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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 |
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| 0 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131922JP | LN-NET - leafnet Co.,Ltd. | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| 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 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| AS9369JP | AS9369-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10020JP | AS10020-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17945JP | iTV - iTV Co,Ltd | — | — | 0 |
| AS131157JP | MAGMA-IPV6 - IMS Corporation | — | — | 0 |
| AS138695JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS7619JP | IIJLAB-BACKUP-LINKS-EXP - Internet Initiative Japan, Inc. | — | — | 0 |
| AS23637JP | BI-CDN-IX - Equinix Japan Enterprise K.K. | — | — | 0 |
| AS17520JP | AS17520-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17513JP | AS17513-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9602JP | AS9602-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151195JP | NGIKK-AS-AP - Nova Global ICT Kabushiki Kaisha | — | — | 0 |
| AS151073JP | AS-VMW-SYD - VMWare Incorporation | — | — | 0 |
| AS150143JP | IOTMEDIALAB-AS-AP - IotMedia Lab | — | — | 0 |
| AS151031JP | TAO_AUCKLAND - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151023JP | TAO_SYDNEY5 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS63524JP | ASN-EQIX-CLOUD-OS - Equinix Asia Pacific | — | — | 0 |
| AS55896JP | VIDEX - Videx Inc. | — | — | 0 |
| AS37895JP | RYUKOKU - Ryukoku University | — | — | 0 |
| AS17697JP | BBX - NTT PC Communications, Inc. | — | — | 0 |
| AS17673JP | MKInet - MITSUI KNOWLEDGE INDUSTRY CO., LTD. | — | — | 0 |
| AS9606JP | ISAS-AS - Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency | — | — | 0 |
| AS150298JP | MORE-WAIFU-BACKBONE - More Waifu Backbone | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS4683JP | AS4683-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS401655JP | TRANSVISIONNET - TransVision LLC | — | — | 0 |
| AS23625JP | TOKAI-WBS - TOKAI Communications Corporation | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS131978JP | NTTCOM-VoIP - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS131083JP | MARCHE-LAB - Mercari, Inc. | — | — | 0 |
| AS147058JP | UNGK-AS-AP - 1200-03-019901 | — | — | 0 |
| AS18269JP | KAI - Kai Creates Inc. | — | — | 0 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9598JP | MPLS-OCN - NTT DOCOMO BUSINESS,Inc. | — | — | 0 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7681JP | AS7681-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150314JP | RIVULETNETWORKS-AS-AP - Rivulet Networks | — | 1 | 1 |