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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 |
| — |
| 6 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS131960JP | MBO-NET - MBO holdings Inc. | 7.7K | — | 6 |
| AS23827JP | ANC-Net - Azumino Network Community TV | 7.7K | 65.5K | 5 |
| AS17948JP | EditNet - EditNet, Incorporated | 7.2K | 65.5K | 4 |
| AS17693JP | NEKONET - YAMATO SYSTEM DEVELOPMENT CO., LTD. | 7.2K | 65.5K | 5 |
| AS38638JP | IP-CORE - Ip Core Corporation | 6.7K | — | 26 |
| AS55376JP | KCV-HitaNet - KCV Communications Co. Ltd. | 6.7K | — | 4 |
| AS131896JP | SSI-Lab - SSI Lab Inc. | 6.7K | — | 13 |
| AS139468JP | DCI-AS-AP - DC Communications Inc. | 6.7K | 65.5K | 13 |
| AS142622JP | DIL-AS-AP - Dream Information Laboratory | 6.4K | — | 25 |
| AS146969JP | SBT-SC - SoftBank Corp. | 6.4K | 65.5K | 7 |
| AS63772JP | EXTRIDE-NET - extride inc. | 6.4K | — | 4 |
| AS10015JP | CWJ-NET - Cyber Wave Japan Co., Ltd. | 6.4K | — | 3 |
| AS17509JP | STARNET - STARNET Co.,Ltd. | 6.4K | 65.5K | 5 |
| AS55902JP | TS-NET - TS-NET of TOSET, Inc. in Japan | 6.1K | — | 15 |
| AS23776JP | NEC - NEC Corporation | 6.1K | 65.5K | 3 |
| AS58788JP | CHIRORO - Chiroro-Net Co.,Ltd. | 6.1K | — | 3 |
| AS17680JP | SCS - SCSK Corporation | 6.1K | — | 2 |
| AS59094JP | S2-NET - esu2 Corporation | 6.1K | — | 6 |
| AS23613JP | NMTNET - New Media Tokushima Co.,ltd. | 6.1K | — | 2 |
| AS63771JP | BGPNAP - Border Gateway Protocol Network Analysis Project | 6.1K | 327.7K | 22 |
| AS38651JP | Mixi - MIXI, Inc. | 6.1K | 65.5K | 6 |
| AS18088JP | QIC - Kyuden Infocom Company Inc | 6.1K | — | 2 |
| AS23641JP | NSCS-NET - NS Computer Service Corporation | 6.1K | 65.5K | 3 |
| AS139076JP | ENJOYVC-AS-AP - EnjoyVC Japan Corporation | 6.1K | 1 | 19 |
| AS131949JP | ASO-NET - General Incorporated Foundation Aso Telework Center | 6.1K | 65.5K | 4 |
| AS23631JP | KISNET - Sofu System, Inc | 6.1K | 65.5K | 3 |
| AS18264JP | SEN - Seikei Eizo Network Inc. | 6.1K | — | 4 |
| AS131954JP | LCNet - Kawaguchiko cable television Inc | 6.1K | 65.5K | 6 |
| AS137445JP | AS-PFLINK-JP - PF LINK SYSTEMS | 5.9K | — | 11 |
| AS131893JP | RICOH-NET - RICOH Company, Ltd. | 5.6K | 3 | 25 |
| AS37907JP | DIGIROCK - DigiRock, Inc. | 5.6K | — | 5 |
| AS24284JP | CYBERAGENT - CyberAgent, Inc. | 5.6K | 1 | 9 |
| AS17937JP | NDMC - NIKKEI ADVANCED SYSTEMS INC. | 5.4K | 65.5K | 4 |
| AS59116JP | AIGTKK - AIG Technologies KK | 5.4K | 7 | 17 |
| AS37916JP | atworks - A.T.WORKS, Inc. | 5.1K | — | 3 |
| AS9353JP | MEDIAWARS - MEDIAWARS co.,ltd. | 5.1K | — | 2 |
| AS211121JP | India Toko Communications Co., Ltd. | 5.1K | — | 5 |
| AS63775JP | YCTNET - YAKAGE CABLE TELEVISION | 5.1K | — | 5 |
| AS24270JP | CRC-KCC - CRC Solutions Corp., | 5.1K | 65.5K | 4 |
| AS7521JP | MFEED - INTERNET MULTIFEED CO. | 4.9K | 65.5K | 9 |
| AS23614JP | I-KOCHI - Kochi Systems Co., Ltd. | 4.9K | — | 5 |
| AS17685JP | PLAYONLINE - SQUARE ENIX CO., LTD. | 4.9K | — | 4 |
| AS37897JP | ANW-NET-AS - AXEL ENTERMEDIA, INC. | 4.6K | 65.5K | 3 |
| AS59123JP | KAKAKUCOM - Kakaku.com, Inc. | 4.6K | 65.5K | 10 |
| AS59118JP | FNC-O2 - NRI SecureTechnologies, Ltd. | 4.6K | — | 4 |