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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS37889JP | JPARC-NET - J-PARC Center | 1.8K | — | 3 |
| AS38643JP | U-Cloud - UNIADEX, LTD. | 1.8K | — | 3 |
| AS131914JP | DD-NET - Rakuten Group, Inc. | 1.8K | — | 5 |
| AS139358JP | KANSUIUN-AS-AP - Kansuiun Co., Ltd | 1.8K | 273 | 10 |
| AS139345JP | HYVEMANAGEDHOSTINGCORPINC-AS-AP - Hyve Managed Hosting Corp Inc | 1.8K | 7 | 8 |
| AS4774JP | ABONE-AS - A-Bone by Internet Initiative Japan Inc. | 1.8K | — | 4 |
| AS152324JP | M3XNETCOLTD-AS-AP - 3XNET Co., Ltd. | 1.8K | — | 6 |
| AS55888JP | Nintatsu - Nintatsu Global Telecommunications Corporation | 1.7K | — | 6 |
| AS150367JP | CLOUD-NET - Future Corp. | 1.5K | — | 6 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS153929JP | ABI-AS-AP - Allied Business Inc. | 1.5K | 256 | 6 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS131966JP | INET-NET - I-NET CORP. | 1.5K | — | 2 |
| AS37893JP | TRADEWEB-TKO - Tradeweb Japan | 1.5K | — | 5 |
| AS24280JP | HIS-TKIDC - Hitachi Systems, Ltd. | 1.5K | — | 2 |
| AS131910JP | SORACOM - SORACOM. INC. | 1.5K | 65.5K | 4 |
| AS18123JP | SEIRYO - INAOKI EDUCATIONAL INSTITUTION | 1.5K | 1 | 3 |
| AS63793JP | OPSBETTER - Japan OPS Better Co., Ltd. | 1.5K | 65.5K | 6 |
| AS18139JP | HISOL-CSV - Hitachi Solutions, Ltd. | 1.5K | 65.5K | 7 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS54415JP | WIZ-JP-AS-AP - WIZ K.K. | 1.5K | 7 | 13 |
| AS63805JP | RIDC-NET - Ryobi Systems Co., Ltd. | 1.5K | 3 | 5 |
| AS51044JP | RHE Kazuki Yamaguchi | 1.5K | 131.1K | 21 |
| AS18258JP | MS-JP-AS-AP - Morgan Stanley Japan Limited | 1.5K | — | 6 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |
| AS24291JP | MITSUI-NW - MITSUI & CO., LTD. | 1.3K | — | 4 |
| AS146979JP | SUNDAICHI - University of Nagasaki | 1.3K | 1 | 6 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1.3K | — | 5 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS7500JP | M-ROOT-DNS - WIDE Project | 1.3K | 65.5K | 5 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 321 | 5 |
| AS24229JP | KOCHI-IX - IX-layers, Inc. | 1.3K | 65.5K | 3 |
| AS148985JP | ANSYSJAPANKK-AS-AP - ANSYS Japan K.K. | 1.3K | — | 4 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | 65.5K | 2 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |