Network

Port Range Planner

Plan port ranges against concurrent session requirements.

Last validated: 2026-02-14

Port Range Planner sizes and validates port ranges for concurrent services or client sessions. It is useful for NAT design, load testing setups, and avoiding collisions in multi-tenant environments. The tool makes capacity and reservation assumptions explicit. Use it before assigning production port policies.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Port Range Inputs

Result

Range size: 2,001 ports

Utilization: 124.94%

Remaining ports: 0

Status: Over-subscribed

Typical Linux ephemeral: 32768-60999

How to use this tool

Enter start/end ranges and expected concurrent usage.
Run the planner to evaluate capacity and overlap risks.
Adjust ranges until you have clear separation and headroom.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Start port: 10000
End port: 12000
Sessions: 2500
Range size: 2001
Utilization percent: 124.9375312343828
Remaining ports: 0
Status: over-subscribed
Ephemeral hint: Typical Linux ephemeral: 32768-60999

Expected Outputs

Start port: 10000
End port: 12000
Sessions: 2500
Range size: 2001

Interpretation

Start port is 10000. Use this as a decision input, not as a standalone conclusion.
End port is 12000. Use this as a decision input, not as a standalone conclusion.
Sessions is 2500. Use this as a decision input, not as a standalone conclusion.
Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Start port

End port

Sessions

Range size

Utilization percent

Remaining ports

Status

Ephemeral hint

Scenario B

Start port

End port

Sessions

Range size

Utilization percent

Remaining ports

Status

Ephemeral hint

Formula References

IPv4/IPv6 addressing rules and common protocol arithmetic.
DNS/WHOIS/network calls depend on external resolvers and current network state.

Assumptions

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