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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 |
| FNC-O2 - NRI SecureTechnologies, Ltd. |
| 4.6K |
| — |
| 4 |
| AS59123JP | KAKAKUCOM - Kakaku.com, Inc. | 4.6K | 65.5K | 10 |
| AS37897JP | ANW-NET-AS - AXEL ENTERMEDIA, INC. | 4.6K | 65.5K | 3 |
| AS17685JP | PLAYONLINE - SQUARE ENIX CO., LTD. | 4.9K | — | 4 |
| AS23614JP | I-KOCHI - Kochi Systems Co., Ltd. | 4.9K | — | 5 |
| AS7521JP | MFEED - INTERNET MULTIFEED CO. | 4.9K | 65.5K | 9 |
| AS63775JP | YCTNET - YAKAGE CABLE TELEVISION | 5.1K | — | 5 |
| AS9353JP | MEDIAWARS - MEDIAWARS co.,ltd. | 5.1K | — | 2 |
| AS37916JP | atworks - A.T.WORKS, Inc. | 5.1K | — | 3 |
| AS24270JP | CRC-KCC - CRC Solutions Corp., | 5.1K | 65.5K | 4 |
| AS211121JP | India Toko Communications Co., Ltd. | 5.1K | — | 5 |
| AS17937JP | NDMC - NIKKEI ADVANCED SYSTEMS INC. | 5.4K | 65.5K | 4 |
| AS59116JP | AIGTKK - AIG Technologies KK | 5.4K | 7 | 17 |
| AS131893JP | RICOH-NET - RICOH Company, Ltd. | 5.6K | 3 | 25 |
| AS24284JP | CYBERAGENT - CyberAgent, Inc. | 5.6K | 1 | 9 |
| AS37907JP | DIGIROCK - DigiRock, Inc. | 5.6K | — | 5 |
| AS137445JP | AS-PFLINK-JP - PF LINK SYSTEMS | 5.9K | — | 11 |
| AS131949JP | ASO-NET - General Incorporated Foundation Aso Telework Center | 6.1K | 65.5K | 4 |
| AS59094JP | S2-NET - esu2 Corporation | 6.1K | — | 6 |
| AS63771JP | BGPNAP - Border Gateway Protocol Network Analysis Project | 6.1K | 327.7K | 22 |
| AS139076JP | ENJOYVC-AS-AP - EnjoyVC Japan Corporation | 6.1K | 1 | 19 |
| AS23776JP | NEC - NEC Corporation | 6.1K | 65.5K | 3 |
| AS17680JP | SCS - SCSK Corporation | 6.1K | — | 2 |
| AS18088JP | QIC - Kyuden Infocom Company Inc | 6.1K | — | 2 |
| AS58788JP | CHIRORO - Chiroro-Net Co.,Ltd. | 6.1K | — | 3 |
| AS18264JP | SEN - Seikei Eizo Network Inc. | 6.1K | — | 4 |
| AS131954JP | LCNet - Kawaguchiko cable television Inc | 6.1K | 65.5K | 6 |
| AS23641JP | NSCS-NET - NS Computer Service Corporation | 6.1K | 65.5K | 3 |
| AS55902JP | TS-NET - TS-NET of TOSET, Inc. in Japan | 6.1K | — | 15 |
| AS23613JP | NMTNET - New Media Tokushima Co.,ltd. | 6.1K | — | 2 |
| AS23631JP | KISNET - Sofu System, Inc | 6.1K | 65.5K | 3 |
| AS38651JP | Mixi - MIXI, Inc. | 6.1K | 65.5K | 6 |
| AS63772JP | EXTRIDE-NET - extride inc. | 6.4K | — | 4 |
| AS142622JP | DIL-AS-AP - Dream Information Laboratory | 6.4K | — | 25 |
| AS17509JP | STARNET - STARNET Co.,Ltd. | 6.4K | 65.5K | 5 |
| AS146969JP | SBT-SC - SoftBank Corp. | 6.4K | 65.5K | 7 |
| AS10015JP | CWJ-NET - Cyber Wave Japan Co., Ltd. | 6.4K | — | 3 |
| AS38638JP | IP-CORE - Ip Core Corporation | 6.7K | — | 26 |
| AS131896JP | SSI-Lab - SSI Lab Inc. | 6.7K | — | 13 |
| AS55376JP | KCV-HitaNet - KCV Communications Co. Ltd. | 6.7K | — | 4 |
| AS139468JP | DCI-AS-AP - DC Communications Inc. | 6.7K | 65.5K | 13 |
| AS17693JP | NEKONET - YAMATO SYSTEM DEVELOPMENT CO., LTD. | 7.2K | 65.5K | 5 |
| AS17948JP | EditNet - EditNet, Incorporated | 7.2K | 65.5K | 4 |
| AS23827JP | ANC-Net - Azumino Network Community TV | 7.7K | 65.5K | 5 |
| AS131960JP | MBO-NET - MBO holdings Inc. | 7.7K | — | 6 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS59091JP | KAIT-NWLAB - Kanagawa Institute of Technology | 8.2K | — | 1 |