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 (Jul 2020)

  ISP IPv6 tests count
1.Jpne3,840
2.Ocn3,532
3.Mf-native63,300
4.Bbix2,125
5.Internet Multifeed Co.1,480
6.Biglobe1,354
7.Japan Network Information Center1,206
8.Asahi873
9.Kddi386
10.Softbank BB Corp.335
11.So-net Entertainment Corporation332
12.Japan Network Information Center, Internet Initiative Japan Inc.269
13.Hurricane Electric LLC210
14.K-opticom161
15.KDDI Corporation156
16.Jupiter Telecommunication Co. Ltd66
17.NTT Communications Corporation60
18.Choopa57
19.Chubu Telecommunications Company, Inc.52
20.M247 Ltd40
21.InfoSphere39
22.its communications Inc.32
23.NTTDoCoMo32
24.Internet Assigned Numbers Authority30
25.Linode21

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, Jul 2020)

  ISP Unique IPv6 addresses
1.Jpne2,433
2.Ocn2,201
3.Mf-native61,923
4.Bbix1,192
5.Internet Multifeed Co.947
6.Biglobe853
7.Asahi555
8.Japan Network Information Center533
9.Kddi273
10.Softbank BB Corp.235
11.So-net Entertainment Corporation208
12.Japan Network Information Center, Internet Initiative Japan Inc.199
13.KDDI Corporation109
14.Hurricane Electric LLC105
15.K-opticom61
16.NTT Communications Corporation34
17.Chubu Telecommunications Company, Inc.29
18.InfoSphere27
19.Jupiter Telecommunication Co. Ltd25
20.NTTDoCoMo23
21.its communications Inc.22
22.Choopa22
23.Ultina15
24.M247 Ltd14
25.LCV Corporation13

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 (Jul 2020)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.American Registry Internet Numbers1500.0%15100.0%
2.LCV Corporation1400.0%14100.0%
3.Ultina1500.0%15100.0%
4.Internet Assigned Numbers Authority3000.0%30100.0%
5.Hinet Twnic600.0%6100.0%
6.K-opticom161127.5%14992.5%
7.NTT Communications Corporation6058.3%5591.7%
8.Chubu Telecommunications Company, Inc.5259.6%4790.4%
9.Cat Networks K.K.10110.0%990.0%
10.Biglobe1,35413610.0%1,21890.0%
11.STNet9111.1%888.9%
12.KDDI Corporation1561811.5%13888.5%
13.Ocn3,53242612.1%3,10687.9%
14.Kir8112.5%787.5%
15.Japan Network Information Center1,20615612.9%1,05087.1%
16.Zaq15213.3%1386.7%
17.Jpne3,84052613.7%3,31486.3%
18.Mf-native63,30048414.7%2,81685.3%
19.Softbank BB Corp.3355014.9%28585.1%
20.Asahi87313115.0%74285.0%
21.NTTDoCoMo32515.6%2784.4%
22.Internet Multifeed Co.1,48024716.7%1,23383.3%
23.Energia Communications17317.6%1482.4%
24.Kddi3866917.9%31782.1%
25.its communications Inc.32618.8%2681.3%

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 (Jul 2020)

  ISP Test count IPv6 average
1.Zaq1541.9 Mbps
2.Choopa, LLC941.7 Mbps
3.Jupiter Telecommunication Co. Ltd6636.2 Mbps
4.Linode2133.8 Mbps
5.So-net Entertainment Corporation33231.3 Mbps
6.Tokai929.0 Mbps
7.Asahi87328.6 Mbps
8.Softbank BB Corp.33528.5 Mbps
9.Choopa5727.3 Mbps
10.Mf-native63,30025.0 Mbps
11.M247 Ltd4025.0 Mbps
12.Biglobe1,35424.1 Mbps
13.Chubu Telecommunications Company, Inc.5222.1 Mbps
14.Ocn3,53221.4 Mbps
15.Jpne3,84021.2 Mbps
16.K-opticom16120.6 Mbps
17.Bbix2,12520.2 Mbps
18.Hurricane Electric LLC21016.7 Mbps
19.Internet Multifeed Co.1,48016.2 Mbps
20.InfoSphere3915.0 Mbps
21.Japan Network Information Center1,20613.7 Mbps
22.Kddi38613.4 Mbps
23.NTT Communications Corporation609.8 Mbps
24.KDDI Corporation1569.8 Mbps
25.Japan Network Information Center, Internet Initiative Japan Inc.2699.3 Mbps