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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 |
| 1.5K |
| 7 |
| 13 |
| AS150367JP | CLOUD-NET - Future Corp. | 1.5K | — | 6 |
| AS24280JP | HIS-TKIDC - Hitachi Systems, Ltd. | 1.5K | — | 2 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS131966JP | INET-NET - I-NET CORP. | 1.5K | — | 2 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS18139JP | HISOL-CSV - Hitachi Solutions, Ltd. | 1.5K | 65.5K | 7 |
| AS18258JP | MS-JP-AS-AP - Morgan Stanley Japan Limited | 1.5K | — | 6 |
| AS37893JP | TRADEWEB-TKO - Tradeweb Japan | 1.5K | — | 5 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS51044JP | RHE Kazuki Yamaguchi | 1.5K | 131.1K | 21 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS7500JP | M-ROOT-DNS - WIDE Project | 1.3K | 65.5K | 5 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 65 | 4 |
| AS24291JP | MITSUI-NW - MITSUI & CO., LTD. | 1.3K | — | 4 |
| AS148985JP | ANSYSJAPANKK-AS-AP - ANSYS Japan K.K. | 1.3K | — | 4 |
| AS146979JP | SUNDAICHI - University of Nagasaki | 1.3K | 1 | 6 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 1.3K | — | 3 |
| AS152324JP | M3XNETCOLTD-AS-AP - 3XNET Co., Ltd. | 1.3K | — | 5 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS401474JP | ENXO-NET-AS - ENXO LLC | 1K | — | 4 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1K | — | 4 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | — | 1 |
| AS131160JP | WI2 - Wire and Wireless Co.,Ltd. | 1K | 65.5K | 2 |
| AS63799JP | GHOST - Ghost Network | 1K | 65.5K | 4 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS59110JP | BPS - BPS Inc. | 1K | 65.5K | 2 |
| AS55569JP | CRITEO-AS-AP - Criteo APAC | 1K | 8 | 12 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |