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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 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS154661JP | Nintatsu-2 - Nintatsu Global Telecommunications Corporation | — | — | 0 |
| AS131936JP | UMGJP-NET - UNIVERSAL MUSIC LLC | — | — | 0 |
| AS23779JP | N-BONE - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS18122JP | KYOTO-IX - Advanced Software Technology & Management Research Institute of KYOTO | — | — | 0 |
| AS151389JP | Synergy-net - Synergy Cross Corporation | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4696JP | AS4696-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23794JP | BMCDN - Broadmedia Corporation | — | — | 0 |
| AS18145JP | AS18145-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17942JP | AS17942-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18080JP | SOPIA - Sopiafons Co.,Ltd | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23622JP | TSURU-GAKUEN - Tsuru Gakuen | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS133795JP | CHOOPALLC-AS-AP - The Constant Company, LLC | — | — | 0 |
| AS59112JP | PLUSONE - Plus One marketing Ltd. | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS63000JP | US-CORE - Auk LLC | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS9379JP | AS9379-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| 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 |
| AS24266JP | AS24266-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7526JP | MIND-US - Mitsubishi Electric Information Network Corporation | — | — | 0 |
| AS4704JP | SANNET - Rakuten Mobile, Inc. | — | — | 0 |
| AS7504JP | AS7504-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS150365JP | LL-NET - LifeLink Co.,Ltd | — | — | 0 |
| AS131959JP | AS131959-55 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS152925JP | NARIYASUSANGYOKK-AS-AP - Nariyasu Sangyo Co., Ltd. | — | — | 0 |
| AS23813JP | SORUN - SORUN Corporation | — | — | 0 |