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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.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
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| — |
| 0 |
| AS140868JP | TAKATASDCC-AS-AP - TakataSDCC Net | — | 2 | 2 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS4717JP | AI3 - WIDE Project | — | 81.9K | 2 |
| AS201345JP | Shuma-Watanabe Shuma Watanabe | — | 261 | 3 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS138986JP | WINDCLOUDNETWORK-MO - INAP Japan Tokyo Shiohama DC | — | 16 | 1 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS152860JP | GJW-KK - GANJINGWORLD K.K. | — | 1 | 1 |
| AS138181JP | HEXHU - Hu's Tech LLC | — | 3 | 2 |
| AS218871JP | NISHIO-AS Kazuto Nishio | — | 16 | 1 |
| AS45681JP | SHOW - Show Corporation | — | 512 | 2 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |
| AS18138JP | SAKURA-G - SAKURA Internet Inc. | — | — | 0 |
| AS199436JP | A-NET BangLong Yang | — | 285 | 12 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS150314JP | RIVULETNETWORKS-AS-AP - Rivulet Networks | — | 1 | 1 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS18146JP | InetCore - Intec NetCore, Inc. | — | — | 0 |
| AS23819JP | AS23819-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18095JP | REITAKU - Reitaku University | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45682JP | ASN-EXCITE - Excite Japan Co., Ltd. | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18261JP | AS18261-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS218640JP | KC-AS Kansei CHIBA | — | 1 | 1 |
| AS18079JP | AS18079-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | 1 | 1 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS38646JP | BENKYO-NET - Neodyland | — | 1 | 1 |
| AS37981JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS56218JP | QGPOP-AS-AP - QGPOP | — | 65.5K | 1 |
| AS18265JP | AS18265-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS213471JP | IPPNOC YAMAMOTO Hiroshi | — | 65 | 5 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS215239JP | SHOW Show Corporation | — | 512 | 2 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |