IPv6 test - Statistics for 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.	Jpne	3,840
2.	Ocn	3,532
3.	Mf-native6	3,300
4.	Bbix	2,125
5.	Internet Multifeed Co.	1,480
6.	Biglobe	1,354
7.	Japan Network Information Center	1,206
8.	Asahi	873
9.	Kddi	386
10.	Softbank BB Corp.	335
11.	So-net Entertainment Corporation	332
12.	Japan Network Information Center, Internet Initiative Japan Inc.	269
13.	Hurricane Electric LLC	210
14.	K-opticom	161
15.	KDDI Corporation	156
16.	Jupiter Telecommunication Co. Ltd	66
17.	NTT Communications Corporation	60
18.	Choopa	57
19.	Chubu Telecommunications Company, Inc.	52
20.	M247 Ltd	40
21.	InfoSphere	39
22.	its communications Inc.	32
23.	NTTDoCoMo	32
24.	Internet Assigned Numbers Authority	30
25.	Linode	21

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.	Jpne	2,433
2.	Ocn	2,201
3.	Mf-native6	1,923
4.	Bbix	1,192
5.	Internet Multifeed Co.	947
6.	Biglobe	853
7.	Asahi	555
8.	Japan Network Information Center	533
9.	Kddi	273
10.	Softbank BB Corp.	235
11.	So-net Entertainment Corporation	208
12.	Japan Network Information Center, Internet Initiative Japan Inc.	199
13.	KDDI Corporation	109
14.	Hurricane Electric LLC	105
15.	K-opticom	61
16.	NTT Communications Corporation	34
17.	Chubu Telecommunications Company, Inc.	29
18.	InfoSphere	27
19.	Jupiter Telecommunication Co. Ltd	25
20.	NTTDoCoMo	23
21.	its communications Inc.	22
22.	Choopa	22
23.	Ultina	15
24.	M247 Ltd	14
25.	LCV Corporation	13

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 Numbers	15	0	0.0%	15	100.0%
2.	LCV Corporation	14	0	0.0%	14	100.0%
3.	Ultina	15	0	0.0%	15	100.0%
4.	Internet Assigned Numbers Authority	30	0	0.0%	30	100.0%
5.	Hinet Twnic	6	0	0.0%	6	100.0%
6.	K-opticom	161	12	7.5%	149	92.5%
7.	NTT Communications Corporation	60	5	8.3%	55	91.7%
8.	Chubu Telecommunications Company, Inc.	52	5	9.6%	47	90.4%
9.	Cat Networks K.K.	10	1	10.0%	9	90.0%
10.	Biglobe	1,354	136	10.0%	1,218	90.0%
11.	STNet	9	1	11.1%	8	88.9%
12.	KDDI Corporation	156	18	11.5%	138	88.5%
13.	Ocn	3,532	426	12.1%	3,106	87.9%
14.	Kir	8	1	12.5%	7	87.5%
15.	Japan Network Information Center	1,206	156	12.9%	1,050	87.1%
16.	Zaq	15	2	13.3%	13	86.7%
17.	Jpne	3,840	526	13.7%	3,314	86.3%
18.	Mf-native6	3,300	484	14.7%	2,816	85.3%
19.	Softbank BB Corp.	335	50	14.9%	285	85.1%
20.	Asahi	873	131	15.0%	742	85.0%
21.	NTTDoCoMo	32	5	15.6%	27	84.4%
22.	Internet Multifeed Co.	1,480	247	16.7%	1,233	83.3%
23.	Energia Communications	17	3	17.6%	14	82.4%
24.	Kddi	386	69	17.9%	317	82.1%
25.	its communications Inc.	32	6	18.8%	26	81.3%

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.	Zaq	15	41.9 Mbps
2.	Choopa, LLC	9	41.7 Mbps
3.	Jupiter Telecommunication Co. Ltd	66	36.2 Mbps
4.	Linode	21	33.8 Mbps
5.	So-net Entertainment Corporation	332	31.3 Mbps
6.	Tokai	9	29.0 Mbps
7.	Asahi	873	28.6 Mbps
8.	Softbank BB Corp.	335	28.5 Mbps
9.	Choopa	57	27.3 Mbps
10.	Mf-native6	3,300	25.0 Mbps
11.	M247 Ltd	40	25.0 Mbps
12.	Biglobe	1,354	24.1 Mbps
13.	Chubu Telecommunications Company, Inc.	52	22.1 Mbps
14.	Ocn	3,532	21.4 Mbps
15.	Jpne	3,840	21.2 Mbps
16.	K-opticom	161	20.6 Mbps
17.	Bbix	2,125	20.2 Mbps
18.	Hurricane Electric LLC	210	16.7 Mbps
19.	Internet Multifeed Co.	1,480	16.2 Mbps
20.	InfoSphere	39	15.0 Mbps
21.	Japan Network Information Center	1,206	13.7 Mbps
22.	Kddi	386	13.4 Mbps
23.	NTT Communications Corporation	60	9.8 Mbps
24.	KDDI Corporation	156	9.8 Mbps
25.	Japan Network Information Center, Internet Initiative Japan Inc.	269	9.3 Mbps