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Hazuu Tools

Random Port Generator

Generate random network port numbers for testing and development.

Between 1 and 50

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No port numbers generated yet

Set how many you need, then click Generate.
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About Random Port Generator

The Random Port Generator produces valid TCP/UDP port numbers in the range 0–65535 on demand. Unlike a generic random number generator, it is scoped specifically to the port space, so every result you get is a legitimate port value you can use in a network configuration, test script, or firewall rule without having to remember the upper bound or add validation yourself.

The most common uses are development and QA work: spinning up multiple local services without collision, seeding a database with realistic-looking network data, writing integration tests that bind to unpredictable ports to avoid conflicts with other processes, or populating mock API responses that include host and port fields. You can request 1 to 50 ports per click and copy them individually or all at once as a newline-separated list ready to paste into a config file or terminal.

All generation runs entirely inside your browser using the JavaScript Math.random API. Nothing is transmitted to any server, so port numbers you intend to use in a private or air-gapped environment stay on your machine. The tool is free with no account, no rate limit, and no usage cap.

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Key Features

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Scoped to the valid port range

Every number produced falls between 0 and 65535, the full TCP/UDP port space. You never get an out-of-range value that would be rejected by a server or firewall.

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Batch generation up to 50 ports

Generate one port or up to fifty in a single click. Each result is independently drawn, making the batch useful for seeding test datasets or assigning ports to a fleet of services at once.

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Copy individually or all at once

Click any single port to copy it, or use Copy All to get every result as a newline-separated list, ready to paste directly into a config file, shell script, or spreadsheet.

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No server round-trip

Generation happens in your browser via Math.random. No request ever leaves your machine, so ports for internal or sensitive environments stay private.

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Plain numeric output

Results are bare integers with no formatting, quotes, or surrounding text, so you can paste them straight into YAML, JSON, environment variables, or terminal commands without cleanup.

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Instant and free

Click Generate and results appear immediately. No sign-up, no paywall, and no limit on how many sessions you run.

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How to Use

01

Set Count

Enter how many random port numbers you want to generate (1 to 50).

02

Generate

Click the Generate button to instantly create random port numbers.

03

Copy & Use

Copy individual ports or use Copy All to grab every generated port at once.

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Example

Set the count to 5 and click Generate. Each result is a random integer in the 0–65535 range, one per line.

Count requested
5
Generated port numbers
14382
51907
3291
60114
27845
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Common Use Cases

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    Local development without port collisions

    When running several microservices or containers simultaneously on a single machine, picking a random port for each avoids the "address already in use" error that derails a dev session. Generate a handful, pick ones that are free, and drop them into your .env or docker-compose file.

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    Writing port-agnostic integration tests

    Integration tests that hard-code a port number fail when that port is already occupied on a CI runner. Generating a random port for each test run and passing it to the server under test makes your suite resilient to whatever else is already listening on the machine.

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    Seeding realistic-looking network data

    Unlike the random-number-generator (which produces integers across any range) or the random-string-generator (which produces text), this tool outputs values that are semantically correct port numbers. Use them in database fixtures, mock API responses, or network simulation data where the values must parse as ports without additional validation.

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    Firewall and ACL rule drafting

    Security engineers drafting firewall allow/deny rules sometimes need placeholder port values to illustrate rule templates before final ports are assigned. A batch of random but valid port numbers is more realistic than hand-typed examples.

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    Network education and protocol demonstrations

    Instructors teaching TCP/IP socket programming use random ports in demos so students see realistic values rather than always-the-same examples like 8080 or 3000, which can create the false impression those are the only valid choices.

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Frequently Asked Questions

What is a Random Port Generator? expand_more
A Random Port Generator creates random network port numbers within the valid range of 0 to 65535. These port numbers are useful for testing server configurations, development environments, database seeding, and educational purposes.
What is the valid port number range? expand_more
Network port numbers range from 0 to 65535. Ports 0–1023 are well-known ports reserved for common services (HTTP, FTP, SSH). Ports 1024–49151 are registered ports. Ports 49152–65535 are dynamic or private ports.
How many ports can I generate at once? expand_more
You can generate between 1 and 50 random port numbers at a time. Each port is independently generated as a random number between 0 and 65535.
Are the generated ports guaranteed unique? expand_more
Each port is independently and randomly generated. While duplicates are statistically unlikely with small counts, there is no deduplication applied. For guaranteed uniqueness, generate a few extra and remove any duplicates manually.
Is this tool free and private? expand_more
Yes, the Random Port Generator is completely free and runs entirely in your browser. No data is collected or transmitted to any server.
How is this different from a Random Number Generator? expand_more
The Random Number Generator on this site lets you set any lower and upper bound and optionally produces floats or applies formatting. The Random Port Generator is intentionally locked to the 0–65535 range that TCP and UDP define as valid, so you get a semantically correct port integer every time without configuring bounds or filtering results yourself.
Which port range should I avoid for development? expand_more
Ports 0–1023 (the well-known range) require root or administrator privileges to bind on most operating systems. For development servers running as a normal user, stick to ports 1024 and above. The dynamic range 49152–65535 is typically the safest choice because operating systems use it for ephemeral outbound connections, so those ports are rarely occupied by long-running services.
Can I use these ports in production? expand_more
The generated values are random and not checked against your system. For production deployments, verify that a chosen port is not already in use (e.g., with lsof -i :<port> on Linux/macOS or netstat -ano on Windows) and that it is allowed by your firewall and cloud security group rules.