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 (Nov 2023)

	ISP	IPv6 tests count
1.	ASAHI Net, Inc.	2,589
2.	Jpne	1,911
3.	Internet Multifeed Co.	1,564
4.	NTT Communications Corporation	1,403
5.	Bbix	721
6.	Japan Network Information Center	677
7.	BIGLOBE Inc.	650
8.	KDDI Corporation	291
9.	Sony Network Communications Inc.	224
10.	Cloudflare, Inc.	188
11.	Rakuten Mobile	139
12.	xTom Limited	108
13.	Ntt Docomo, Inc.	87
14.	Hurricane Electric LLC	80
15.	Amazon.com, Inc.	71
16.	Softbank BB Corp.	68
17.	Internet Initiative Japan	64
18.	Google, LLC	63
19.	OPTAGE Inc.	51
20.	M247 Europe SRL	44
21.	Nearoute Limited	44
22.	NTT PC Communications, Inc.	40
23.	Datacamp Limited	36
24.	Chubu Telecommunications Company, Inc.	35
25.	The Constant Company	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, Nov 2023)

	ISP	Unique IPv6 addresses
1.	Jpne	1,210
2.	NTT Communications Corporation	949
3.	Internet Multifeed Co.	935
4.	ASAHI Net, Inc.	497
5.	Bbix	483
6.	Japan Network Information Center	445
7.	BIGLOBE Inc.	405
8.	KDDI Corporation	199
9.	Sony Network Communications Inc.	139
10.	Cloudflare, Inc.	132
11.	Rakuten Mobile	118
12.	Ntt Docomo, Inc.	75
13.	Softbank BB Corp.	54
14.	Internet Initiative Japan	46
15.	Hurricane Electric LLC	44
16.	OPTAGE Inc.	41
17.	Google, LLC	41
18.	Amazon.com, Inc.	39
19.	Chubu Telecommunications Company, Inc.	27
20.	NTT PC Communications, Inc.	25
21.	Akamai Technologies	19
22.	xTom Limited	18
23.	Owl Limited	18
24.	China Unicom Network	18
25.	Nearoute Limited	16

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 (Nov 2023)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Research Organization of Information and Systems, National Institute of Informa	10	0	0.0%	10	100.0%
2.	Akamai Technologies, Inc.	8	0	0.0%	8	100.0%
3.	Tdnc	6	0	0.0%	6	100.0%
4.	TOKAI Communications Corporation	23	0	0.0%	23	100.0%
5.	Research Organization of Information and Systems, National Institute of Informatics	7	0	0.0%	7	100.0%
6.	Internet Society	5	0	0.0%	5	100.0%
7.	Suzuka Cable Co., Ltd	7	0	0.0%	7	100.0%
8.	Datacamp Limited	36	0	0.0%	36	100.0%
9.	Sony Global Solutions Inc.	7	0	0.0%	7	100.0%
10.	Microsoft Corporation	7	0	0.0%	7	100.0%
11.	GLBB Japan KK	20	0	0.0%	20	100.0%
12.	ASAHI Net, Inc.	2,589	44	1.7%	2,545	98.3%
13.	Rakuten Mobile	139	10	7.2%	129	92.8%
14.	BIGLOBE Inc.	650	47	7.2%	603	92.8%
15.	Sony Network Communications Inc.	224	18	8.0%	206	92.0%
16.	Ntt Docomo, Inc.	87	7	8.0%	80	92.0%
17.	The Constant Company, LLC	12	1	8.3%	11	91.7%
18.	Internet Multifeed Co.	1,564	133	8.5%	1,431	91.5%
19.	Chubu Telecommunications Company, Inc.	35	3	8.6%	32	91.4%
20.	Japan Network Information Center	677	62	9.2%	615	90.8%
21.	Jpne	1,911	179	9.4%	1,732	90.6%
22.	KDDI Corporation	291	28	9.6%	263	90.4%
23.	STNet, Incorporated	10	1	10.0%	9	90.0%
24.	Bbix	721	76	10.5%	645	89.5%
25.	Nearoute Limited	44	5	11.4%	39	88.6%

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 (Nov 2023)

	ISP	Test count	IPv6 average
1.	Cat Networks K.K	5	96.1 Mbps
2.	Owl Limited	23	86.2 Mbps
3.	Cloudflare, Inc.	188	74.9 Mbps
4.	Amazon.com, Inc.	71	59.5 Mbps
5.	Nearoute Limited	44	57.2 Mbps
6.	Chubu Telecommunications Company, Inc.	35	47.0 Mbps
7.	Akamai Technologies	22	44.5 Mbps
8.	Research Organization of Information and Systems, National Institute of Informa	10	37.1 Mbps
9.	BIGLOBE Inc.	650	32.6 Mbps
10.	OPTAGE Inc.	51	30.8 Mbps
11.	SAKURA Internet Inc.	15	30.3 Mbps
12.	Rakuten Mobile	139	19.8 Mbps
13.	Sony Network Communications Inc.	224	17.4 Mbps
14.	Jpne	1,911	17.4 Mbps
15.	Bbix	721	16.7 Mbps
16.	Hurricane Electric LLC	80	15.8 Mbps
17.	Japan Network Information Center	677	13.8 Mbps
18.	NTT Communications Corporation	1,403	13.0 Mbps
19.	NTT PC Communications, Inc.	40	11.7 Mbps
20.	ASAHI Net, Inc.	2,589	11.5 Mbps
21.	KDDI Corporation	291	11.1 Mbps
22.	Internet Multifeed Co.	1,564	9.6 Mbps
23.	Google, LLC	63	7.4 Mbps
24.	TOKAI Communications Corporation	23	6.9 Mbps
25.	xTom Limited	108	3.5 Mbps

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