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	8,569,408	2³³	1	733
	Jupiter Telecommunication Co. Ltd	4,745,216	2³²	1	181
	Internet Initiative Japan Inc.	3,789,824	1.56 x 2³³	1	191
4	Amazon.com, Inc.	1,227,776	1.06 x 2³²	1	135
5	Pacnet Services (Japan) Corp.	365,752	1.5 x 2³³	4	5,680
6	NHN Techorus Corp.	127,232	2³²	2	150
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	107,520	0	1	48
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	CLARA ONLINE, Inc.	24,576	2³²	1	12
16	Ace, Inc.	24,576	0	1	3
17	Ishikawa Computer Center Co.,LTD.	23,552	2³²	1	13
18	GATEWAY INC	23,296	0	1	42
19	mediatti broadband communications	20,992	0	1	13
20	UUNET Japan Limited	20,768	2²⁵	1	33