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 (Feb 2023)

	ISP	IPv6 tests count
1.	Jpne	3,373
2.	Internet Multifeed Co.	2,846
3.	BIGLOBE Inc.	2,765
4.	NTT Communications Corporation	2,726
5.	Japan Network Information Center	1,091
6.	ASAHI Net, Inc.	1,028
7.	Bbix	996
8.	Rakuten Mobile	659
9.	KDDI Corporation	609
10.	Sony Network Communications Inc.	543
11.	Internet Initiative Japan Inc.	520
12.	Chubu Telecommunications Co., Inc.	104
13.	Oracle Corporation	103
14.	The Constant Company, LLC	98
15.	Linode, LLC	96
16.	Softbank BB Corp.	95
17.	Cloudflare, Inc.	81
18.	The Constant Company	72
19.	OPTAGE Inc.	70
20.	Chinanet	67
21.	Amazon.com, Inc.	67
22.	Cloudflarewarp	65
23.	Ntt Docomo, Inc.	59
24.	SAKURA Internet Inc.	58
25.	China Unicom Network	52

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, Feb 2023)

	ISP	Unique IPv6 addresses
1.	Jpne	1,837
2.	NTT Communications Corporation	1,735
3.	Internet Multifeed Co.	1,436
4.	BIGLOBE Inc.	814
5.	Japan Network Information Center	745
6.	ASAHI Net, Inc.	631
7.	Bbix	563
8.	Sony Network Communications Inc.	361
9.	KDDI Corporation	349
10.	Rakuten Mobile	322
11.	Internet Initiative Japan Inc.	184
12.	Softbank BB Corp.	78
13.	Chubu Telecommunications Co., Inc.	77
14.	Cloudflare, Inc.	64
15.	OPTAGE Inc.	57
16.	Cloudflarewarp	50
17.	Ntt Docomo, Inc.	50
18.	China Unicom Network	48
19.	Linode, LLC	48
20.	Chinanet	47
21.	Oracle Corporation	44
22.	The Constant Company, LLC	43
23.	Amazon.com, Inc.	37
24.	The Constant Company	35
25.	Akamai Technologies, Inc.	30

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.

@AD_CODE@

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 (Feb 2023)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Sony Global Solutions Inc.	8	0	0.0%	8	100.0%
2.	Aphros Science	9	0	0.0%	9	100.0%
3.	GMO Internet, Inc	5	0	0.0%	5	100.0%
4.	Ntt Docomo, Inc.	59	7	11.9%	52	88.1%
5.	Energia Communications	8	1	12.5%	7	87.5%
6.	Nttpcipv6	7	1	14.3%	6	85.7%
7.	Google, LLC	19	3	15.8%	16	84.2%
8.	Chubu Telecommunications Co., Inc.	104	20	19.2%	84	80.8%
9.	its communications Inc.	14	3	21.4%	11	78.6%
10.	NTT PC Communications, Inc.	23	5	21.7%	18	78.3%
11.	Jcn	23	5	21.7%	18	78.3%
12.	TOKAI Communications Corporation	9	2	22.2%	7	77.8%
13.	STNet, Incorporated	9	2	22.2%	7	77.8%
14.	Asia Pacific Network Information Centre	26	6	23.1%	20	76.9%
15.	Community Network Center Inc.	13	3	23.1%	10	76.9%
16.	NTT Communications Corporation	2,726	656	24.1%	2,070	75.9%
17.	SAKURA Internet Inc.	58	14	24.1%	44	75.9%
18.	The Constant Company, LLC	98	24	24.5%	74	75.5%
19.	Jpne	3,373	840	24.9%	2,533	75.1%
20.	Rakuten Mobile	659	184	27.9%	475	72.1%
21.	Internet Multifeed Co.	2,846	798	28.0%	2,048	72.0%
22.	Sony Network Communications Inc.	543	153	28.2%	390	71.8%
23.	BIGLOBE Inc.	2,765	783	28.3%	1,982	71.7%
24.	Rainbow network limited	7	2	28.6%	5	71.4%
25.	Internet Initiative Japan Inc.	520	149	28.7%	371	71.3%

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 (Feb 2023)

	ISP	Test count	IPv6 average
1.	Aphros Science	9	82.8 Mbps
2.	STNet, Incorporated	9	55.1 Mbps
3.	The Constant Company	72	55.0 Mbps
4.	The Constant Company, LLC	98	50.9 Mbps
5.	Tdnc	6	44.5 Mbps
6.	Oracle Corporation	103	44.3 Mbps
7.	Cloudflare, Inc.	81	42.6 Mbps
8.	Linode, LLC	96	38.2 Mbps
9.	SAKURA Internet Inc.	58	37.0 Mbps
10.	China Telecom	11	35.3 Mbps
11.	NTTDoCoMo	13	33.5 Mbps
12.	Sony Network Communications Inc.	543	22.2 Mbps
13.	OPTAGE Inc.	70	14.5 Mbps
14.	Japan Network Information Center	1,091	14.3 Mbps
15.	KDDI Corporation	609	13.3 Mbps
16.	Internet Multifeed Co.	2,846	12.1 Mbps
17.	Amazon.com, Inc.	67	11.3 Mbps
18.	Jpne	3,373	9.8 Mbps
19.	ASAHI Net, Inc.	1,028	8.8 Mbps
20.	STARCAT CABLE NETWORK Co ., LTD.	10	8.6 Mbps
21.	NTT Communications Corporation	2,726	8.2 Mbps
22.	Bbix	996	7.6 Mbps
23.	Internet Initiative Japan Inc.	520	7.5 Mbps
24.	Rakuten Mobile	659	5.3 Mbps
25.	BIGLOBE Inc.	2,765	3.8 Mbps

@AD_CODE@