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
601 AS138352 Fractal Co., Ltd.
162.4.26.0/23		 512
602 AS139255 U-NEXT Co.,Ltd.
103.140.112.0/23		 512
603 AS141461 Reconciled Awareness Network
160.236.116.0/23		 512
604 AS142052 Mempool Space K.K.
103.165.192.0/23		 512
605 AS146974 Woven by Toyota, Inc.
103.175.110.0/23		 512
606 AS146981 Nekojarashi Inc.
103.189.188.0/23		 512
607 AS146985 KISSEI COMTEC Co.,Ltd
103.144.248.0/23		 512
608 AS147035 Ching Kuo
103.122.116.0/23		 512
609 AS150356 GMO BRAND SECURITY Inc.
103.42.130.0/23		 512
610 AS151350 NIPPON COMMUNICATIONS INC.
103.209.74.0/23		 512
611 AS151371 PAINA Information Development
103.225.252.0/23		 512
612 AS151383 EZSVS Japan Co., Ltd.
157.20.52.0/23		 512
613 AS151385 Japanet Holdings Co.,Ltd.
157.66.22.0/23		 512
614 AS151390 RUTILEA, Inc.
157.66.254.0/23		 512
615 AS152865 Tokyo University of Technology Linux Club
160.187.26.0/23		 512
616 AS152872 VirtualLink Networks
165.99.146.0/23		 512
617 AS152873 Neodyland
43.229.16.0/23		 512
618 AS152876 Comota Co., Ltd.
144.79.120.0/23		 512
619 AS152877 Nintendo Co., Ltd
151.158.220.0/23		 512
620 AS4690 WIDE Project
202.0.73.0/24		 256
621 AS5111 Aibo Link Co., Ltd.
80.47.95.0/24		 256
622 AS9434 Internet Initiative Japan, Inc.
147.28.11.0/24		 256
623 AS9609 BBIX, Inc.
61.245.110.0/24		 256
624 AS9935 AGNS Customer AS
193.149.194.0/24		 256
625 AS17905 Commerzbank AG
193.108.157.0/24		 256
626 AS18069 SoftBank Corp.
133.217.192.0/24		 256
627 AS18131 NTT DOCOMO BUSINESS, Inc.
192.47.166.0/24		 256
628 AS23634 WIDE Project
192.50.43.0/24		 256
629 AS23642 OBIS
202.4.250.0/24		 256
630 AS23761 Xpedite Systems
202.41.134.0/24		 256
631 AS23774 Japan Registry Service Co., Ltd.
203.119.1.0/24		 256
632 AS23833 Marusan Securities Co., LTD.
202.61.1.0/24		 256
633 AS24252 Japan Registry Service Co., Ltd.
203.119.40.0/24		 256
634 AS24287 National Institute of Informatics
192.50.12.0/24		 256
635 AS37905 Brastel Co.,Ltd
202.173.5.0/24		 256
636 AS37906 GMO NetIRD, Inc.
202.254.128.0/24		 256
637 AS38215 Syuhei Uda
103.164.236.0/24		 256
638 AS38629 NTT DOCOMO BUSINESS, Inc
202.245.31.0/24		 256
639 AS38644 INTERNET MULTIFEED CO.
115.69.238.0/24		 256
640 AS38647 NEI's NetLab
160.25.216.0/24		 256
641 AS38649 The University of Electro-Communications
192.50.27.0/24		 256
642 AS45217 Tora Trading Services Ltd.
67.200.58.0/24		 256
643 AS45674 BIGLOBE Inc.
192.47.117.0/24		 256
644 AS45678 ABN AMRO Clearing Tokyo Co., Ltd.
202.58.234.0/24		 256
645 AS55373 Foundation for Biomedical Research and Innovation at Kobe
202.70.140.0/24		 256
646 AS55890 Suntory Business Systems Ltd.
202.253.247.0/24		 256
647 AS55895 N.S.Computer Service Co.,Ltd.
117.102.169.0/24		 256
648 AS55901 Sony Computer Entertainment Inc
103.123.139.0/24		 256
649 AS55909 National Institute of Technology, Kochi College
103.12.158.0/24		 256
650 AS55949 Technopro Holdings
202.94.86.0/24		 256
651 AS58649 GMO Internet, Inc.
