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 (Oct 2019)

	ISP	IPv6 tests count
1.	Jpne	3,720
2.	Mf-native6	2,817
3.	Ocn	2,535
4.	Bbix	1,483
5.	Biglobe	1,290
6.	Internet Multifeed Co.	1,170
7.	Asahi	372
8.	Softbank BB Corp.	343
9.	Japan Network Information Center	257
10.	Kddi	248
11.	Hurricane Electric LLC	185
12.	So-net Entertainment Corporation	183
13.	Japan Network Information Center, Internet Initiative Japan Inc.	155
14.	Choopa	102
15.	NTT Communications Corporation	68
16.	i3D.net B.V. Tokyo Japan	60
17.	Jupiter Telecommunication Co. Ltd	59
18.	Nct	48
19.	InfoSphere	48
20.	NTTDoCoMo	47
21.	K-opticom	45
22.	Linode	43
23.	Choopa, LLC	38
24.	M247 Ltd	36
25.	Chubu Telecommunications Company, Inc.	33

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 2019)

	ISP	Unique IPv6 addresses
1.	Jpne	2,317
2.	Ocn	1,649
3.	Mf-native6	1,617
4.	Bbix	866
5.	Biglobe	862
6.	Internet Multifeed Co.	770
7.	Asahi	239
8.	Softbank BB Corp.	228
9.	Kddi	176
10.	Japan Network Information Center	175
11.	Japan Network Information Center, Internet Initiative Japan Inc.	118
12.	So-net Entertainment Corporation	103
13.	Hurricane Electric LLC	95
14.	NTT Communications Corporation	44
15.	Choopa	42
16.	NTTDoCoMo	41
17.	K-opticom	34
18.	InfoSphere	31
19.	Linode	29
20.	Jupiter Telecommunication Co. Ltd	24
21.	Chubu Telecommunications Company, Inc.	24
22.	M247 Ltd	19
23.	Tokai	16
24.	Cat Networks K.K.	15
25.	Choopa, LLC	15

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 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	STNet	8	0	0.0%	8	100.0%
2.	Nct	48	0	0.0%	48	100.0%
3.	Tokyo Institute of Technology	9	0	0.0%	9	100.0%
4.	i3D.net B.V. Tokyo Japan	60	0	0.0%	60	100.0%
5.	Fcc	7	0	0.0%	7	100.0%
6.	Sakura	27	1	3.7%	26	96.3%
7.	KDDI Corporation	12	1	8.3%	11	91.7%
8.	Jpne	3,720	450	12.1%	3,270	87.9%
9.	Mf-native6	2,817	349	12.4%	2,468	87.6%
10.	Kddi	248	31	12.5%	217	87.5%
11.	Asahi	372	50	13.4%	322	86.6%
12.	Internet Multifeed Co.	1,170	159	13.6%	1,011	86.4%
13.	Tokai	28	4	14.3%	24	85.7%
14.	Chubu Telecommunications Company, Inc.	33	5	15.2%	28	84.8%
15.	Biglobe	1,290	196	15.2%	1,094	84.8%
16.	NTT Communications Corporation	68	11	16.2%	57	83.8%
17.	Bbix	1,483	258	17.4%	1,225	82.6%
18.	Ocn	2,535	456	18.0%	2,079	82.0%
19.	So-net Entertainment Corporation	183	33	18.0%	150	82.0%
20.	Hokuden Information System Service Co., Ltd.	21	4	19.0%	17	81.0%
21.	K-opticom	45	10	22.2%	35	77.8%
22.	Softbank BB Corp.	343	85	24.8%	258	75.2%
23.	interQ	11	3	27.3%	8	72.7%
24.	Choopa	102	28	27.5%	74	72.5%
25.	Zaq	16	5	31.3%	11	68.8%

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 2019)

	ISP	Test count	IPv6 average
1.	Jupiter Telecommunication Co. Ltd	59	66.3 Mbps
2.	NTT Communications Corporation	68	36.8 Mbps
3.	Zaq	16	34.2 Mbps
4.	Amazon Technologies Inc	23	33.9 Mbps
5.	Choopa, LLC	38	31.6 Mbps
6.	Tokyo Institute of Technology	9	30.3 Mbps
7.	K-opticom	45	29.7 Mbps
8.	So-net Entertainment Corporation	183	25.6 Mbps
9.	Japan Network Information Center	257	25.1 Mbps
10.	Asahi	372	24.5 Mbps
11.	Biglobe	1,290	22.7 Mbps
12.	Jpne	3,720	21.2 Mbps
13.	Bbix	1,483	18.9 Mbps
14.	Ocn	2,535	18.8 Mbps
15.	Japan Network Information Center, Internet Initiative Japan Inc.	155	17.4 Mbps
16.	Choopa	102	16.2 Mbps
17.	Chubu Telecommunications Company, Inc.	33	16.1 Mbps
18.	Mf-native6	2,817	13.6 Mbps
19.	Kddi	248	13.4 Mbps
20.	Ncv	23	13.2 Mbps
21.	Sakura-ishikari	15	12.8 Mbps
22.	Internet Multifeed Co.	1,170	12.6 Mbps
23.	Tokai	28	9.5 Mbps
24.	Hurricane Electric LLC	185	6.9 Mbps
25.	InfoSphere	48	5.5 Mbps