Internet Service Providers in Japan

Top 20 organizations with the largest IP allocations in Japan

Japan

Top 20 organizations with the largest IP allocations

Rank	Name	IPv4 addresses	IPv6 /64 networks	AS numbers	Prefixes
	Research Organization of Information and Systems, National Institute of Informa	8,704,960	2³³	1	759
	Jupiter Telecommunication Co. Ltd	4,745,216	2³²	1	183
	Internet Initiative Japan Inc.	3,725,056	1.56 x 2³³	1	198
4	Amazon.com, Inc.	3,686,144	1.06 x 2³²	1	194
5	Pacnet Services (Japan) Corp.	223,168	1.5 x 2³³	4	373
6	NHN Techorus Corp.	128,768	2³²	2	159
7	Yahoo Japan	119,808	2³²	1	6
8	Information Systems Department, Japan Aerospace Exploration Agency	115,200	0	1	17
9	Yahoo Japan Corporation	108,544	0	1	49
10	MITSUI KNOWLEDGE INDUSTRY CO., LTD.	71,680	2³²	1	4
11	Wakayama University	65,536	0	1	1
12	National Institute for Fusion Science	65,536	0	1	1
13	Rakuten Communications K.K.	60,160	2³²	2	14
14	Osaki Computer Engineering Co.Ltd	35,328	2³²	1	7
15	GATEWAY INC	25,344	0	1	47
16	CLARA ONLINE, Inc.	24,576	0	1	11
17	mediatti broadband communications	24,576	0	1	13
18	Ace, Inc.	24,576	0	1	3
19	Ishikawa Computer Center Co.,LTD.	23,552	2³²	1	13
20	UUNET Japan Limited	20,512	2²⁵	1	32