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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.
| 668 |
| 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 |
| 7.2K |
| 65.5K |
| 4 |
| AS17693JP | NEKONET - YAMATO SYSTEM DEVELOPMENT CO., LTD. | 7.2K | 65.5K | 5 |
| AS55376JP | KCV-HitaNet - KCV Communications Co. Ltd. | 6.7K | — | 4 |
| AS142622JP | DIL-AS-AP - Dream Information Laboratory | 6.7K | — | 26 |
| AS131896JP | SSI-Lab - SSI Lab Inc. | 6.7K | — | 13 |
| AS38638JP | IP-CORE - Ip Core Corporation | 6.7K | — | 26 |
| AS139468JP | DCI-AS-AP - DC Communications Inc. | 6.7K | 65.5K | 13 |
| AS17509JP | STARNET - STARNET Co.,Ltd. | 6.4K | 65.5K | 5 |
| AS10015JP | CWJ-NET - Cyber Wave Japan Co., Ltd. | 6.4K | — | 3 |
| AS63772JP | EXTRIDE-NET - extride inc. | 6.4K | — | 4 |
| AS146969JP | SBT-SC - SoftBank Corp. | 6.4K | 65.5K | 7 |
| AS131949JP | ASO-NET - General Incorporated Foundation Aso Telework Center | 6.1K | 65.5K | 4 |
| AS23776JP | NEC - NEC Corporation | 6.1K | 65.5K | 3 |
| AS63783JP | CUC - Chiba University of Commerce | 6.1K | — | 7 |
| AS23631JP | KISNET - Sofu System, Inc | 6.1K | 65.5K | 3 |
| AS18264JP | SEN - Seikei Eizo Network Inc. | 6.1K | — | 4 |
| AS18088JP | QIC - Kyuden Infocom Company Inc | 6.1K | — | 2 |
| AS58788JP | CHIRORO - Chiroro-Net Co.,Ltd. | 6.1K | — | 3 |
| AS23613JP | NMTNET - New Media Tokushima Co.,ltd. | 6.1K | — | 2 |
| AS139076JP | ENJOYVC-AS-AP - EnjoyVC Japan Corporation | 6.1K | 1 | 19 |
| AS55902JP | TS-NET - TS-NET of TOSET, Inc. in Japan | 6.1K | — | 15 |
| AS38651JP | Mixi - MIXI, Inc. | 6.1K | 65.5K | 6 |
| AS131954JP | LCNet - Kawaguchiko cable television Inc | 6.1K | 65.5K | 6 |
| AS17680JP | SCS - SCSK Corporation | 6.1K | — | 2 |
| AS63771JP | BGPNAP - Border Gateway Protocol Network Analysis Project | 6.1K | 327.7K | 22 |
| AS23641JP | NSCS-NET - NS Computer Service Corporation | 6.1K | 65.5K | 3 |
| AS59094JP | S2-NET - esu2 Corporation | 6.1K | — | 6 |
| AS137445JP | AS-PFLINK-JP - PF LINK SYSTEMS | 5.9K | — | 11 |
| AS37907JP | DIGIROCK - DigiRock, Inc. | 5.6K | — | 5 |
| AS24284JP | CYBERAGENT - CyberAgent, Inc. | 5.6K | 1 | 9 |
| AS131893JP | RICOH-NET - RICOH Company, Ltd. | 5.6K | 3 | 25 |
| AS59116JP | AIGTKK - AIG Technologies KK | 5.4K | 7 | 17 |
| AS17937JP | NDMC - NIKKEI ADVANCED SYSTEMS INC. | 5.4K | 65.5K | 4 |
| AS37916JP | atworks - A.T.WORKS, Inc. | 5.1K | — | 3 |
| AS9353JP | MEDIAWARS - MEDIAWARS co.,ltd. | 5.1K | — | 2 |
| 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 |
| AS59123JP | KAKAKUCOM - Kakaku.com, Inc. | 4.6K | 65.5K | 10 |
| AS37897JP | ANW-NET-AS - AXEL ENTERMEDIA, INC. | 4.6K | 65.5K | 3 |
| AS55912JP | u-kochi - University of Kochi | 4.6K | 65.5K | 5 |
| AS59118JP | FNC-O2 - NRI SecureTechnologies, Ltd. | 4.6K | — | 4 |
| AS37914JP | Univnet - Advanced Software Technology and Management Research Institute of KYOTO | 4.4K | — | 2 |
| AS55897JP | SAKURA-F - SAKURA Internet Inc. | 4.4K | — | 2 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |