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 (Aug 2019)

	ISP	IPv6 tests count
1.	Jpne	3,961
2.	Ocn	2,358
3.	Mf-native6	1,974
4.	Biglobe	1,575
5.	Bbix	1,344
6.	Internet Multifeed Co.	1,112
7.	Hurricane Electric LLC	670
8.	Asahi	570
9.	Kddi	326
10.	So-net Entertainment Corporation	275
11.	Japan Network Information Center, Internet Initiative Japan Inc.	264
12.	Japan Network Information Center	222
13.	Softbank BB Corp.	159
14.	Choopa	135
15.	InfoSphere	71
16.	K-opticom	71
17.	Jupiter Telecommunication Co. Ltd	63
18.	i3D.net B.V. Tokyo Japan	60
19.	NTT Communications Corporation	53
20.	Chubu Telecommunications Company, Inc.	45
21.	NTTDoCoMo	43
22.	M247 Ltd	43
23.	Linode	43
24.	Sakura	38
25.	Zaq	34

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, Aug 2019)

	ISP	Unique IPv6 addresses
1.	Jpne	2,404
2.	Ocn	1,426
3.	Mf-native6	1,191
4.	Biglobe	999
5.	Bbix	806
6.	Internet Multifeed Co.	728
7.	Asahi	318
8.	Kddi	201
9.	Japan Network Information Center, Internet Initiative Japan Inc.	179
10.	So-net Entertainment Corporation	158
11.	Japan Network Information Center	145
12.	Softbank BB Corp.	95
13.	Hurricane Electric LLC	59
14.	K-opticom	50
15.	Choopa	47
16.	InfoSphere	43
17.	NTTDoCoMo	38
18.	NTT Communications Corporation	37
19.	Chubu Telecommunications Company, Inc.	32
20.	Linode	29
21.	Jupiter Telecommunication Co. Ltd	23
22.	M247 Ltd	23
23.	xTom Limited	21
24.	China Mobile communications corporation	17
25.	Mnet	14

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 (Aug 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Multifeed	6	0	0.0%	6	100.0%
2.	Hokuden Information System Service Co., Ltd.	17	0	0.0%	17	100.0%
3.	Community Network Center Inc.	9	0	0.0%	9	100.0%
4.	Mnet	15	0	0.0%	15	100.0%
5.	Telstra Corporation	15	0	0.0%	15	100.0%
6.	Hurricane Electric LLC	670	18	2.7%	652	97.3%
7.	i3D.net B.V. Tokyo Japan	60	2	3.3%	58	96.7%
8.	Tokai	17	1	5.9%	16	94.1%
9.	its communications Inc.	10	1	10.0%	9	90.0%
10.	STNet	8	1	12.5%	7	87.5%
11.	Japan Network Information Center	222	28	12.6%	194	87.4%
12.	Jpne	3,961	510	12.9%	3,451	87.1%
13.	Chubu Telecommunications Company, Inc.	45	6	13.3%	39	86.7%
14.	Biglobe	1,575	220	14.0%	1,355	86.0%
15.	Bbix	1,344	207	15.4%	1,137	84.6%
16.	Asahi	570	91	16.0%	479	84.0%
17.	So-net Entertainment Corporation	275	44	16.0%	231	84.0%
18.	Ocn	2,358	378	16.0%	1,980	84.0%
19.	Kddi	326	55	16.9%	271	83.1%
20.	Mf-native6	1,974	355	18.0%	1,619	82.0%
21.	Internet Multifeed Co.	1,112	225	20.2%	887	79.8%
22.	Zaq	34	7	20.6%	27	79.4%
23.	K-opticom	71	16	22.5%	55	77.5%
24.	Sakura	38	9	23.7%	29	76.3%
25.	NTTDoCoMo	43	11	25.6%	32	74.4%

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 (Aug 2019)

	ISP	Test count	IPv6 average
1.	Jupiter Telecommunication Co. Ltd	63	58.5 Mbps
2.	Zaq	34	52.4 Mbps
3.	its communications Inc.	10	46.5 Mbps
4.	So-net Entertainment Corporation	275	32.7 Mbps
5.	Mf-native6	1,974	26.6 Mbps
6.	Asahi	570	24.8 Mbps
7.	NTT Communications Corporation	53	24.7 Mbps
8.	Biglobe	1,575	23.3 Mbps
9.	Amazon Technologies Inc	9	22.2 Mbps
10.	Jpne	3,961	22.0 Mbps
11.	Ocn	2,358	21.5 Mbps
12.	interQ	16	20.6 Mbps
13.	KDDI Corporation	29	20.3 Mbps
14.	Japan Network Information Center	222	20.3 Mbps
15.	K-opticom	71	20.2 Mbps
16.	Bbix	1,344	18.5 Mbps
17.	Tokai	17	18.5 Mbps
18.	Chubu Telecommunications Company, Inc.	45	17.4 Mbps
19.	Internet Multifeed Co.	1,112	14.8 Mbps
20.	Kddi	326	14.1 Mbps
21.	xTom Limited	28	13.5 Mbps
22.	M247 Ltd	43	13.0 Mbps
23.	Choopa	135	12.2 Mbps
24.	Japan Network Information Center, Internet Initiative Japan Inc.	264	10.1 Mbps
25.	Softbank BB Corp.	159	8.8 Mbps