Enterprise-grade solution for IP address-configuration needs


ISC DHCP offers a complete open source solution for implementing DHCP servers, relay agents, and clients. ISC DHCP supports both IPv4 and IPv6, and is suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the MPL 2.0 license.

ISC is developing a new DHCP server, Kea, which we intend to eventually replace ISC DHCP in most server implementations. We recommend that new implementers use Kea and implement ISC DHCP only if Kea does not meet their needs. The Kea distribution does not currently include either a client or a relay.

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What is DHCP?

The Dynamic Host Configuration Protocol (DHCP) is a network protocol used to assign IP addresses and provide configuration information to devices such as servers, desktops, or mobile devices, so they can communicate on a network using the Internet Protocol (IP). ISC DHCP is a collection of software that implements all aspects of the DHCP (Dynamic Host Configuration Protocol) suite.

DHCP Server

A DHCP server receives clients’ requests and replies to them.

In addition to the open source server from ISC, a number of commercial products provide a management interface and/or an IP address management application that incorporates ISC DHCP as the DHCP server.

DHCP Client

A DHCP client can be bundled with the operating system of a client computer or other IP capable device; it sends configuration requests to the server. Most devices and operating systems already have DHCP clients included.

DHCP Relay Agent

A DHCP relay agent passes DHCP requests from one LAN to another, so that a DHCP server is not needed on every LAN.


4.4.2-P1 Current-Stable Documentation ( KB )
Release Notes ( TXT )
May 2021 TBA
4.1-ESV-R16-P1 ESV Documentation ( KB )
Release Notes ( TXT )
May 2021 TBA
Mailing List

Join the dhcp-users mailing list to offer help to or receive advice from other users.

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Report a Bug

Before submitting a bug report please ensure that you are running a current version. Then log your report as an issue in our ISC DHCP project.

Useful DHCP Tools

Free hosted and open source tools.

Knowledgebase Articles on ISC DHCP

Library of technical tips.


Latest News

ISC’s 2020 Annual Report

With great pride, we present ISC’s annual report for 2020. The year was a terrible one in so many ways, but our organization has been fortunate.


ISC’s 2019 Annual Report

ISC is delighted to release our 2019 annual report. We accomplished a lot last year and are very proud of our efforts!


ISC’s 2018 Annual Report

ISC is delighted to release our 2018 annual report. We are proud of our accomplishments last year and steadfast in our efforts to continually improve our commitment to an open Internet for all.


ISC’s 2016-2017 Annual Report

ISC is pleased to release its 2016-2017 annual report. We are proud to share our accomplishments from the two-year period and look ahead to the future.