ASNs in Japan

847 Autonomous Systems are registered in Japan, ordered by the IPv4 space our directory attributes to each. Page 1 of 9.

Networks 1-100 by IPv4 Space

The badge is how many IPv4 /24 blocks our directory attributes to each network. For the prefixes an AS is announcing right now, open its page.

AS17676SoftBank Corp.
softbank.jp
149,899
AS4713NTT DOCOMO BUSINESS,Inc.
ntt.com
111,812
AS2516KDDI CORPORATION
kddi.com
70,599
AS2907Research Organization of Information and Systems, National Institute of Informatics
sinet.ad.jp
33,964
AS17506ARTERIA Networks Corporation
arteria-net.com
21,024
AS9824JCOM Co., Ltd.
jcom.co.jp
18,536
AS2527Sony Network Communications Inc.
sonynetwork.co.jp
15,108
AS2497Internet Initiative Japan Inc.
iij.ad.jp
14,819
AS2518BIGLOBE Inc.
biglobe.co.jp
14,336
AS17511OPTAGE Inc.
optage.co.jp
11,689
AS9605NTT DOCOMO, INC.
nttdocomo.com
9,908
AS2514NTT PC Communications, Inc.
nttpc.co.jp
8,104
AS10013FreeBit Co.,Ltd.
freebit.com
7,594
AS4725SoftBank Corp.
softbank.jp
7,500
AS9595NTT-ME Corporation
ntt-me.co.jp
5,912
AS18126Chubu Telecommunications Company, Inc.
ctc.co.jp
5,881
AS10010TOKAI Communications Corporation
tokai-com.co.jp
5,868
AS2510FUJITSU LIMITED
web.ad.jp
5,818
AS2519ARTERIA Networks Corporation
arteria-net.com
5,719
AS15830Equinix (EMEA) Acquisition Enterprises B.V.
equinix.com
5,650
AS4685Asahi Net
asahi-net.jp
4,992
AS9617JCOM Co., Ltd.
jcom.co.jp
4,544
AS4694IDC Frontier Inc.
idcf.jp
4,067
AS7679QTnet,Inc.
qtnet.co.jp
2,972
AS4721JCOM Co., Ltd.
jcom.co.jp
2,468
AS7522STNet, Incorporated
stnet.co.jp
2,324
AS7671NTT SmartConnect Corporation
nttsmc.com
1,772
AS18081Kintetsu Cable Network Co., Ltd.
kcn.jp
1,728
AS138384Rakuten Mobile Network, Inc.
rakuten.co.jp
1,644
AS9365its communications Inc.
itscom.jp
1,580
AS18071Panasonic Information Systems Co., Ltd
panasonic.com
1,497
AS7684SAKURA Internet Inc.
sakura.ad.jp
1,440
AS7524ITEC HANKYU HANSHIN CO.,LTD.
hankyu-hanshin.co.jp
1,424
AS9370SAKURA Internet Inc.
sakura.ad.jp
1,332
AS131932JR East Information Systems Company
jreast.co.jp
1,280
AS19527Google LLC
google.com
1,219
AS54253Oracle Corporation
oracle.com
1,190
AS9371SAKURA Internet Inc.
sakura.ad.jp
1,161
AS18144Enecom,Inc.
enecom.co.jp
1,140
AS9597KDDI Web Communications Inc.
kddi-webcommunications.co.jp
1,080
AS7506GMO Internet, Inc.
gmo.jp
987
AS9351ZTV CO.,LTD
ztv.co.jp
976
AS4673NTT DATA CORPORATION
nttdata.com
944
AS2522Japan Network Information Center
nic.ad.jp
893
AS2506NTT business Solutions corporation
apnic.net
837
AS7687TOYOTA SYSTEMS CORPORATION
toyotasystems.com
784
AS4686BEKKOAME INTERNET INC.
bekkoame.co.jp
783
AS9619Sony Global Solutions Inc.
sonygs.co.jp
780
