Commercial Internet Service Providers (ISPs), research networks and government networks began providing dual stack (Internet Protocol version 6 [IPv6] in addition to legacy IPv4) services well before World IPv6 Launch, June 6, 2012. 

A list of ISPs in the United States (US) and other countries that began offering dual stack services on or before World IPv6 Launch is available here. (In the Search box, enter “United States” to filter the list for ISPs in the US.) The ISPs also offer dual stack internet transit services.

Outside the US a partial listing of commercial ISPs that provide dual stack services may be found here. (To filter the list for a specific country, choose "Region/Country" in the pick list () and enter a 2-character country name in the Search box.) In the World Report maintained by the Hurricane Electric corporation, click on the "Report" button in the Report column for the country of interest. ISPs with non-zero entries in their "Routes v6" column offer IPv6 services. Another list of US and international ISPs that provide dual stack services is available here. In China, Alibaba has announced dual-stack service in conjunction with China Telecom, China Mobile, and China Unicom on the Alibaba Cloud, and will provide IPv6-only service in the future.

Some ISPs, research networks and government networks currently providing or planning to provide dual stack service are listed below. For each ISP or network, a statement of IPv6 support is available. Click on the ISP or network name. 

ISP or Network Name Commencing
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 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 currently in the process of upgrading its fiber-optic Fios network on a limited basis and has been since 2010.] An IPv6 FAQ is available – see the Verizon Wireless entry.] Not yet 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 will be called T-Mobile US, Inc. going forward.
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. 

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