Japan IPv6 in Japan

These graphs show the evolution of default protocol, v6 address types, and average bandwidth in Japan 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 Japan

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 Japan (Dec 2019)

  ISP IPv6 tests count
1.Jpne3,316
2.Ocn2,910
3.Mf-native62,521
4.Biglobe1,349
5.Bbix1,198
6.Internet Multifeed Co.1,135
7.Asahi391
8.Kddi283
9.So-net Entertainment Corporation273
10.InfoSphere230
11.Hurricane Electric LLC206
12.Softbank BB Corp.184
13.Japan Network Information Center, Internet Initiative Japan Inc.177
14.Japan Network Information Center164
15.Choopa, LLC109
16.Choopa102
17.Jupiter Telecommunication Co. Ltd86
18.NTT Communications Corporation59
19.Linode55
20.K-opticom53
21.M247 Ltd34
22.China Mobile communications corporation31
23.Chubu Telecommunications Company, Inc.27
24.NTTDoCoMo26
25.KDDI Corporation24

IPv6 and v4 protocol support in Japan (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 Japan (unique addresses, Dec 2019)

  ISP Unique IPv6 addresses
1.Jpne2,129
2.Ocn1,780
3.Mf-native61,549
4.Biglobe934
5.Bbix741
6.Internet Multifeed Co.663
7.Asahi261
8.So-net Entertainment Corporation194
9.Kddi193
10.Softbank BB Corp.147
11.Japan Network Information Center, Internet Initiative Japan Inc.135
12.Japan Network Information Center113
13.InfoSphere91
14.Hurricane Electric LLC77
15.Choopa55
16.K-opticom42
17.NTT Communications Corporation39
18.Linode29
19.Jupiter Telecommunication Co. Ltd25
20.NTTDoCoMo23
21.Chubu Telecommunications Company, Inc.20
22.M247 Ltd19
23.Choopa, LLC19
24.KDDI Corporation18
25.Cloudflarewarp15

Default browser protocol in Japan

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 Japan (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 Japan (Dec 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.i3D.net B.V. Tokyo Japan600.0%6100.0%
2.Sony Computer Entertainment Inc, 1-7-1, Konan, Minato-ku, Tokyo 108-0075, Japan500.0%5100.0%
3.Fcc1100.0%11100.0%
4.Tokai800.0%8100.0%
5.Chubu Telecommunications Company, Inc.2727.4%2592.6%
6.its communications Inc.1218.3%1191.7%
7.NTT Communications Corporation5958.5%5491.5%
8.NTTDoCoMo26311.5%2388.5%
9.Jpne3,31640912.3%2,90787.7%
10.Mf-native62,52134113.5%2,18086.5%
11.Biglobe1,34918313.6%1,16686.4%
12.STNet7114.3%685.7%
13.NTT PC Communications, Inc.7114.3%685.7%
14.Ocn2,91044615.3%2,46484.7%
15.So-net Entertainment Corporation2734416.1%22983.9%
16.KDDI Corporation24416.7%2083.3%
17.K-opticom53917.0%4483.0%
18.Bbix1,19821618.0%98282.0%
19.Hurricane Electric LLC2063918.9%16781.1%
20.Zaq21419.0%1781.0%
21.Japan Network Information Center1643320.1%13179.9%
22.Kddi2835820.5%22579.5%
23.Choopa1022120.6%8179.4%
24.Asahi3918120.7%31079.3%
25.InfoSphere2305423.5%17676.5%

IPv6 address types in Japan

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 Japan

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 Japan (Dec 2019)

  ISP Test count IPv6 average
1.Zaq2194.7 Mbps
2.Jupiter Telecommunication Co. Ltd8687.2 Mbps
3.Choopa10235.0 Mbps
4.So-net Entertainment Corporation27334.2 Mbps
5.its communications Inc.1227.6 Mbps
6.Linode5526.4 Mbps
7.K-opticom5324.0 Mbps
8.Ocn2,91023.8 Mbps
9.Choopa, LLC10923.0 Mbps
10.Biglobe1,34920.7 Mbps
11.Jpne3,31620.7 Mbps
12.NTT Communications Corporation5920.1 Mbps
13.Chubu Telecommunications Company, Inc.2720.0 Mbps
14.Mf-native62,52119.6 Mbps
15.Asahi39118.9 Mbps
16.M247 Ltd3418.3 Mbps
17.Japan Network Information Center16418.0 Mbps
18.Kddi28317.6 Mbps
19.Bbix1,19815.5 Mbps
20.InfoSphere23014.9 Mbps
21.Hurricane Electric LLC20614.2 Mbps
22.Internet Multifeed Co.1,13512.5 Mbps
23.Wide1410.2 Mbps
24.Japan Network Information Center, Internet Initiative Japan Inc.1779.0 Mbps
25.Softbank BB Corp.1847.3 Mbps