global developer audience. Language switching is seamless and preserves your current search context.

Developer API

PortCyou includes a developer API that lets you integrate port lookup functionality directly into your own tools, scripts, or CI/CD pipelines. This means you can automate port conflict checks without leaving your terminal.

Curated port details

Each port entry includes a clear description, associated software (with links to official projects like OpenSSH, BIND, or FileZilla), and usage frequency indicators. High-use ports are marked so you know which ones are most likely to cause conflicts.

What stands out

"Avoid port conflicts before they happen."

That's the core promise of PortCyou — and it delivers. Instead of hunting through forums or guessing which port a service uses, you get a single, authoritative source. The combination of a massive database, multi-language support, and an API means PortCyou fits into any developer's workflow, whether you're debugging locally or provisioning servers at scale.

Worth checking out if…

You're tired of seeing "port already in use" errors, managing complex service configurations, or working in a team where port conflicts slow down development. PortCyou is especially useful if you work with Docker, Kubernetes, Apache HTTPD, or any stack where multiple services compete for the same ports. It's also a great fit if you need a quick reference for standard ports like SSH (22), HTTP (80), or DNS (53) — or if you want to explore less common ports and the software that uses them.