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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 |
| 1K |
| 65.5K |
| 2 |
| AS63799JP | GHOST - Ghost Network | 1K | 65.5K | 4 |
| AS131940JP | BETANET - Nissho Electronics Corp. | 1K | — | 3 |
| AS151388JP | SE-JIKKEN-AS - SoftEther Corporation (SE-JIKKEN-AS) | 1K | 514 | 8 |
| AS18149JP | JPRS - Japan Registry Service Co., Ltd. | 1K | 2 | 5 |
| AS10209JP | Synopsys-AS-JP-AP - Japan HUB and Data Center | 1K | — | 3 |
| AS131953JP | YUTOPIA-NET - NPO Yutopianet | 1K | — | 3 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | — | 1 |
| AS37900JP | MATSURI - NTT DOCOMO BUSINESS, Inc. | 1K | 3 | 7 |
| AS131905JP | JPRS-GTLD - Japan Registry Services Co., Ltd. | 1K | 65.5K | 4 |
| AS59110JP | BPS - BPS Inc. | 1K | 65.5K | 2 |
| AS131946JP | MU-NET - MUSASHINO UNIVERSITY E.F. | 1K | — | 3 |
| AS55907JP | GMO-DNS-R1 - GMO Internet, Inc. | 1K | 3 | 7 |
| AS151195JP | NGIKK-AS-AP - Nova Global ICT Kabushiki Kaisha | 1.3K | — | 2 |
| AS148985JP | ANSYSJAPANKK-AS-AP - ANSYS Japan K.K. | 1.3K | — | 4 |
| AS7500JP | M-ROOT-DNS - WIDE Project | 1.3K | 65.5K | 5 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 1.3K | 65.5K | 3 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 321 | 5 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 1.3K | — | 3 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS24291JP | MITSUI-NW - MITSUI & CO., LTD. | 1.3K | — | 4 |
| AS54415JP | WIZ-JP-AS-AP - WIZ K.K. | 1.3K | 6 | 11 |
| AS146979JP | SUNDAICHI - University of Nagasaki | 1.3K | 1 | 6 |
| AS55569JP | CRITEO-AS-AP - Criteo APAC | 1.5K | 10 | 16 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS150367JP | CLOUD-NET - Future Corp. | 1.5K | — | 6 |
| AS18123JP | SEIRYO - INAOKI EDUCATIONAL INSTITUTION | 1.5K | 1 | 3 |
| AS131966JP | INET-NET - I-NET CORP. | 1.5K | — | 2 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS37893JP | TRADEWEB-TKO - Tradeweb Japan | 1.5K | — | 5 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.5K | 273 | 9 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS131910JP | SORACOM - SORACOM. INC. | 1.5K | 65.5K | 4 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS18139JP | HISOL-CSV - Hitachi Solutions, Ltd. | 1.5K | 65.5K | 7 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |