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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.
1,300 autonomous systems registered to Japan. Click an AS for detail.
| 667 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 236 |
| 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 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS400593JP | TRIDATA - tricloud | — | — | 0 |
| AS131936JP | UMGJP-NET - UNIVERSAL MUSIC LLC | — | — | 0 |
| AS23792JP | AS23792-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18145JP | AS18145-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS63000JP | US-CORE - Auk LLC | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24266JP | AS24266-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23622JP | TSURU-GAKUEN - Tsuru Gakuen | — | — | 0 |
| AS17959JP | AS17959-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS4699JP | AS4699-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS3510JP | ERX-RWC-NET - Real World Computing Partnership | — | — | 0 |
| AS23813JP | SORUN - SORUN Corporation | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS139470JP | ONECHRONOS-AS-AP - OCX GROUP INC. | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS131906JP | GAPINC-NET - Gap Japan K.K. | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS9995JP | AS9995-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS201345JP | Shuma-Watanabe Shuma Watanabe | — | 261 | 3 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS18138JP | SAKURA-G - SAKURA Internet Inc. | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS24269JP | AS24269-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9379JP | AS9379-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4706JP | AS4706-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7510JP | AS7510-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131959JP | AS131959-55 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS154661JP | Nintatsu-2 - Nintatsu Global Telecommunications Corporation | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |