Internet Addressing: IPv4 Exhaustion and the Transition to IPv6

22 October 2013

A well-functioning internet addressing system is critical to the quality of UK consumers’ internet access services. In order to improve our understanding of future issues in internet addressing, Ofcom has commissioned two independent reports from InterConnect Communications (ICC).

These reports explore the implications of the exhaustion of Internet Protocol version 4 (IPv4) addresses. The first report, Internet Protocol Version 6 (IPv6) Deployment Study, commissioned in early 2012, examines the status and prospects of transition to the IPv6 addressing system, including the current position with regard to IPv4 usage and the potential implications of IPv4 exhaustion. The second report, commissioned in December 2012, focuses on Carrier Grade Network Address Translation (CGN), a technology that is being used to facilitate the transition from IPv4 to IPv6, and on the potential implications of the introduction of this technology.

Ofcom will continue to address both IPv4/IPv6 transition and CGN implementation in the regular telecoms Infrastructure Reports and Updates and in standalone studies where appropriate.

Full report

MC-111 Internet Protocol Version 6 Deployment Study - Final Report (PDF, 1.6 MB)

MC-159 Implications of Carrier Grade Network Address Translators - Final Report (PDF, 2.1 MB)