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 (Dec 2019)

	ISP	IPv6 tests count
1.	Jpne	3,316
2.	Ocn	2,910
3.	Mf-native6	2,521
4.	Biglobe	1,349
5.	Bbix	1,198
6.	Internet Multifeed Co.	1,135
7.	Asahi	391
8.	Kddi	283
9.	So-net Entertainment Corporation	273
10.	InfoSphere	230
11.	Hurricane Electric LLC	206
12.	Softbank BB Corp.	184
13.	Japan Network Information Center, Internet Initiative Japan Inc.	177
14.	Japan Network Information Center	164
15.	Choopa, LLC	109
16.	Choopa	102
17.	Jupiter Telecommunication Co. Ltd	86
18.	NTT Communications Corporation	59
19.	Linode	55
20.	K-opticom	53
21.	M247 Ltd	34
22.	China Mobile communications corporation	31
23.	Chubu Telecommunications Company, Inc.	27
24.	NTTDoCoMo	26
25.	KDDI Corporation	24

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, Dec 2019)

	ISP	Unique IPv6 addresses
1.	Jpne	2,129
2.	Ocn	1,780
3.	Mf-native6	1,549
4.	Biglobe	934
5.	Bbix	741
6.	Internet Multifeed Co.	663
7.	Asahi	261
8.	So-net Entertainment Corporation	194
9.	Kddi	193
10.	Softbank BB Corp.	147
11.	Japan Network Information Center, Internet Initiative Japan Inc.	135
12.	Japan Network Information Center	113
13.	InfoSphere	91
14.	Hurricane Electric LLC	77
15.	Choopa	55
16.	K-opticom	42
17.	NTT Communications Corporation	39
18.	Linode	29
19.	Jupiter Telecommunication Co. Ltd	25
20.	NTTDoCoMo	23
21.	Chubu Telecommunications Company, Inc.	20
22.	M247 Ltd	19
23.	Choopa, LLC	19
24.	KDDI Corporation	18
25.	Cloudflarewarp	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 (Dec 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	i3D.net B.V. Tokyo Japan	6	0	0.0%	6	100.0%
2.	Sony Computer Entertainment Inc, 1-7-1, Konan, Minato-ku, Tokyo 108-0075, Japan	5	0	0.0%	5	100.0%
3.	Fcc	11	0	0.0%	11	100.0%
4.	Tokai	8	0	0.0%	8	100.0%
5.	Chubu Telecommunications Company, Inc.	27	2	7.4%	25	92.6%
6.	its communications Inc.	12	1	8.3%	11	91.7%
7.	NTT Communications Corporation	59	5	8.5%	54	91.5%
8.	NTTDoCoMo	26	3	11.5%	23	88.5%
9.	Jpne	3,316	409	12.3%	2,907	87.7%
10.	Mf-native6	2,521	341	13.5%	2,180	86.5%
11.	Biglobe	1,349	183	13.6%	1,166	86.4%
12.	STNet	7	1	14.3%	6	85.7%
13.	NTT PC Communications, Inc.	7	1	14.3%	6	85.7%
14.	Ocn	2,910	446	15.3%	2,464	84.7%
15.	So-net Entertainment Corporation	273	44	16.1%	229	83.9%
16.	KDDI Corporation	24	4	16.7%	20	83.3%
17.	K-opticom	53	9	17.0%	44	83.0%
18.	Bbix	1,198	216	18.0%	982	82.0%
19.	Hurricane Electric LLC	206	39	18.9%	167	81.1%
20.	Zaq	21	4	19.0%	17	81.0%
21.	Japan Network Information Center	164	33	20.1%	131	79.9%
22.	Kddi	283	58	20.5%	225	79.5%
23.	Choopa	102	21	20.6%	81	79.4%
24.	Asahi	391	81	20.7%	310	79.3%
25.	InfoSphere	230	54	23.5%	176	76.5%

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 (Dec 2019)

	ISP	Test count	IPv6 average
1.	Zaq	21	94.7 Mbps
2.	Jupiter Telecommunication Co. Ltd	86	87.2 Mbps
3.	Choopa	102	35.0 Mbps
4.	So-net Entertainment Corporation	273	34.2 Mbps
5.	its communications Inc.	12	27.6 Mbps
6.	Linode	55	26.4 Mbps
7.	K-opticom	53	24.0 Mbps
8.	Ocn	2,910	23.8 Mbps
9.	Choopa, LLC	109	23.0 Mbps
10.	Biglobe	1,349	20.7 Mbps
11.	Jpne	3,316	20.7 Mbps
12.	NTT Communications Corporation	59	20.1 Mbps
13.	Chubu Telecommunications Company, Inc.	27	20.0 Mbps
14.	Mf-native6	2,521	19.6 Mbps
15.	Asahi	391	18.9 Mbps
16.	M247 Ltd	34	18.3 Mbps
17.	Japan Network Information Center	164	18.0 Mbps
18.	Kddi	283	17.6 Mbps
19.	Bbix	1,198	15.5 Mbps
20.	InfoSphere	230	14.9 Mbps
21.	Hurricane Electric LLC	206	14.2 Mbps
22.	Internet Multifeed Co.	1,135	12.5 Mbps
23.	Wide	14	10.2 Mbps
24.	Japan Network Information Center, Internet Initiative Japan Inc.	177	9.0 Mbps
25.	Softbank BB Corp.	184	7.3 Mbps