Dynamic / Ephemeral Port (49152–65535) Regex for Python

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching dynamic / ephemeral port (49152–65535), ported and verified for Python. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Python project — whether you're validating in a Django view, a FastAPI endpoint, or a standalone data processing script.

Python Implementation

# Dynamic / Ephemeral Port (49152–65535)
# ReDoS-safe | RegexVault — Web & Network > Port

import re

dynamic_ephemeral_port_4915265535_pattern = re.compile(r'^(?:6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|5[0-9]{4}|4[9][0-9]{3})$')

def validate_dynamic_ephemeral_port_4915265535(value: str) -> bool:
    return bool(dynamic_ephemeral_port_4915265535_pattern.fullmatch(value))

# Example
print(validate_dynamic_ephemeral_port_4915265535("49152"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > Port category and carries a ReDoS-safe certification. That matters for Python developers because particularly important in Python web servers where CPU-bound regex operations can stall concurrent request handling. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Ephemeral range 49152-65535. Pattern covers 49000-65535 — validate the lower bound (>=49152) with integer comparison for precision. Linux ephemeral range (32768-60999) may differ from IANA spec.