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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 |
| 1.5K |
| 1 |
| 3 |
| AS63789JP | NEXT-WEB - NeXtWEB Corporation | 1.5K | — | 3 |
| AS133203JP | SBIBITS-JP - SBI BITS Co., Ltd. | 1.5K | — | 5 |
| AS51044JP | RHE Kazuki Yamaguchi | 1.5K | 131.1K | 21 |
| AS18258JP | MS-JP-AS-AP - Morgan Stanley Japan Limited | 1.5K | — | 6 |
| AS54415JP | WIZ-JP-AS-AP - WIZ K.K. | 1.5K | 7 | 13 |
| AS131910JP | SORACOM - SORACOM. INC. | 1.5K | 65.5K | 4 |
| AS7527JP | JPIX - Japan Internet Xing Co., Ltd. | 1.5K | 65.5K | 3 |
| AS150367JP | CLOUD-NET - Future Corp. | 1.5K | — | 6 |
| 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 |
| AS24257JP | JPIX-64ES - Japan Internet Xing Co., Ltd. | 1.5K | 3 | 8 |
| AS131982JP | UBC - Uenohara Broadband Communications Inc. | 1.5K | 65.5K | 3 |
| AS131917JP | TOSHIBA-IS - Toshiba I.S. corp | 1.3K | — | 5 |
| AS59129JP | LOGICLINKS - LogicLinks, Inc. | 1.3K | — | 3 |
| AS63801JP | DODO-NET - DODO K.K. | 1.3K | — | 4 |
| AS63773JP | DUAL-NET - dual&Co. Inc. | 1.3K | 65.5K | 4 |
| AS18072JP | STREAMWING - NTT DOCOMO BUSINESS, Inc. | 1.3K | — | 5 |
| AS131912JP | CYBOZU - Cybozu,Inc. | 1.3K | 65.5K | 3 |
| AS152868JP | THX-NET - THX Corp. | 1.3K | — | 4 |
| AS146979JP | SUNDAICHI - University of Nagasaki | 1.3K | 1 | 6 |
| AS7667JP | KDDLAB - KDDI Research, Inc. | 1.3K | 65 | 4 |
| AS24291JP | MITSUI-NW - MITSUI & CO., LTD. | 1.3K | — | 4 |
| AS7674JP | GOFORS - NTT DOCOMO BUSINESS, Inc | 1.3K | 1 | 4 |
| AS131900JP | DIRECTORZ - Directorz Co.,Ltd. | 1.3K | 1 | 5 |
| AS142165JP | BOSCHCORPORATION-AS-AP - Bosch Corporation | 1.3K | 65.5K | 5 |
| AS37904JP | BBIX-NETWORK - BBIX, Inc. | 1.3K | 1 | 4 |
| AS55569JP | CRITEO-AS-AP - Criteo APAC | 1K | 8 | 12 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | — | 1 |
| AS131963JP | MCDR-KIX - MC Digital Realty, Inc. | 1K | 65.5K | 2 |
| AS59110JP | BPS - BPS Inc. | 1K | 65.5K | 2 |
| AS136586JP | INCOMMJAPANKK-AS-AP - InComm Japan K.K. | 1K | — | 3 |
| AS211252JP | AKARI-AS-JP Marushin K.K. | 1K | — | 2 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |
| AS55393JP | MIDOKURA - Midokura Japan K.K. | 1K | — | 4 |
| AS63799JP | GHOST - Ghost Network | 1K | 65.5K | 4 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS55382JP | HOT-CHA - Nagato city office | 1K | — | 1 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS18279JP | BUKKYO-U - Bukkyo University | 1K | — | 1 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |