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Planning

DHCP pool calculator — address ranges and exclusions

Plan an IPv4 DHCP pool with a proposed gateway, client range and exclusions. Work through an example without changing device settings.

Prepared by: IPTools — editorial methodPublished: Updated: Report an issue
New to this tool? Start here.

Click an example below the form. Look at the result, then change one value to compare what happens.

DHCP
A service that automatically gives devices IP addresses and other network settings. A pool is the range of addresses available to assign.
Gateway
Usually the router address used to reach other networks. We propose the first usable address here; check it against your actual configuration.

01 / Input

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Local
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02 / Your result

A result you can understand.

Fill in the form or choose an example. You will see the values and how they were calculated.

How to use it

This is an address plan: the first usable address is proposed as the gateway. Start exclusions apply to the addresses after that gateway. This tool does not configure a DHCP server.

A little network lab

A client pool with room for printers

In 192.168.1.0/24, use the first host address for the gateway and the next ten for statically addressed devices. Find the remaining DHCP client range.

Example result192.168.1.12–192.168.1.254 · 243Open example in calculator

  1. Usable hosts run from .1 to .254. This plan proposes .1 as the gateway; .0 and .255 are outside the host pool.

  2. Ten exclusions after the gateway cover .2–.11. The first client-pool address is therefore .12, not .11.

  3. The range .12–.254 contains 254 − 12 + 1 = 243 addresses. Add 1 because both endpoints are included.

Your turn

What changes if you exclude five addresses at the end?

Show answer and explanation

Addresses .250–.254 are excluded. The pool ends at .249 and contains 238 addresses: .12–.249.

Official documents

Standards & sources

Sources checked:

The date refers to checking the listed documents and registries, not endorsement by their authors. Calculation assumptions and limits appear with the result. How we prepare the material.