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 2020)

	ISP	IPv6 tests count
1.	Ocn	3,146
2.	Jpne	3,119
3.	Mf-native6	2,966
4.	Bbix	1,563
5.	Asahi	991
6.	Internet Multifeed Co.	816
7.	Biglobe	782
8.	Japan Network Information Center	769
9.	So-net Entertainment Corporation	748
10.	Kddi	470
11.	Softbank BB Corp.	180
12.	Japan Network Information Center, Internet Initiative Japan Inc.	157
13.	KDDI Corporation	147
14.	Choopa	104
15.	Chubu Telecommunications Company, Inc.	103
16.	K-opticom	99
17.	Hurricane Electric LLC	91
18.	NTT Communications Corporation	36
19.	InfoSphere	35
20.	China Mobile communications corporation	32
21.	Jupiter Telecommunication Co. Ltd	29
22.	Linode	28
23.	NTTDoCoMo	26
24.	its communications Inc.	25
25.	China Next Generation Internet CERNET2	25

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 2020)

	ISP	Unique IPv6 addresses
1.	Jpne	2,065
2.	Ocn	1,986
3.	Mf-native6	1,480
4.	Bbix	994
5.	Internet Multifeed Co.	517
6.	Asahi	516
7.	Biglobe	510
8.	Japan Network Information Center	363
9.	So-net Entertainment Corporation	352
10.	Kddi	268
11.	Softbank BB Corp.	115
12.	Japan Network Information Center, Internet Initiative Japan Inc.	108
13.	KDDI Corporation	96
14.	K-opticom	66
15.	Chubu Telecommunications Company, Inc.	44
16.	Hurricane Electric LLC	38
17.	Choopa	29
18.	NTT Communications Corporation	27
19.	Linode	23
20.	NTTDoCoMo	22
21.	its communications Inc.	20
22.	China Mobile communications corporation	17
23.	Jupiter Telecommunication Co. Ltd	17
24.	Tokai	17
25.	InfoSphere	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.

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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 2020)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	i3D.net B.V. Tokyo Japan	17	0	0.0%	17	100.0%
2.	Zaq	12	0	0.0%	12	100.0%
3.	xTom Limited	5	0	0.0%	5	100.0%
4.	K-opticom	99	5	5.1%	94	94.9%
5.	NTT Communications Corporation	36	2	5.6%	34	94.4%
6.	China Next Generation Internet CERNET2	25	2	8.0%	23	92.0%
7.	Chubu Telecommunications Company, Inc.	103	9	8.7%	94	91.3%
8.	STNet	11	1	9.1%	10	90.9%
9.	Energia Communications	22	2	9.1%	20	90.9%
10.	KDDI Corporation	147	14	9.5%	133	90.5%
11.	Biglobe	782	77	9.8%	705	90.2%
12.	Kddi	470	57	12.1%	413	87.9%
13.	Jpne	3,119	385	12.3%	2,734	87.7%
14.	Asahi	991	147	14.8%	844	85.2%
15.	Japan Network Information Center	769	118	15.3%	651	84.7%
16.	Ocn	3,146	528	16.8%	2,618	83.2%
17.	Mf-native6	2,966	507	17.1%	2,459	82.9%
18.	Suzuka Cable Co., Ltd	10	2	20.0%	8	80.0%
19.	Internet Multifeed Co.	816	169	20.7%	647	79.3%
20.	So-net Entertainment Corporation	748	162	21.7%	586	78.3%
21.	Tokai	23	5	21.7%	18	78.3%
22.	Bbix	1,563	343	21.9%	1,220	78.1%
23.	its communications Inc.	25	6	24.0%	19	76.0%
24.	Choopa	104	29	27.9%	75	72.1%
25.	Hurricane Electric LLC	91	27	29.7%	64	70.3%

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 (Oct 2020)

	ISP	Test count	IPv6 average
1.	Zaq	12	86.7 Mbps
2.	Asahi	991	44.6 Mbps
3.	NTT Communications Corporation	36	42.2 Mbps
4.	Jupiter Telecommunication Co. Ltd	29	40.0 Mbps
5.	Chubu Telecommunications Company, Inc.	103	37.3 Mbps
6.	Linode	28	34.5 Mbps
7.	Japan Network Information Center	769	32.9 Mbps
8.	So-net Entertainment Corporation	748	31.3 Mbps
9.	KDDI Corporation	147	28.5 Mbps
10.	Jpne	3,119	27.3 Mbps
11.	Mf-native6	2,966	25.7 Mbps
12.	Kddi	470	24.7 Mbps
13.	Ocn	3,146	24.5 Mbps
14.	Biglobe	782	22.7 Mbps
15.	Choopa	104	21.9 Mbps
16.	Bbix	1,563	21.5 Mbps
17.	K-opticom	99	18.4 Mbps
18.	Hurricane Electric LLC	91	16.6 Mbps
19.	NTTDoCoMo	26	15.6 Mbps
20.	Internet Multifeed Co.	816	13.2 Mbps
21.	Japan Network Information Center, Internet Initiative Japan Inc.	157	13.0 Mbps
22.	Softbank BB Corp.	180	12.6 Mbps
23.	xTom Limited	5	11.1 Mbps
24.	Choopa, LLC	8	8.9 Mbps
25.	its communications Inc.	25	8.3 Mbps

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