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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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 4.6K |
| 65.5K |
| 7 |
| AS59123JP | KAKAKUCOM - Kakaku.com, Inc. | 4.6K | 65.5K | 10 |
| 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 |
| AS63775JP | YCTNET - YAKAGE CABLE TELEVISION | 5.1K | — | 5 |
| AS37916JP | atworks - A.T.WORKS, Inc. | 5.1K | — | 3 |
| AS37907JP | DIGIROCK - DigiRock, Inc. | 5.1K | — | 3 |
| AS9353JP | MEDIAWARS - MEDIAWARS co.,ltd. | 5.1K | — | 2 |
| AS24270JP | CRC-KCC - CRC Solutions Corp., | 5.1K | 65.5K | 4 |
| AS17937JP | NDMC - NIKKEI ADVANCED SYSTEMS INC. | 5.4K | 65.5K | 4 |
| AS59116JP | AIGTKK - AIG Technologies KK | 5.4K | 7 | 17 |
| AS139076JP | ENJOYVC-AS-AP - EnjoyVC Japan Corporation | 5.6K | 1 | 17 |
| AS24284JP | CYBERAGENT - CyberAgent, Inc. | 5.6K | 1 | 9 |
| AS131893JP | RICOH-NET - RICOH Company, Ltd. | 5.6K | 3 | 25 |
| AS137445JP | AS-PFLINK-JP - PF LINK SYSTEMS | 5.9K | — | 11 |
| AS23613JP | NMTNET - New Media Tokushima Co.,ltd. | 6.1K | — | 2 |
| AS17680JP | SCS - SCSK Corporation | 6.1K | — | 2 |
| AS23641JP | NSCS-NET - NS Computer Service Corporation | 6.1K | 65.5K | 3 |
| AS131954JP | LCNet - Kawaguchiko cable television Inc | 6.1K | 65.5K | 6 |
| AS59094JP | S2-NET - esu2 Corporation | 6.1K | — | 6 |
| AS38651JP | Mixi - MIXI, Inc. | 6.1K | 65.5K | 6 |
| AS131949JP | ASO-NET - General Incorporated Foundation Aso Telework Center | 6.1K | 65.5K | 4 |
| AS58788JP | CHIRORO - Chiroro-Net Co.,Ltd. | 6.1K | — | 3 |
| AS55902JP | TS-NET - TS-NET of TOSET, Inc. in Japan | 6.1K | — | 15 |
| AS23776JP | NEC - NEC Corporation | 6.1K | 65.5K | 3 |
| AS18264JP | SEN - Seikei Eizo Network Inc. | 6.1K | — | 4 |
| AS18088JP | QIC - Kyuden Infocom Company Inc | 6.1K | — | 2 |
| AS23631JP | KISNET - Sofu System, Inc | 6.1K | 65.5K | 3 |
| AS63771JP | BGPNAP - Border Gateway Protocol Network Analysis Project | 6.1K | 327.7K | 22 |
| 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 |
| AS17509JP | STARNET - STARNET Co.,Ltd. | 6.4K | 65.5K | 5 |
| AS139468JP | DCI-AS-AP - DC Communications Inc. | 6.4K | 65.5K | 12 |
| AS38638JP | IP-CORE - Ip Core Corporation | 6.7K | — | 26 |
| AS55376JP | KCV-HitaNet - KCV Communications Co. Ltd. | 6.7K | — | 4 |
| AS131899JP | DIG-NET - DIG Inc. | 6.7K | — | 14 |
| AS17948JP | EditNet - EditNet, Incorporated | 7.2K | 65.5K | 4 |
| AS17693JP | NEKONET - YAMATO SYSTEM DEVELOPMENT CO., LTD. | 7.2K | 65.5K | 5 |
| AS23827JP | ANC-Net - Azumino Network Community TV | 7.7K | 65.5K | 5 |
| AS131960JP | MBO-NET - MBO holdings Inc. | 7.7K | — | 6 |
| AS17518JP | SHIOJIRI - Shiojiri City | 8.2K | — | 1 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS45689JP | CONVIVIALNET - Convivial Net | 8.2K | 1 | 3 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |