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THE FEUTEX TOOLKIT

TCP TIME WAIT Port Budget

Estimate retained source ports from connection churn and TIME WAIT duration.

Networking workspace● Runs in your browser
01 Your input
02 Your result
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FormulaTIME WAIT tuples = rate*wait; Port headroom = ports-active-rate*wait

Made for real tasks

  • Estimate retained source ports from connection churn and TIME WAIT duration.
Explore step-by-step workflows →

Worked example

Inputs

Closed connections per second
500 connections/s
TIME WAIT duration
60 s
Active connections
1000 connections
Available same-destination ports
60000 ports

Expected results

TIME WAIT tuples
30000 tuples
Port headroom
29000 ports

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter closed connections per second, time wait duration, active connections, available same-destination ports in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "rate": 500,
  "wait": 60,
  "active": 1000,
  "ports": 60000
}

Accuracy and scope

No safe tuple reuse and one fixed remote endpoint; implementation behavior can differ.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.