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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 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4691JP | DTI - Dream Train Internet Inc. | — | — | 0 |
| AS9349JP | AS9349-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38033JP | YAHOO-JP2-AP - internet content provider | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS151070JP | AS-VMW-KIX - VMWare Incorporation | — | — | 0 |
| AS152866JP | GTT-NET - General Incorporated Foundation GovTechTokyo | — | — | 0 |
| AS17933JP | NTT-EAST - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24285JP | AS24285-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24294JP | AS24294-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7691JP | AS7691-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38630JP | AS38630-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18275JP | AS18275-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9613JP | AS9613-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23779JP | N-BONE - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 0 |
| AS18261JP | AS18261-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4689JP | AS4689-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS45682JP | ASN-EXCITE - Excite Japan Co., Ltd. | — | — | 0 |
| AS400593JP | TRIDATA - tricloud | — | — | 0 |
| AS133795JP | CHOOPALLC-AS-AP - The Constant Company, LLC | — | — | 0 |
| AS131906JP | GAPINC-NET - Gap Japan K.K. | — | — | 0 |
| AS45673JP | OECU-NET - Osaka Electro-Communication University | — | — | 0 |
| AS63000JP | US-CORE - Auk LLC | — | — | 0 |
| AS38080JP | FSW-Tohoku-POP - Foresightwave INC. | — | — | 0 |
| AS23782JP | AS23782-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18151JP | CEC - COMPUTER ENGINEERING & CONSULTING LTD. | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2528JP | AS2528-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS18080JP | SOPIA - Sopiafons Co.,Ltd | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17801JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS17533JP | AS17533-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS151029JP | TAO_MIAMI1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS142584JP | IMAGINGBAYINC-AS-AP - Imaging Bay, Inc. | — | — | 0 |
| AS141348JP | BAYERHOLDINGLTD-AS-AP - Bayer Holding Ltd. | — | — | 0 |