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THE FEUTEX TOOLKIT

TCP Advertised Window Decode

Decode a shifted receive-window field and quantify its granularity.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formulawindow=field×2ˢʰⁱᶠᵗ
Sources and model references

Worked example

Inputs

Sixteen-bit window field
32000
Negotiated scale shift
7

Expected results

Advertised window
4096000 bytes
Window step size
128 bytes
Maximum with this shift
8388480 bytes

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 the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "field": 32000,
  "shift": 7
}

Accuracy and scope

Established TCP segments only; SYN window fields are not scaled. Simplified analytical model; not a design recommendation or safety certification.

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.