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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 |
| 1.5K |
| — |
| 6 |
| AS18139JP | HISOL-CSV - Hitachi Solutions, Ltd. | 1.5K | 65.5K | 7 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS63793JP | OPSBETTER - Japan OPS Better Co., Ltd. | 1.5K | 65.5K | 6 |
| AS131910JP | SORACOM - SORACOM. INC. | 1.5K | 65.5K | 4 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.5K | 273 | 9 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS51044JP | RHE Kazuki Yamaguchi | 1.5K | 131.1K | 21 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS54415JP | WIZ-JP-AS-AP - WIZ K.K. | 1.3K | 6 | 11 |
| 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 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 1.3K | 65.5K | 3 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS7500JP | M-ROOT-DNS - WIDE Project | 1.3K | 65.5K | 5 |
| AS151195JP | NGIKK-AS-AP - Nova Global ICT Kabushiki Kaisha | 1.3K | — | 2 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 321 | 5 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 1.3K | — | 3 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS152324JP | M3XNETCOLTD-AS-AP - 3XNET Co., Ltd. | 1K | — | 4 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS55382JP | HOT-CHA - Nagato city office | 1K | — | 1 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1K | — | 4 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS153929JP | ABI-AS-AP - Allied Business Inc. | 1K | 256 | 5 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS131160JP | WI2 - Wire and Wireless Co.,Ltd. | 1K | 65.5K | 2 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | — | 1 |
| AS151388JP | SE-JIKKEN-AS - SoftEther Corporation (SE-JIKKEN-AS) | 1K | 514 | 8 |