The World Report maintained by the Hurricane Electric corporation provides a detailed list of networks, including Internet Service Providers (ISPs), that support Internet Protocol version 6 (IPv6) in countries around the world. For a country of interest, click on the "Report" button in the Report column to view a report. Networks and ISPs that show non-zero entries in their "Routes v6" column offer IPv6 services. 

A less detailed list of ISPs in countries and regions around the world is available here. In the left-hand column, under Deployment by country and region, scroll down to and click on a country or region to view a report

The ipv6 test website provides listings for several categories of IPv6 utilization. Scroll down and click on the “Select country” button to view a country of interest. 

Some ISPs, research networks and government networks which began providing or planning to provide dual stack (IPv6 in addition to legacy IPv4) early in the deployment of IPv6 are listed below. A statement of IPv6 support was often available. Click on an ISP or network name to view the statement. 

ISP or Network Name Commencing in
Commercial ISPs
American Telephone and Telegraph Corporation (AT&T) An IPv6 FAQ is available. 2009
Charter Communications (including Charter Spectrum, formerly Time Warner Cable/Road Runner and Bright House Networks) An IPv6 FAQ is available. 2010
Cogent Communications, Inc. 2009
Comcast Corp. doing business as Xfinity. An IPv6 FAQ is available. 2009
Cox Communications, Inc. (residential services) An IPv6 FAQ is available. 2016
Cox Communications, Inc. (business services and GIGABLAST) An IPv6 FAQ is available. 2017
Hurricane Electric, LLC An IPv6 FAQ is available. 2001
Lumen Technologies, LLC, formerly CenturyLink, Inc. (which in turn was formerly Qwest Government Services Inc.) 2010
MediaCom Communications 2016
NTT America, Inc./Verio 2003
Sprint Corp. (formerly Sprint Nextel Corp.) (See Note 1 below.) 2007
Starlink, a division of Space Exploration Technologies (commonly referred to as SpaceX) An IPv6 FAQ is available. 2022
T-Mobile US, Inc. (See Note 1 below.) An IPv6 FAQ is available. 2019
Verizon Wireless (Cellco Partnership d/b/a Verizon Wireless), a subsidiary of Verizon Communications, Inc. (formerly  MCI Communications Services, Inc.) An IPv6 FAQ is available. 2005
Verizon Fios [Note: Verizon Wireless is in the process of upgrading its regional fiber-optic Fios network on a limited basis and has been ever since 2010.] A statement of IPv6 support is available – search the IPv6 FAQ in the above Verizon Wireless entry for "Fios" to view it. Still not widely supported
Research Networks
Australian Academic and Research Network (AARNET) 2014
CANARIE, Canada’s Advanced Research and innovation Network 2010
China Education and Research Network 2 (CERNET2) (an IPv6-only network) 2016
India Research & Education Network (ERNET) An IPv6 FAQ is available. 2004
JANET (originally known as Joint Academic NETwork) 1999
Grand European Academic NeTwork (Géant) and 13 other European national research networks 2003
Internet2 Network (formerly known as Abilene, also known as University Corporation for Advanced Internet Development or UCAID) 2002
Victorian Industry Collaborative IPv6 (VIC6) Testbed Network 2009
Government Networks
Defense Research and Engineering Network (DREN) operated by the Department of Defense (DoD) High Performance Computing Modernization Program (HPCMP) (See Note 2 below.) 2003
 Energy Sciences Network (ESNET) operated by the Department of Energy (DoE) 2002 
 NASA Research and Engineering Network (NREN) operated by the National Aeronautics and Space Administration (NASA) 2003 
 National Lambda Rail (NLR) PacketNet operated by NASA  2005 (Ceased operation in 2014)
 Sensitive but Unclassified IP Data (SBU IP Data formerly known as NIPRNet) operated by DoD Defense Information Systems Agency (DISA) 2016 

Note 1: Sprint Corp. and T-Mobile US, Inc. began the process of merging in early 2018 and completed it in early 2020. The company is now called T-Mobile US, Inc.
Note 2: The HPCMP DREN also serves as an ISP for the DoD research and engineering community, and (on a case-by-case basis) for other government organizations. This IPv6 Knowledge Base is an outgrowth of work done by DREN. 

A listing of ISPs, research networks and government networks that were providing dual stack services as of June, 2012, is available on the (now archived) World IPv6 Launch website. 

Outside the US, a partial listing of commercial ISPs that provided dual stack services as of June, 2017 may be found here. (It is no longer possible to filter the list for a specific country.)

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