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 (Jun 2019)

	ISP	IPv6 tests count
1.	Jpne	4,677
2.	Ocn	3,141
3.	Mf-native6	2,795
4.	Biglobe	2,090
5.	Bbix	1,949
6.	Internet Multifeed Co.	1,462
7.	Asahi	318
8.	Kddi	306
9.	Softbank BB Corp.	279
10.	Japan Network Information Center	269
11.	So-net Entertainment Corporation	228
12.	Choopa	208
13.	Japan Network Information Center, Internet Initiative Japan Inc.	190
14.	Hurricane Electric LLC	161
15.	InfoSphere	156
16.	Linode	72
17.	NTTDoCoMo	68
18.	i3D.net B.V. Tokyo Japan	55
19.	Chubu Telecommunications Company, Inc.	54
20.	NTT Communications Corporation	54
21.	K-opticom	52
22.	Energia Communications	48
23.	interQ	45
24.	Jupiter Telecommunication Co. Ltd	40
25.	Sakura	35

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, Jun 2019)

	ISP	Unique IPv6 addresses
1.	Jpne	2,870
2.	Ocn	1,983
3.	Mf-native6	1,525
4.	Biglobe	1,173
5.	Bbix	1,093
6.	Internet Multifeed Co.	883
7.	Asahi	206
8.	Japan Network Information Center	175
9.	Kddi	169
10.	So-net Entertainment Corporation	150
11.	Softbank BB Corp.	149
12.	Japan Network Information Center, Internet Initiative Japan Inc.	138
13.	Hurricane Electric LLC	76
14.	InfoSphere	73
15.	Choopa	65
16.	NTT Communications Corporation	42
17.	Linode	41
18.	K-opticom	38
19.	NTTDoCoMo	33
20.	Chubu Telecommunications Company, Inc.	24
21.	Energia Communications	22
22.	xTom Limited	22
23.	Cat Networks K.K.	22
24.	Fcc	19
25.	M247 Ltd	19

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 (Jun 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	STNet	7	0	0.0%	7	100.0%
2.	Multifeed	5	0	0.0%	5	100.0%
3.	Ssd	7	0	0.0%	7	100.0%
4.	i3D.net B.V. Tokyo Japan	55	0	0.0%	55	100.0%
5.	Community Network Center Inc.	17	1	5.9%	16	94.1%
6.	Zaq	16	1	6.3%	15	93.8%
7.	NTTDoCoMo	68	5	7.4%	63	92.6%
8.	Sakura	35	3	8.6%	32	91.4%
9.	Jpne	4,677	577	12.3%	4,100	87.7%
10.	Biglobe	2,090	295	14.1%	1,795	85.9%
11.	Shanghai Huajuan Information Technology Co	7	1	14.3%	6	85.7%
12.	Energia Communications	48	7	14.6%	41	85.4%
13.	Mf-native6	2,795	413	14.8%	2,382	85.2%
14.	Ocn	3,141	516	16.4%	2,625	83.6%
15.	Internet Multifeed Co.	1,462	244	16.7%	1,218	83.3%
16.	Bbix	1,949	326	16.7%	1,623	83.3%
17.	Kddi	306	52	17.0%	254	83.0%
18.	Fcc	23	4	17.4%	19	82.6%
19.	Ipr	5	1	20.0%	4	80.0%
20.	Kir	5	1	20.0%	4	80.0%
21.	NTT Communications Corporation	54	11	20.4%	43	79.6%
22.	Chinanet	19	4	21.1%	15	78.9%
23.	Asahi	318	78	24.5%	240	75.5%
24.	Jupiter Telecommunication Co. Ltd	40	10	25.0%	30	75.0%
25.	Chubu Telecommunications Company, Inc.	54	15	27.8%	39	72.2%

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 (Jun 2019)

	ISP	Test count	IPv6 average
1.	Jupiter Telecommunication Co. Ltd	40	60.5 Mbps
2.	Energia Communications	48	54.8 Mbps
3.	Zaq	16	50.7 Mbps
4.	Amazon Technologies Inc	7	46.7 Mbps
5.	Cat Networks K.K.	33	45.8 Mbps
6.	M247 Ltd	29	34.2 Mbps
7.	Community Network Center Inc.	17	33.5 Mbps
8.	its communications Inc.	14	30.2 Mbps
9.	Kddi	306	26.4 Mbps
10.	Kir	5	24.9 Mbps
11.	Fcc	23	23.9 Mbps
12.	Chubu Telecommunications Company, Inc.	54	22.6 Mbps
13.	Ocn	3,141	21.4 Mbps
14.	Asahi	318	21.2 Mbps
15.	Japan Network Information Center	269	21.2 Mbps
16.	InfoSphere	156	20.9 Mbps
17.	Linode	72	20.9 Mbps
18.	Jpne	4,677	20.6 Mbps
19.	Biglobe	2,090	20.4 Mbps
20.	So-net Entertainment Corporation	228	20.4 Mbps
21.	Mf-native6	2,795	19.9 Mbps
22.	interQ	45	17.1 Mbps
23.	Bbix	1,949	16.5 Mbps
24.	KDDI Corporation	10	16.2 Mbps
25.	NTT Communications Corporation	54	15.2 Mbps