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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 |
| — |
| — |
| 0 |
| AS38640JP | SAKURA-E - SAKURA Internet Inc. | — | — | 0 |
| AS38715JP | Tottori-Regional-IX-AS - Regional-IX ASN Tottori pref Japan. | — | — | 0 |
| AS32340JP | ZEN-BACKBONE - ZenWalk | — | — | 0 |
| AS140683JP | STARBOWLTD-AS-AP - Starbow Ltd. | — | — | 0 |
| AS4707JP | AS4707-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17935JP | AS17935-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23621JP | AS23621-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS17679JP | AS17679-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7662JP | AS7662-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131962JP | AS131962-58 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS2525JP | AS2525-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131936JP | UMGJP-NET - UNIVERSAL MUSIC LLC | — | — | 0 |
| AS63807JP | AS63807-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7691JP | AS7691-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS151069JP | AS-VMW-MEL - VMWare Incorporation | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS18078JP | AS18078-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63809JP | AS63809-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS149993JP | M4B42UG-AS-AP - 4b42 UG | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS23813JP | SORUN - SORUN Corporation | — | — | 0 |
| AS131081JP | InetCore4 - Intec NetCore, Inc. | — | — | 0 |
| AS4727JP | BSS - KYODO PRINTING BUSINESS SOLUTIONS CO.,LTD | — | — | 0 |
| AS24288JP | ACCUTECHS - Accutechs Co., Ltd. | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23637JP | BI-CDN-IX - Equinix Japan Enterprise K.K. | — | — | 0 |
| AS131968JP | MHBK-CLH-OS - Mizuho Bank, Ltd | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS23802JP | AS23802-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131083JP | MARCHE-LAB - Mercari, Inc. | — | — | 0 |
| AS37981JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS37924JP | KKR-MLIT-AS - Ministry of Land, Infrastructure and Transport Kinki Regional Development Bureau | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9904JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS151384JP | BBIX-CACHE - BBIX, Inc. | — | — | 0 |
| AS151389JP | Synergy-net - Synergy Cross Corporation | — | — | 0 |