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
501 AS59129 LogicLinks, Inc. 1,280
502 AS63773 dual&Co. Inc. 1,280
503 AS63801 DODO K.K. 1,280
504 AS131900 Directorz Co.,Ltd. 1,280
505 AS131912 Cybozu,Inc. 1,280
506 AS131917 Toshiba I.S. corp 1,280
507 AS133203 SBI BITS Co., Ltd. 1,280
508 AS146979 University of Nagasaki 1,280
509 AS4718 Cyber Kansai Project
210.156.0.0/22		 1,024
510 AS4774 A-Bone by Internet Initiative Japan Inc.
202.6.252.0/22		 1,024
511 AS7500 WIDE Project 1,024
512 AS7660 Asia Pacific Advanced Network - Japan 1,024
513 AS18091 Teikyo University
202.253.108.0/22		 1,024
514 AS18149 Japan Registry Service Co., Ltd. 1,024
515 AS18279 Bukkyo University
202.254.196.0/22		 1,024
516 AS18289 AT&T TAO Cloud Access Node
210.88.188.0/22		 1,024
517 AS23799 National Defense Academy 1,024
518 AS23826 Daido University
202.11.120.0/22		 1,024
519 AS37893 Tradeweb Japan 1,024
520 AS37900 NTT DOCOMO BUSINESS, Inc. 1,024
521 AS37904 BBIX, Inc. 1,024
522 AS38648 F-REGI Co.,Ltd.
203.76.164.0/22		 1,024
523 AS55378 QUICK Corp.
27.100.32.0/22		 1,024
524 AS55382 Nagato city office
223.223.160.0/22		 1,024
525 AS55569 Criteo APAC
182.161.72.0/22		 1,024
526 AS55888 Nintatsu Global Telecommunications Corporation 1,024
527 AS55891 WATCH TOWER BIBLE AND TRACT SOCIETY
103.10.240.0/22		 1,024
528 AS55894 Who's Next
103.5.176.0/22		 1,024
529 AS55907 GMO Internet, Inc.
157.7.32.0/22		 1,024
530 AS58645 Miyagi Cable TV Co.,Ltd
103.13.168.0/22		 1,024
531 AS59097 Okinawa Cross Head Co., Ltd.
103.234.176.0/22		 1,024
532 AS59110 BPS Inc.
103.49.140.0/22		 1,024
533 AS63789 NeXtWEB Corporation
202.9.208.0/22		 1,024
534 AS63793 Japan OPS Better Co., Ltd. 1,024
535 AS131160 Wire and Wireless Co.,Ltd.
103.5.140.0/22		 1,024
536 AS131901 FIDESSA KK
103.52.128.0/22		 1,024
537 AS131905 Japan Registry Services Co., Ltd. 1,024
538 AS131939 IPS INC
103.120.16.0/22		 1,024
539 AS131941 Entsu Co.,Ltd.
103.121.44.0/22		 1,024
540 AS131942 Gurunavi, Inc.
103.129.28.0/22		 1,024
541 AS131945 Sanntuu Corporation
103.137.240.0/22		 1,024
542 AS131961 Dokkyo University
202.252.104.0/22		 1,024
543 AS131963 MC Digital Realty, Inc.
103.16.216.0/22		 1,024
544 AS131969 Suzuyo Shinwart Corporation
133.88.20.0/22		 1,024
545 AS133458 FPT Smart Cloud Japan Co., Ltd 1,024
546 AS133476 First Innovation K.K.
103.75.212.0/22		 1,024
547 AS138033 BBIX, Inc
103.120.84.0/22		 1,024
548 AS151388 SoftEther Corporation (SE-JIKKEN-AS) 1,024
549 AS152858 Woven by Toyota, Inc.
209.107.140.0/22		 1,024
550 AS152871 TAIYO NIPPON SANSO CORPORATION
202.18.244.0/22		 1,024
551 AS153929 Allied Business Inc. 1,024
552 AS24263 HONDA MOTOR Co., Ltd. 768
553 AS24283 Mieden Co.,Ltd. 768
554 AS24291 MITSUI & CO., LTD. 768
555 AS37888 HORIBA, Ltd. 768
556 AS38074 SDCC Japan-West Area 768
557 AS45679 Tatsumi, Tomo 768
558 AS63776 Mercari, Inc. 768
559 AS131077 Deloitte Tohmatsu Group LLC 768
560 AS133900 Gilead Sciences, Inc. 768
561 AS142165 Bosch Corporation 768
562 AS146987 GMO GlobalSign Holdings K.K. 768
563 AS148985 ANSYS Japan K.K. 768
564 AS150369 TelHi Corporation 768
565 AS152645 Flextech Inc. 768
566 AS4777 Asia Pacific Network Information Centre 512
567 AS10209 Japan HUB and Data Center
198.182.50.0/23		 512
568 AS17941 Equinix Japan Enterprise K.K. 512
569 AS24260 Board of trusty: Kinjo-Gakuen
202.223.230.0/23		 512
570 AS38636 DeNA, Co. Ltd. 512
571 AS38656 Loutres
161.248.40.0/23		 512
572 AS55396 NRI SecureTechnologies, Ltd 512
573 AS55911 kazukichi
157.66.180.0/23		 512
574 AS59098 Mamireimu Net Work's
103.149.4.0/23		 512
575 AS59120 Tsukuba Internet Service Corporation
202.222.10.0/23		 512
576 AS59349 GMO-Z.COM PTE. LTD.
103.234.170.0/23		 512
577 AS63781 Kobayashi Family Net LLP
103.143.136.0/23		 512
578 AS63785 Fukuoka University 512
579 AS63790 CyberAgent, Inc.
103.167.206.0/23		 512
580 AS63791 doornoc
103.169.144.0/23		 512
581 AS63794 ILKS Inc.
103.187.128.0/23		 512
582 AS63797 CuteIP
103.48.40.0/23		 512
583 AS63799 Ghost Network
103.108.46.0/23		 512
584 AS63804 DOVA Corporation
101.78.4.0/23		 512
585 AS63806 Human-life Information Platforms Institute 512
586 AS131902 LogicLinks, Inc. 512
587 AS131940 Nissho Electronics Corp.
202.19.222.0/23		 512
588 AS131946 MUSASHINO UNIVERSITY E.F.
202.240.108.0/23		 512
589 AS131953 NPO Yutopianet
103.153.204.0/23		 512
590 AS131977 Japan Photo Finish Corporation
103.159.140.0/23		 512
591 AS131983 suo cablenet corporation
103.163.0.0/23		 512
592 AS131988 Takehara Cable Network Co,Ltd
103.170.124.0/23		 512
593 AS132504 QUALITIA Co.,Ltd
223.27.118.0/23		 512
594 AS133782 Elsevier Ltd
198.176.84.0/23		 512
595 AS136178 FIL Japan Holdings K.K.
103.80.222.0/23		 512
596 AS136586 InComm Japan K.K.
103.149.30.0/23		 512
597 AS136761 Kalytero LLC
162.4.180.0/23		 512
598 AS136779 Schneider Electric Japan Ltd
159.215.140.0/23		 512
599 AS137819 Beeks Financial Cloud (Japan) 512
600 AS138321 Lunasla Inc.
163.128.154.0/23		 512

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