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 (Oct 2020)

  ISP IPv6 tests count
1.Ocn3,146
2.Jpne3,119
3.Mf-native62,966
4.Bbix1,563
5.Asahi991
6.Internet Multifeed Co.816
7.Biglobe782
8.Japan Network Information Center769
9.So-net Entertainment Corporation748
10.Kddi470
11.Softbank BB Corp.180
12.Japan Network Information Center, Internet Initiative Japan Inc.157
13.KDDI Corporation147
14.Choopa104
15.Chubu Telecommunications Company, Inc.103
16.K-opticom99
17.Hurricane Electric LLC91
18.NTT Communications Corporation36
19.InfoSphere35
20.China Mobile communications corporation32
21.Jupiter Telecommunication Co. Ltd29
22.Linode28
23.NTTDoCoMo26
24.its communications Inc.25
25.China Next Generation Internet CERNET225

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, Oct 2020)

  ISP Unique IPv6 addresses
1.Jpne2,065
2.Ocn1,986
3.Mf-native61,480
4.Bbix994
5.Internet Multifeed Co.517
6.Asahi516
7.Biglobe510
8.Japan Network Information Center363
9.So-net Entertainment Corporation352
10.Kddi268
11.Softbank BB Corp.115
12.Japan Network Information Center, Internet Initiative Japan Inc.108
13.KDDI Corporation96
14.K-opticom66
15.Chubu Telecommunications Company, Inc.44
16.Hurricane Electric LLC38
17.Choopa29
18.NTT Communications Corporation27
19.Linode23
20.NTTDoCoMo22
21.its communications Inc.20
22.China Mobile communications corporation17
23.Jupiter Telecommunication Co. Ltd17
24.Tokai17
25.InfoSphere15

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 (Oct 2020)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.i3D.net B.V. Tokyo Japan1700.0%17100.0%
2.Zaq1200.0%12100.0%
3.xTom Limited500.0%5100.0%
4.K-opticom9955.1%9494.9%
5.NTT Communications Corporation3625.6%3494.4%
6.China Next Generation Internet CERNET22528.0%2392.0%
7.Chubu Telecommunications Company, Inc.10398.7%9491.3%
8.STNet1119.1%1090.9%
9.Energia Communications2229.1%2090.9%
10.KDDI Corporation147149.5%13390.5%
11.Biglobe782779.8%70590.2%
12.Kddi4705712.1%41387.9%
13.Jpne3,11938512.3%2,73487.7%
14.Asahi99114714.8%84485.2%
15.Japan Network Information Center76911815.3%65184.7%
16.Ocn3,14652816.8%2,61883.2%
17.Mf-native62,96650717.1%2,45982.9%
18.Suzuka Cable Co., Ltd10220.0%880.0%
19.Internet Multifeed Co.81616920.7%64779.3%
20.So-net Entertainment Corporation74816221.7%58678.3%
21.Tokai23521.7%1878.3%
22.Bbix1,56334321.9%1,22078.1%
23.its communications Inc.25624.0%1976.0%
24.Choopa1042927.9%7572.1%
25.Hurricane Electric LLC912729.7%6470.3%

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 (Oct 2020)

  ISP Test count IPv6 average
1.Zaq1286.7 Mbps
2.Asahi99144.6 Mbps
3.NTT Communications Corporation3642.2 Mbps
4.Jupiter Telecommunication Co. Ltd2940.0 Mbps
5.Chubu Telecommunications Company, Inc.10337.3 Mbps
6.Linode2834.5 Mbps
7.Japan Network Information Center76932.9 Mbps
8.So-net Entertainment Corporation74831.3 Mbps
9.KDDI Corporation14728.5 Mbps
10.Jpne3,11927.3 Mbps
11.Mf-native62,96625.7 Mbps
12.Kddi47024.7 Mbps
13.Ocn3,14624.5 Mbps
14.Biglobe78222.7 Mbps
15.Choopa10421.9 Mbps
16.Bbix1,56321.5 Mbps
17.K-opticom9918.4 Mbps
18.Hurricane Electric LLC9116.6 Mbps
19.NTTDoCoMo2615.6 Mbps
20.Internet Multifeed Co.81613.2 Mbps
21.Japan Network Information Center, Internet Initiative Japan Inc.15713.0 Mbps
22.Softbank BB Corp.18012.6 Mbps
23.xTom Limited511.1 Mbps
24.Choopa, LLC88.9 Mbps
25.its communications Inc.258.3 Mbps