AS9354Community Network Center Inc.
cnci.co.jp
779
AS2501The University of Tokyo
u-tokyo.ac.jp
768
AS23793National Institute of Advanced Industrial Science and Technology
aist.go.jp
768
AS7514Computer Engineering & Consulting, Ltd.
cec-ltd.co.jp
750
AS17698COMMUNITY NETWORK CENTER INCORPORATED.
cnci.co.jp
680
AS9374EDION Corporation
edion.co.jp
648
AS9614JCOM Marketing Co.,Ltd.
sakura.ad.jp
648
AS131965XServer Cloud Inc.
xserver.co.jp
645
AS9997Suzuka Cable Co.,Ltd
cty-cns.jp
616
AS10006SECOM Trust Systems Co.,Ltd.
secomtrust.net
571
AS18077Yamaguchi Cable Vision Co.,Ltd
c-able.co.jp
562
AS17529STARCAT Co .,LTD.
starcat.ne.jp
529
AS7670Enecom,Inc.
enecom.co.jp
526
AS37917University of Tsukuba
tsukuba.ac.jp
516
AS2504Kyoto University
kyoto-u.ac.jp
512
AS4729Japan Atomic Energy Agency
jaea.go.jp
512
AS7509Hokkaido University
hokudai.ac.jp
512
AS9355National Institute of Information and Communications Technology
nict.go.jp
512
AS17687National University Corporation Nagoya University
nagoya-u.ac.jp
512
AS38635Keio University
keio.ac.jp
512
AS63802Nippon Telegraph and Telephone East Corporation
ntt-east.co.jp
512
AS7516TOHKnet Co.,Inc.
tohknet.co.jp
465
AS24572Yahoo Japan
yahoo.co.jp
464
AS3488Japan Aerospace Exploration Agency
jaxa.jp
450
AS10021KVH Co.,Ltd
kvhasia.com
432
AS38631LY Corporation
lycorp.co.jp
423
AS59108KATCH NETWORK INC.
katch.co.jp
376
AS17534NSK Co.,Ltd.
nsk-kk.com
368
AS131921GMO GlobalSign Holdings K.K.
gmogshd.com
363
AS17707AS for DATAHOTEL, which is one of iDC in Japan,
nhn-techorus.com
353
AS4678Canon IT Solutions Inc.
canon-its.co.jp
352
AS9993ITOCHU Techno-Solutions Corporation
ctc-g.co.jp
348
AS24282KAGOYA JAPAN Inc.
kagoya.com
348
AS58791GMO Internet, Inc.
gmo.jp
339
AS17514Otsuka Corp.
otsuka-shokai.co.jp
328
AS9600So-net Corporation
bit-drive.ne.jp
324
AS7511SYNAPSE Co.,Ltd.
synapse.jp
308
AS9622Kurashiki Cable TV
kct.co.jp
308
AS18260EHIME CATV CO.,LTD.
e-catv.ne.jp
307
AS38628HIMEJI CABLE TELEVISION CORPORATION
winknet.ne.jp
304
AS9621OTNet Co.,Inc.
ii-okinawa.ad.jp
300
AS2505High Energy Accelerator Research Organization, KEK
kek.jp
288
AS10000Nagasaki Cable Media Inc.
cncm.ne.jp
288
AS58647Kagawa University
kagawa-u.ac.jp
288
AS55374FUJITSU LIMITED
fujitsu.com
287
AS23781Toyama University
u-toyama.ac.jp
284
AS9615TOYOHASHI CABLE NETWORK INC.
tees.ne.jp
280
AS7502Advanced Software Technology & Management Research Institute of KYOTO
ip-kyoto.ad.jp
274
AS203061UAB code200
itproximus.com
273
AS17947SAKURA KCS Corporation.
kcs.co.jp
272
AS18271Sojitz Tech Innovation Co., Ltd.
sojitz.com
272
AS23820Rakuten Group, Inc.
rakuten.co.jp
272

Looking for a different country? The ASN Directory lists every one we hold, with its network count.