United States IPv6 in United States

These graphs show the evolution of default protocol, v6 address types, and average bandwidth in United States over time.

They are generated using the data collected by the ipv6-test.com connection test page, and are updated on a monthly basis.

Overall IPv6 and v4 protocol support in United States

This graph shows the evolution of IPv6 support vs IPv4 for all our connection test.

The numbers are percentages, so we can expect almost 100% of hosts supporting IPv4 with a slow growth for IPv6.

Top 25 internet service providers for IPv6 in United States (Mar 2019)

  ISP IPv6 tests count
1.Comcast Cable Communications28,492
2.Google LLC8,038
3.Spectrum5,249
4.Cellco Partnership DBA Verizon Wireless3,577
5.AT&T Internet Services2,210
6.Hurricane Electric LLC2,053
7.Cox Communications Inc.1,358
8.CenturyLink752
9.T-Mobile USA739
10.Hurricane Electric625
11.AT&T Mobility LLC518
12.Choopa501
13.Sprint451
14.Mediacom Communications Corp228
15.Digital Ocean204
16.Google Fiber Inc.169
17.Linode163
18.American Registry Internet Numbers142
19.IT7 Networks Inc90
20.CT Networks88
21.Midcontinent Communications81
22.Amazon.com79
23.QuadraNet69
24.Verizon Communications57
25.So-net Entertainment Corporation51

IPv6 and v4 protocol support in United States (unique addresses)

This graph shows the evolution of IPv6 support vs IPv4 for unique users of our connection test.

The numbers are percentages, so we can expect a slow growth towards 50% v4 / 50% v6.

Top 25 internet service providers for IPv6 in United States (unique addresses, Mar 2019)

  ISP Unique IPv6 addresses
1.Comcast Cable Communications4,151
2.Spectrum2,876
3.Cellco Partnership DBA Verizon Wireless2,445
4.AT&T Internet Services1,186
5.Cox Communications Inc.782
6.Hurricane Electric LLC779
7.T-Mobile USA511
8.CenturyLink413
9.AT&T Mobility LLC314
10.Hurricane Electric296
11.Sprint276
12.Choopa244
13.Mediacom Communications Corp177
14.Google Fiber Inc.124
15.Google LLC92
16.Digital Ocean87
17.Linode60
18.CT Networks54
19.Midcontinent Communications44
20.So-net Entertainment Corporation43
21.American Registry Internet Numbers42
22.Verizon Communications38
23.Facebook Inc32
24.Cisco Systems30
25.IT7 Networks Inc29

Default browser protocol in United States

This graph shows the percentage of browsers that default to IPv6 vs. IPv4 when visiting the ipv6-test connection test.

Hopefully, in the not so distant future, the v6 part will grow taller than the v4 one.

Default browser protocol in United States (dual-stack users)

This graph shows the percentage of browsers that default to IPv6 vs. IPv4 for users that have both v4 and v6 connectivity.

Usually a system will default to v6 when it's available, but in some cases with tunneled connections, v4 stays the default.

Top 25 internet service providers for IPv6 default in United States (Mar 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Utah Education Network600.0%6100.0%
2.The Optimal Link Corporation2600.0%26100.0%
3.Nynex1600.0%16100.0%
4.Google India Pvt. Ltd.600.0%6100.0%
5.WestHost1300.0%13100.0%
6.Contabo GmbH1200.0%12100.0%
7.Hivelocity Ventures Corp600.0%6100.0%
8.University of Pittsburgh600.0%6100.0%
9.Fiberless Networks Corporation500.0%5100.0%
10.Cox Communications Inc1400.0%14100.0%
11.Astound Broadband LLC2500.0%25100.0%
12.Schlund500.0%5100.0%
13.H4Y Technologies LLC2100.0%21100.0%
14.University of Missouri - dba the Missouri Research and Education Network600.0%6100.0%
15.F5 Networks1700.0%17100.0%
16.Cenic600.0%6100.0%
17.Wells Fargo & Company700.0%7100.0%
18.WhiteSky Communications500.0%5100.0%
19.Hoopeston Area Schools900.0%9100.0%
20.1&1 Internet Inc. (11INT)600.0%6100.0%
21.National Science Foundation500.0%5100.0%
22.Southern New England Telephone Company and SNET America1200.0%12100.0%
23.Iran Cell Service and Communication Company500.0%5100.0%
24.Microsoft Corp600.0%6100.0%
25.Google3412.9%3397.1%

IPv6 address types in United States

Here you can see the evolution of address types over time, and measure usage of 6to4 and Teredo tunneled connectivity.

It should be noted that because 6rd works with native addresses, it cannot be detected here as tunneled. This is also the case with VPN based tunnels.

Downstream bandwidth in United States

This graph illustrates the connection speed gap between IPv4 and IPv6, numbers represent v6 speed as percentage of v4 speed.

The lower IPv6 speeds are often caused by tunneling overhead or insufficient v6 connectivity or peering capacity at ISPs.

Top 25 internet service providers for IPv6 speed in United States (Mar 2019)

  ISP Test count IPv6 average
1.Incero LLC9549.2 Mbps
2.Google LLC8,038464.8 Mbps
3.Webpass Inc.20200.7 Mbps
4.Greenlight Networks13193.9 Mbps
5.Google Inc.39187.2 Mbps
6.Facebook Inc49121.4 Mbps
7.Cox Communications Inc14115.0 Mbps
8.Midcontinent Communications81112.0 Mbps
9.University of Pennsylvania32105.0 Mbps
10.Turnkey Internet Inc.21101.5 Mbps
11.Optimum Online34101.0 Mbps
12.Spectrum5,24999.6 Mbps
13.Microsoft Corp689.2 Mbps
14.Comcast Cable Communications28,49288.4 Mbps
15.Cox Communications Inc.1,35886.9 Mbps
16.FranTech Solutions2873.8 Mbps
17.Google Fiber Inc.16971.6 Mbps
18.AT&T Internet Services2,21071.5 Mbps
19.American Registry Internet Numbers14269.7 Mbps
20.Dmitinc3369.3 Mbps
21.Mediacom Communications Corp22869.2 Mbps
22.M247 Ltd4866.6 Mbps
23.Fuse Internet Access755.7 Mbps
24.Google Incorporated2753.8 Mbps
25.Micfo2952.4 Mbps