Autonomous Systems (AS) in Japan

AS numbers assigned in Japan (JP), ranked by the number of IPv4 addresses mapped to each AS. Organization names are shown as registered.

Data as of: 2026-10-12

RankAS numberOrganizationIPv4 addresses
101 AS4730 Osaka University 67,584
102 AS55391 INTERNET MULTIFEED CO. 67,584
103 AS55392 INTERNET MULTIFEED CO. 67,584
104 AS17961 mitene internet co., ltd. 67,072
105 AS18268 Naganoken Kyodou Densan Co.Ltd. 67,072
106 AS38634 DWANGO Co.,Ltd. 67,072
107 AS23816 LY Corporation 66,560
108 AS23720 Rakuten Mobile Network, Inc. 66,304
109 AS24261 Mie University 66,304
110 AS150363 SoftEther Corporation 66,304
111 AS131158 Nara Institute of Science and Technology, National University Corporation 66,048
112 AS150359 Cable Television TOYAMA Inc. 66,048
113 AS17932 Japan Advanced Institute of Science and Technology 65,792
114 AS17944 Japan Weather Association 65,792
115 AS2500 WIDE Project 65,536
116 AS2508 Kyushu University
133.5.0.0/16		 65,536
117 AS2513 Japan Science and Technology Agency
160.74.0.0/16		 65,536
118 AS2526 Hitachi, Ltd. IT strategy & Digital Integration Division, Employee Experience Office
133.145.0.0/16		 65,536
119 AS9367 Institute of Science Tokyo
131.112.0.0/16		 65,536
120 AS9591 National Institute for Fusion Science
133.75.0.0/16		 65,536
121 AS9991 Hiroshima Shudo University
150.32.0.0/16		 65,536
122 AS10014 Nihon University
133.43.0.0/16		 65,536
123 AS17510 INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD.
133.158.0.0/16		 65,536
124 AS17512 Japan Airlines Co.,Ltd.
163.211.0.0/16		 65,536
125 AS17523 Aoyama Gakuin University
133.2.0.0/16		 65,536
126 AS17701 Seinan Gakuin University
160.23.0.0/16		 65,536
127 AS17946 Gifu University
133.66.0.0/16		 65,536
128 AS17956 WASEDA University
133.9.0.0/16		 65,536
129 AS17960 University of the Ryukyus
133.13.0.0/16		 65,536
130 AS18087 Toyo University
133.79.0.0/16		 65,536
131 AS18124 Okayama University of Science
150.55.0.0/16		 65,536
132 AS18125 Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat, Ministry of Agriculture, Forestry and Fisheries
150.26.0.0/16		 65,536
133 AS18276 Kansai University
158.217.0.0/16		 65,536
134 AS23615 University of Shizuoka
133.33.0.0/16		 65,536
135 AS23623 Chuo University
133.91.0.0/16		 65,536
136 AS23807 Ritsumeikan University
133.19.0.0/16		 65,536
137 AS24248 Wakayama University
133.42.0.0/16		 65,536
138 AS24254 Kyoto Sangyo University
133.101.0.0/16		 65,536
139 AS24268 National University Corporation Shizuoka University
133.70.0.0/16		 65,536
140 AS24275 TOTO LTD.
157.12.0.0/16		 65,536
141 AS37910 Chubu University
157.110.0.0/16		 65,536
142 AS37919 SEGA SAMMY HOLDINGS INC.
157.109.0.0/16		 65,536
143 AS38641 Osaka Sangyo University
133.64.0.0/16		 65,536
144 AS38654 INES Corporation.
150.39.0.0/16		 65,536
145 AS45685 Rikkyo Gakuin Rikkyo University
150.93.0.0/16		 65,536
146 AS55379 Hosei University
133.25.0.0/16		 65,536
147 AS55380 Kanazawa University
133.28.0.0/16		 65,536
148 AS55390 Tokyo University of Science
133.31.0.0/16		 65,536
149 AS55904 KOGAKUIN University
133.80.0.0/16		 65,536
150 AS58652 Kochi University
133.97.0.0/16		 65,536
151 AS58785 Tohoku Gakuin University
157.118.0.0/16		 65,536
152 AS59104 Soka University
150.37.0.0/16		 65,536
153 AS63777 National Institutes of Natural Sciences National Astronomical Observatory of JAPAN
133.40.0.0/16		 65,536
154 AS131159 Yamagata University
133.24.0.0/16		 65,536
155 AS131161 NEC Corporation
43.222.0.0/16		 65,536
156 AS131897 National University Corporation ,Ehime University
133.71.0.0/16		 65,536
157 AS131919 Meiji University
133.26.0.0/16		 65,536
158 AS131930 Tokyo Broadcasting System Television, Inc.
163.45.0.0/16		 65,536
159 AS131938 NISSAN MOTOR CO.,LTD.
150.63.0.0/16		 65,536
160 AS131981 Takushoku University
133.36.0.0/16		 65,536
161 AS18148 Fukuoka University 65,024
162 AS9593 Nikkei Inc. 64,512
163 AS18128 RIKEN 64,512
164 AS9366 SOLITON-NET 63,744
165 AS17686 ACCELIA 63,488
166 AS59127 Newmedia Corporation 63,488
167 AS2523 Internet Technology Research Consortium 61,952
168 AS131918 SHONAN CABLE NETWORK 61,440
169 AS4711 INTEC Inc. 54,272
170 AS55900 GLBB Japan KK 52,992
171 AS37892 Cable Media WAIWAI Co.,Ltd. 52,224
172 AS23791 LCV Corporation 51,200
173 AS23783 Cable Networks Akita Co.,ltd. 50,944
174 AS55387 Japan Communication Inc. 49,152
175 AS131934 ICC Corporation 49,152
176 AS4677 Marubeni OKI Network Solutions Inc. 48,640
177 AS18068 Dream Wave Shizuoka Co. Ltd. 48,640
178 AS17675 PacketFabric (Japan) Co., Ltd. 47,616
179 AS4680 Mitsubishi Electric Information Network Corporation 47,104
180 AS10019 Matsusaka Cable-TV Station Inc. 47,104
181 AS18278 Cable TV Corporation 47,104
182 AS18282 Tonami System Solutions Co., Ltd. 46,336
183 AS4693 CSK-IT MANAGEMENT CORPORATION 45,056
184 AS9378 JCOM Co., Ltd. 45,056
185 AS10003 Ogaki Cable Television Co.,Inc. 45,056
186 AS18092 Kyushu Tele Communications Company 45,056
187 AS23785 SUN FIELD INTERNET LIMITED 45,056
188 AS18136 JCOM Co., Ltd. 43,008
189 AS59125 FAMILY NET JAPAN INCORPORATED 41,984
190 AS2511 Nippon Telegraph and Telephone Corporation 41,728
191 AS7676 TAM Co., Ltd. 39,680
192 AS7690 Mirai Communication Network Inc. 38,912
193 AS17530 Nihon Network Service Co, .Ltd. 38,912
194 AS18135 BTV CO.,LTD. 38,912
195 AS10001 Mics Network Corporation 36,864
196 AS7682 HOKKAIDO TELECOMMUNICATIONS NETWORK Co., Inc. 35,840
197 AS17955 Densan Co., Ltd. 35,328
198 AS38462 Osaki Computer Engineering Co.Ltd 35,328
199 AS23624 Chukai Television Co,.Ltd. 34,816
200 AS131937 Joetsu Cable Vision 33,280

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