Department of Defense
High Performance Computing Modernization Program


Almost all unclassified networks are interconnected via the Internet which has been continuously expanding in size since the standardization of the Internet Protocol Suite in 1982. The functionality of the Internet has also been expanding. Examples of functionality expansion include:

  1. The World Wide Web (WWW) began appearing on the Internet around 1991.
  2. Internet Protocol version 6 (IPv6) began appearing on the Internet beginning in 1998. 
  3. The Internet of Things (IoT) began appearing on the Internet around 2003. This document summarizes the advantages and benefits of IPv6 in the deployment of IoT.
  4. Precursors to the Industrial IoT (IIoT) began appearing in 1982 under various names. The IIoT (also known as Industry 4.0) began appearing on the Internet in 2006. (More than you probably will ever want to know about terms related to IoT and IIoT can be found in this A-to-Z Guide To the Internet of Things).

While the WWW, IPv6, IoT, and IIoT have all significantly expanded the capabilities of the Internet, only IPv6 has significantly changed the process of deploying the networks that make the Internet possible..

IPv4 is almost fourty years old. This critical part of the Internet’s infrastructure is approaching its end of life, as the American Registry for Internet Numbers issued the last remaining IPv4 addresses in its free pool on September 24, 2015. This won’t have an immediate impact on the way people use the Internet, but both the exhaustion of IPv4 addresses and the efforts to deploy IPv6 addresses are impacting the way United States Federal departments and agencies, state and local government organizations, academic institutions and commercial businesses use the Internet, as described at length by this article.

The impact of IPv4 address exhaustion on Internet use is described in this 2019 roundup of the state of the Internet by Geoff Huston, while the impact of IPv6 address deployment on Internet use is described: 

  • around the world by this Internet Society 2018 State of the Internet publication, and
  • across the United States in the homes of network users by this Federal Communications Commission 2016 Guide for IPv6 Consumers publication.

Where to Begin

A first time visitor to the IPv6 Knowledge Base might want to begin by skimming the Purpose and Structure of the IPv6 Knowledge Base in the Frequently Asked Questions section in the column to the left and then explore the Initial Introduction and Overview of Lessons Learned articles in the General Information section. Someone just starting to think about deploying IPv6 or in the early phases of a deployment might want to explore the Before you Begin and Overview of Process articles in the Deployment section.

Additional IPv6 Knowledge Base highlights include:

DREN and IPv6

DREN started supporting IPv6 in June, 2003, when it was designated as the first Department of Defense (DoD) IPv6 pilot network by the Assistant Secretary of Defense (Networks and Information Integration)/DoD Chief Information Officer [ASD(NII)/DoD CIO]. By July, 2005, the entire DREN wide-area network was routinely supporting end-to-end IPv6 traffic, sites were supporting IPv6 along with IPv4, and selected applications were IPv6 enabled. DREN has provided its users with servers, services and client applications using IPv6 since then. During the worldwide deployment of IPv6, DREN will continue providing a secure, high-performance IPv6 infrastructure with legacy support for IPv4.

To contribute an article to the IPv6 Knowledge Base, or to correct/update an existing article, please contact ipv6-team [at]