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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to Japan over time.
The largest autonomous systems registered to Japan by IPv4 footprint.
Share of announced address space covered by valid Route Origin Authorizations.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 256 |
| — |
| 1 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 8 | 9 |
| AS38644JP | KANDANET - INTERNET MULTIFEED CO. | 256 | 1 | 2 |
| AS152859JP | U-Cloud-3 - UNIADEX, LTD. | 256 | — | 1 |
| AS131156JP | LAC-AS - LAC Co., Ltd. | 256 | 1 | 2 |
| AS9434JP | ABONE-AS-AP - Internet Initiative Japan, Inc. | 256 | — | 1 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | 256 | — | 1 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS133405JP | RETNKK-AS-AP - RETN Co., Ltd. | 256 | 1 | 2 |
| AS151377JP | SHR-OSA-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS55895JP | echigo-IX - N.S.Computer Service Co.,Ltd. | 256 | 1 | 2 |
| AS138652JP | SGCOM-AS-AP - Super Godzilla Communications GK | 256 | 65.5K | 2 |
| AS24287JP | TEIN2-JP - National Institute of Informatics | 256 | 1 | 2 |
| AS63781JP | KFNET-AS - Kobayashi Family Net LLP | 256 | 65.5K | 2 |
| AS151378JP | CSAISON-NET - Credit SAISON Co., Ltd. | 256 | — | 1 |
| AS131984JP | JOCDN - JOCDN Inc. | 256 | 1 | 2 |
| AS215239JP | SHOW Show Corporation | — | 512 | 2 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS138181JP | HEXHU - Hu's Tech LLC | — | 3 | 2 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9369JP | AS9369-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS199436JP | A-NET BangLong Yang | — | 285 | 12 |
| AS213471JP | IPPNOC YAMAMOTO Hiroshi | — | 145 | 7 |
| AS17517JP | AS17517-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7681JP | AS7681-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150314JP | RIVULETNETWORKS-AS-AP - Rivulet Networks | — | 1 | 1 |
| AS215871JP | XTOM-JP xTom Japan Corporation | — | 524.3K | 1 |
| AS199767JP | DOVE-AS Pinjia Zhao | — | 256 | 1 |
| AS4722JP | SB4722 - SoftBank Corp. | — | — | 0 |
| AS9380JP | CNCI-AS - Community Network Center Inc. | — | — | 0 |
| AS7669JP | AS7669-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45681JP | SHOW - Show Corporation | — | 512 | 2 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS214772JP | NAZUKI-AS CHEN LUOAN | — | 16 | 1 |
| AS9375JP | AS9375-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS140868JP | TAKATASDCC-AS-AP - TakataSDCC Net | — | 2 | 2 |
| AS152860JP | GJW-KK - GANJINGWORLD K.K. | — | 1 | 1 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS138986JP | WINDCLOUDNETWORK-MO - INAP Japan Tokyo Shiohama DC | — | 16 | 1 |
| AS201345JP | Shuma-Watanabe Shuma Watanabe | — | 261 | 3 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |