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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.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 7.4K |
| — |
| 29 |
| AS17948JP | EditNet - EditNet, Incorporated | 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 |
| 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 |
| AS146969JP | SBT-SC - SoftBank Corp. | 6.4K | 65.5K | 7 |
| AS10015JP | CWJ-NET - Cyber Wave Japan Co., Ltd. | 6.4K | — | 3 |
| AS63772JP | EXTRIDE-NET - extride inc. | 6.4K | — | 4 |
| AS63783JP | CUC - Chiba University of Commerce | 6.1K | — | 7 |
| AS23613JP | NMTNET - New Media Tokushima Co.,ltd. | 6.1K | — | 2 |
| AS58788JP | CHIRORO - Chiroro-Net Co.,Ltd. | 6.1K | — | 3 |
| 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 |
| AS18264JP | SEN - Seikei Eizo Network Inc. | 6.1K | — | 4 |
| AS23776JP | NEC - NEC Corporation | 6.1K | 65.5K | 3 |
| AS131949JP | ASO-NET - General Incorporated Foundation Aso Telework Center | 6.1K | 65.5K | 4 |
| AS59094JP | S2-NET - esu2 Corporation | 6.1K | — | 6 |
| AS23631JP | KISNET - Sofu System, Inc | 6.1K | 65.5K | 3 |
| AS38651JP | Mixi - MIXI, Inc. | 6.1K | 65.5K | 6 |
| AS18088JP | QIC - Kyuden Infocom Company Inc | 6.1K | — | 2 |
| AS131954JP | LCNet - Kawaguchiko cable television Inc | 6.1K | 65.5K | 6 |
| AS55902JP | TS-NET - TS-NET of TOSET, Inc. in Japan | 6.1K | — | 15 |
| AS17680JP | SCS - SCSK Corporation | 6.1K | — | 2 |
| AS139076JP | ENJOYVC-AS-AP - EnjoyVC Japan Corporation | 5.9K | 1 | 18 |
| AS137445JP | AS-PFLINK-JP - PF LINK SYSTEMS | 5.9K | — | 11 |
| AS152868JP | THX-NET - THX Corp. | 5.9K | — | 22 |
| AS24284JP | CYBERAGENT - CyberAgent, Inc. | 5.6K | 1 | 9 |
| AS131893JP | RICOH-NET - RICOH Company, Ltd. | 5.6K | 3 | 25 |
| AS17937JP | NDMC - NIKKEI ADVANCED SYSTEMS INC. | 5.4K | 65.5K | 4 |
| AS59116JP | AIGTKK - AIG Technologies KK | 5.4K | 7 | 17 |
| AS37907JP | DIGIROCK - DigiRock, Inc. | 5.1K | — | 3 |
| 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 |
| AS131896JP | SSI-Lab - SSI Lab Inc. | 4.6K | — | 11 |
| AS37897JP | ANW-NET-AS - AXEL ENTERMEDIA, INC. | 4.6K | 65.5K | 3 |
| AS59118JP | FNC-O2 - NRI SecureTechnologies, Ltd. | 4.6K | — | 4 |
| AS55897JP | SAKURA-F - SAKURA Internet Inc. | 4.4K | — | 2 |
| AS37914JP | Univnet - Advanced Software Technology and Management Research Institute of KYOTO | 4.4K | — | 2 |
| AS131899JP | DIG-NET - DIG Inc. | 4.4K | — | 11 |