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: 2026-10-19

RankAS numberOrganizationIPv4 addresses
301 AS131926 Cable Television Saiki Co. , Ltd. 10,240
302 AS131933 TAMA Television Co., Ltd 10,240
303 AS17689 Hokuden Information Technology,Inc. 9,728
304 AS151375 HimawariTV.Corporation 9,728
305 AS63784 Digital Agency 9,472
306 AS7664 HARENET INC. 9,216
307 AS23775 Tamashima TV Inc. 9,216
308 AS24296 LY Corporation 9,216
309 AS37922 Diversitymedia Co.,Ltd. 9,216
310 AS45677 Isahaya Cable Media Co.,Ltd 9,216
311 AS63798 Industrial Cyber Security Center of Excellence 9,216
312 AS131911 HONJYO CABLE VISION CO., LTD. 9,216
313 AS173 Nippon Telegraph and Telephone Corporation 8,704
314 AS17940 CYBER LINKS Co.,Ltd. 8,704
315 AS37908 KIBI Cable Television Co.,Ltd. 8,704
316 AS45687 Minamikyusyu CableTV Net Inc. 8,704
317 AS55899 irob Ltd. 8,704
318 AS131970 Hikarinet Inc. 8,704
319 AS151387 OMURA CABLE TELEVISION K.K. 8,704
320 AS45691 DODO K.K. 8,448
321 AS7665 Okayama Prefectural Government 8,192
322 AS7678 Prox System Design Inc. 8,192
323 AS7686 JCOM Co., Ltd. 8,192
324 AS9358 OPTAGE Inc.
210.141.128.0/19		 8,192
325 AS17518 Shiojiri City
203.141.192.0/19		 8,192
326 AS17678 Gunma Internet Co,.ltd 8,192
327 AS17694 Deutsche Bank Group, Japan BGP connection
160.83.128.0/19		 8,192
328 AS23619 SMARTVALUE Co.,Ltd. 8,192
329 AS23817 Fujitsu Limited. 8,192
330 AS23822 HAGI Television Co., Ltd. 8,192
331 AS24336 DIGITALBANK, Inc., Regional ISP in Japan
202.143.224.0/19		 8,192
332 AS45689 Convivial Net
202.222.160.0/19		 8,192
333 AS59091 Kanagawa Institute of Technology
163.138.192.0/19		 8,192
334 AS59096 Meiji Gakuin University
202.13.128.0/19		 8,192
335 AS59102 GENES Co., Ltd. 8,192
336 AS63770 Industrial Cyber Security Center of Excellence 8,192
337 AS17977 NF Park Bldg.3F, 9-15, Futaba 2-Chome 7,680
338 AS23827 Azumino Network Community TV 7,680
339 AS131960 MBO holdings Inc. 7,680
340 AS17693 YAMATO SYSTEM DEVELOPMENT CO., LTD. 7,168
341 AS17948 EditNet, Incorporated 7,168
342 AS17505 SoftBank Corp. 6,656
343 AS38638 Ip Core Corporation 6,656
344 AS55376 KCV Communications Co. Ltd. 6,656
345 AS10015 Cyber Wave Japan Co., Ltd. 6,400
346 AS63772 extride inc. 6,400
347 AS138968 rainbow network limited 6,400
348 AS142622 Dream Information Laboratory 6,400
349 AS146969 SoftBank Corp. 6,400
350 AS17509 STARNET Co.,Ltd. 6,144
351 AS17680 SCSK Corporation 6,144
352 AS18088 Kyuden Infocom Company Inc 6,144
353 AS18264 Seikei Eizo Network Inc. 6,144
354 AS18266 Cable Networks Akita Co.,ltd. 6,144
355 AS23613 New Media Tokushima Co.,ltd. 6,144
356 AS23631 Sofu System, Inc 6,144
357 AS23639 NTT Bizlink, Inc. 6,144
358 AS23641 NS Computer Service Corporation 6,144
359 AS23776 NEC Corporation 6,144
360 AS58788 Chiroro-Net Co.,Ltd. 6,144
361 AS59094 esu2 Corporation 6,144
362 AS131896 SSI Lab Inc. 6,144
363 AS131949 General Incorporated Foundation Aso Telework Center 6,144
364 AS131954 Kawaguchiko cable television Inc 6,144
365 AS137445 PF LINK SYSTEMS 5,888
366 AS139076 EnjoyVC Japan Corporation 5,888
367 AS24284 CyberAgent, Inc. 5,632
368 AS131893 RICOH Company, Ltd. 5,632
369 AS139468 DC Communications Inc. 5,632
370 AS17937 NIKKEI ADVANCED SYSTEMS INC. 5,376
371 AS9353 MEDIAWARS co.,ltd. 5,120
372 AS24270 CRC Solutions Corp., 5,120
373 AS37907 DigiRock, Inc. 5,120
374 AS37916 A.T.WORKS, Inc. 5,120
375 AS38651 MIXI, Inc. 5,120
376 AS7521 INTERNET MULTIFEED CO. 4,864
377 AS23614 Kochi Systems Co., Ltd. 4,864
378 AS37897 AXEL ENTERMEDIA, INC. 4,608
379 AS59116 AIG Technologies KK 4,608
380 AS59118 NRI SecureTechnologies, Ltd. 4,608
381 AS37914 Advanced Software Technology and Management Research Institute of KYOTO 4,352
382 AS55897 SAKURA Internet Inc. 4,352
383 AS55912 University of Kochi 4,352
384 AS9990 Nippon Information and Communication Corporation
211.125.224.0/20		 4,096
385 AS10016 Minaminihon Information Processing Center Co Ltd
61.205.64.0/20		 4,096
386 AS17685 SQUARE ENIX CO., LTD.
61.195.48.0/20		 4,096
387 AS17699 ARTERIA Networks Corporation
218.40.32.0/20		 4,096
388 AS18074 FRT Inc.
210.175.224.0/20		 4,096
389 AS18140 LY Corporation
104.145.16.0/20		 4,096
390 AS18141 HBA
219.109.32.0/20		 4,096
391 AS18143 Mitsubishi Research Institute DCS Co.,Ltd.
202.254.32.0/20		 4,096
392 AS18259 NTT DOCOMO BUSINESS, Inc
202.178.96.0/20		 4,096
393 AS18263 MEITETSUCOM Co., Ltd.
219.113.32.0/20		 4,096
394 AS23773 EKZM co.,ltd.
210.233.80.0/20		 4,096
395 AS23795 Fitec Corp. 4,096
396 AS23798 VR Techno Center,inc
202.69.112.0/20		 4,096
397 AS23824 Future Spirits Co.,Ltd.
219.99.160.0/20		 4,096
398 AS23836 RELATION Co., Ltd. 4,096
399 AS24264 Kanazawa Institute of Technology
202.13.160.0/20		 4,096
400 AS24477 NetApp, Inc.
202.3.112.0/20		 4,096

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