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 (Nov 2019)

  ISP IPv6 tests count
1.Jpne3,205
2.Ocn2,407
3.Mf-native61,872
4.Bbix1,428
5.Biglobe1,128
6.Internet Multifeed Co.1,019
7.Asahi684
8.Kddi358
9.Japan Network Information Center, Internet Initiative Japan Inc.188
10.So-net Entertainment Corporation180
11.Choopa166
12.Japan Network Information Center144
13.Softbank BB Corp.138
14.Hurricane Electric LLC95
15.Choopa, LLC79
16.Linode76
17.K-opticom62
18.i3D.net B.V. Tokyo Japan60
19.KDDI Corporation40
20.interQ38
21.NTT Communications Corporation37
22.Jupiter Telecommunication Co. Ltd34
23.NTTDoCoMo34
24.Sakura31
25.Chubu Telecommunications Company, Inc.29

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, Nov 2019)

  ISP Unique IPv6 addresses
1.Jpne2,026
2.Ocn1,507
3.Mf-native61,105
4.Bbix864
5.Biglobe760
6.Internet Multifeed Co.568
7.Asahi307
8.Kddi236
9.Japan Network Information Center, Internet Initiative Japan Inc.142
10.So-net Entertainment Corporation100
11.Japan Network Information Center98
12.Softbank BB Corp.95
13.Choopa74
14.Hurricane Electric LLC72
15.Linode45
16.K-opticom40
17.NTT Communications Corporation30
18.NTTDoCoMo27
19.KDDI Corporation25
20.InfoSphere22
21.Jupiter Telecommunication Co. Ltd21
22.M247 Ltd19
23.Chubu Telecommunications Company, Inc.16
24.Choopa, LLC14
25.interQ11

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 (Nov 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Tokai800.0%8100.0%
2.Ssd1300.0%13100.0%
3.Tdnc500.0%5100.0%
4.Mediacat500.0%5100.0%
5.i3D.net B.V. Tokyo Japan6000.0%60100.0%
6.Sakura3113.2%3096.8%
7.Chubu Telecommunications Company, Inc.2926.9%2793.1%
8.its communications Inc.1119.1%1090.9%
9.Kddi358339.2%32590.8%
10.Asahi684649.4%62090.6%
11.So-net Entertainment Corporation180179.4%16390.6%
12.Jpne3,20538612.0%2,81988.0%
13.Internet Multifeed Co.1,01914414.1%87585.9%
14.Kir7114.3%685.7%
15.Biglobe1,12816714.8%96185.2%
16.Mf-native61,87229315.7%1,57984.3%
17.Ocn2,40744318.4%1,96481.6%
18.K-opticom621219.4%5080.6%
19.STNet5120.0%480.0%
20.Japan Network Information Center1442920.1%11579.9%
21.Zaq19421.1%1578.9%
22.Bbix1,42830421.3%1,12478.7%
23.NTT Communications Corporation37821.6%2978.4%
24.Choopa1663722.3%12977.7%
25.Hurricane Electric LLC952526.3%7073.7%

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 (Nov 2019)

  ISP Test count IPv6 average
1.K-opticom6257.0 Mbps
2.Mediacat551.0 Mbps
3.Jupiter Telecommunication Co. Ltd3441.0 Mbps
4.Choopa, LLC7936.6 Mbps
5.So-net Entertainment Corporation18034.3 Mbps
6.Linode7631.3 Mbps
7.its communications Inc.1129.2 Mbps
8.Japan Network Information Center14426.7 Mbps
9.NTT Communications Corporation3725.3 Mbps
10.Asahi68422.8 Mbps
11.Kir722.0 Mbps
12.Sakura3121.9 Mbps
13.Mf-native61,87221.9 Mbps
14.Japan Network Information Center, Internet Initiative Japan Inc.18820.9 Mbps
15.Zaq1920.8 Mbps
16.Biglobe1,12820.0 Mbps
17.Jpne3,20519.2 Mbps
18.Choopa16618.9 Mbps
19.Ocn2,40718.8 Mbps
20.InfoSphere2718.3 Mbps
21.KDDI Corporation4018.2 Mbps
22.Hurricane Electric LLC9517.1 Mbps
23.Bbix1,42816.7 Mbps
24.Internet Multifeed Co.1,01915.7 Mbps
25.Chubu Telecommunications Company, Inc.2914.0 Mbps