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 (Sep 2019)

  ISP IPv6 tests count
1.Jpne4,368
2.Ocn2,886
3.Mf-native62,333
4.Biglobe2,054
5.Bbix1,410
6.Internet Multifeed Co.1,252
7.Asahi621
8.Kddi404
9.Japan Network Information Center285
10.Japan Network Information Center, Internet Initiative Japan Inc.230
11.So-net Entertainment Corporation178
12.Softbank BB Corp.116
13.Choopa104
14.Hurricane Electric LLC96
15.NTT Communications Corporation88
16.Choopa, LLC68
17.i3D.net B.V. Tokyo Japan52
18.K-opticom48
19.Jupiter Telecommunication Co. Ltd44
20.KDDI Corporation36
21.Linode35
22.NTTDoCoMo34
23.Chubu Telecommunications Company, Inc.34
24.M247 Ltd33
25.InfoSphere33

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, Sep 2019)

  ISP Unique IPv6 addresses
1.Jpne2,365
2.Ocn1,812
3.Mf-native61,293
4.Biglobe1,249
5.Bbix832
6.Internet Multifeed Co.787
7.Asahi301
8.Kddi246
9.Japan Network Information Center, Internet Initiative Japan Inc.168
10.Japan Network Information Center167
11.So-net Entertainment Corporation127
12.Softbank BB Corp.89
13.Hurricane Electric LLC68
14.NTT Communications Corporation53
15.Choopa43
16.K-opticom35
17.InfoSphere32
18.NTTDoCoMo31
19.KDDI Corporation30
20.Linode24
21.Chubu Telecommunications Company, Inc.20
22.xTom Limited16
23.Jupiter Telecommunication Co. Ltd16
24.M247 Ltd15
25.interQ14

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 (Sep 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.China Unicom Network1200.0%12100.0%
2.Fcc600.0%6100.0%
3.Tdnc1100.0%11100.0%
4.i3D.net B.V. Tokyo Japan5200.0%52100.0%
5.Zaq2514.0%2496.0%
6.KDDI Corporation36411.1%3288.9%
7.Biglobe2,05424311.8%1,81188.2%
8.Internet Multifeed Co.1,25218414.7%1,06885.3%
9.Japan Network Information Center2854315.1%24284.9%
10.Asahi6219415.1%52784.9%
11.Ocn2,88647416.4%2,41283.6%
12.Mf-native62,33339116.8%1,94283.2%
13.NTT Communications Corporation881517.0%7383.0%
14.Kddi4047117.6%33382.4%
15.Jpne4,36877417.7%3,59482.3%
16.Bbix1,41025618.2%1,15481.8%
17.So-net Entertainment Corporation1783419.1%14480.9%
18.Jupiter Telecommunication Co. Ltd44920.5%3579.5%
19.NTTDoCoMo34720.6%2779.4%
20.K-opticom481020.8%3879.2%
21.Japan Network Information Center, Internet Initiative Japan Inc.2304820.9%18279.1%
22.Sakura19421.1%1578.9%
23.Tokyo Institute of Technology27622.2%2177.8%
24.Chubu Telecommunications Company, Inc.34926.5%2573.5%
25.Choopa1043028.8%7471.2%

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 (Sep 2019)

  ISP Test count IPv6 average
1.Jupiter Telecommunication Co. Ltd4482.4 Mbps
2.Tokai1652.5 Mbps
3.NTTDoCoMo3443.0 Mbps
4.Zaq2542.1 Mbps
5.Chubu Telecommunications Company, Inc.3432.5 Mbps
6.Japan Network Information Center28529.4 Mbps
7.So-net Entertainment Corporation17827.6 Mbps
8.Kddi40427.0 Mbps
9.K-opticom4824.3 Mbps
10.Ocn2,88623.6 Mbps
11.Mf-native62,33322.6 Mbps
12.Jpne4,36821.0 Mbps
13.NTT Communications Corporation8820.6 Mbps
14.xTom Limited2219.9 Mbps
15.Asahi62119.4 Mbps
16.Biglobe2,05418.7 Mbps
17.KDDI Corporation3617.4 Mbps
18.Japan Network Information Center, Internet Initiative Japan Inc.23016.9 Mbps
19.Internet Multifeed Co.1,25216.7 Mbps
20.M247 Ltd3314.1 Mbps
21.Bbix1,41013.6 Mbps
22.Choopa, LLC6812.4 Mbps
23.Hurricane Electric LLC9611.1 Mbps
24.Kir810.4 Mbps
25.InfoSphere3310.2 Mbps