Mode
Ephemeral + exclude 3000,8080
Sample output
53112
Encoding & Decoding
Random Port Generator for Local Development
Generate random ports in IANA ephemeral or registered ranges, with optional custom ranges, exclusion lists, and batch output. Helps avoid common port collisions for local services, Docker, and integration testing. Generation stays in the browser.
PortsRandomNetworking
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Random Port Generator
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Use cases
- Pick host ports for docker-compose services
- Choose non-colliding listen ports for local microservices
- Produce a batch of candidate ports for a team
How to use
- Choose ephemeral, registered, or a custom range
- Optionally list ports or ranges to exclude
- Generate and copy the port list
Example input and output
FAQ
What is the difference between ephemeral and registered ranges?
Ephemeral defaults to 49152–65535; registered uses 1024–49151. Both avoid privileged ports below 1024.
Does the result guarantee the port is free on my machine?
No. The tool only applies range and exclusion rules. It does not probe local listeners—confirm availability before deploying.
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