118.27.94.0/24		 256
652 AS58651 GMO Internet, Inc.
150.95.14.0/24		 256
653 AS58790 SERVER-G Group
44.30.62.0/24		 256
654 AS59106 Cyber and Internet Association
203.178.12.0/24		 256
655 AS59111 Akita International University
103.52.132.0/24		 256
656 AS59115 CYBERDYNE Inc.
103.61.151.0/24		 256
657 AS59124 KYOTO Prefectural Government
202.34.14.0/24		 256
658 AS59128 Kyoto University Microcomputer Club
192.50.220.0/24		 256
659 AS63780 dual&Co. Inc.
103.139.106.0/24		 256
660 AS63795 RoutelNet
103.187.126.0/24		 256
661 AS63800 SERVER-G Group
103.131.151.0/24		 256
662 AS131079 INTERNET MULTIFEED CO.
115.69.239.0/24		 256
663 AS131156 LAC Co., Ltd.
103.189.185.0/24		 256
664 AS131894 UNIADEX, LTD.
223.223.166.0/24		 256
665 AS131895 Okinawa Institute of science and technology
103.226.54.0/24		 256
666 AS131903 Nomura Research Institute,Ltd.
103.59.89.0/24		 256
667 AS131913 JPNIC-4Byte-ASBLOCK-AP
163.227.4.0/24		 256
668 AS131924 Kansai Airports
103.102.3.0/24		 256
669 AS131948 FORNEXT Inc.
103.177.117.0/24		 256
670 AS131951 Suzuyo Shinwart Corporation
133.88.31.0/24		 256
671 AS131964 FAMILYNET JAPAN CORPORATION
160.237.191.0/24		 256
672 AS131976 INTERNET MULTIFEED CO.
218.100.45.0/24		 256
673 AS131984 JOCDN Inc.
103.162.255.0/24		 256
674 AS131989 PFU LIMITED
202.216.170.0/24		 256
675 AS132119 TECPRESSO Inc.
163.61.104.0/24		 256
676 AS132211 FX Corporate LLC
103.7.92.0/24		 256
677 AS132610 Japan Network Information Center
162.4.238.0/24		 256
678 AS133180 Starbow Ltd.
14.137.228.0/24		 256
679 AS133405 RETN Co., Ltd.
163.128.219.0/24		 256
680 AS133780 Quantum Mesh Co.,Ltd.
144.79.51.0/24		 256
681 AS134827 EY Japan Co., Ltd.
103.27.254.0/24		 256
682 AS135372 Columbia Sportswear Japan Inc
203.142.10.0/24		 256
683 AS137008 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken
202.53.152.0/24		 256
684 AS138652 Super Godzilla Communications GK
103.135.244.0/24		 256
685 AS139472 Catalina Marketing Japan K.K.
198.204.78.0/24		 256
686 AS140501 Itiviti Japan K.K.
103.150.2.0/24		 256
687 AS141694 Ermis Ltd.
160.222.193.0/24		 256
688 AS146972 TOYO Engineering Corporation
103.175.36.0/24		 256
689 AS146980 Tokyo Metropolitan College of Industrial Technology Infomation System Engineering Course
103.184.10.0/24		 256
690 AS146982 Shinnyo-en
103.190.111.0/24		 256
691 AS146984 INTERNET MULTIFEED CO.
115.69.236.0/24		 256
692 AS146986 SUZUYO SHINWART CORPORATION
133.88.28.0/24		 256
693 AS150357 University of Nagasaki
103.13.27.0/24		 256
694 AS150368 SERVER-G Group
103.131.150.0/24		 256
695 AS150685 Ching Kuo
103.55.240.0/24		 256
696 AS151376 Solare Hotels and Resorts Co., Ltd.
180.94.1.0/24		 256
697 AS151377 Solare Hotels and Resorts Co., Ltd.
180.94.6.0/24		 256
698 AS151378 Credit SAISON Co., Ltd.
210.87.98.0/24		 256
699 AS151379 OPTAGE Inc.
36.50.252.0/24		 256
700 AS152184 Tamukai Network
140.235.121.0/24		 256

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