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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.
1,303 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. | 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 |
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| 0 |
| AS45846JP | FSW-Shiga-POP - Shiga area POP AS Number | — | — | 0 |
| AS7680JP | AS7680-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9379JP | AS9379-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS137508JP | JP-RAINBOW-20180312 Toko Communications Co., Ltd. | — | — | 0 |
| AS131962JP | AS131962-58 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS9996JP | KDDIIP-VPN - KDDI Corporation | — | — | 0 |
| AS151019JP | TAO_SINGAPORE3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS23617JP | AS23617-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152864JP | NTT-WEST-CCS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151032JP | TAO_SEATTLE - AT&T TAO Cloud Access Node | — | — | 0 |
| AS131078JP | KDDLAB-4OCT - KDDI Research, Inc. | — | — | 0 |
| AS151028JP | TAO_SYDNEY_LAB - AT&T TAO Cloud Access Node | — | — | 0 |
| AS141348JP | BAYERHOLDINGLTD-AS-AP - Bayer Holding Ltd. | — | — | 0 |
| AS131920JP | closip-2 - closip Inc. | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS150810JP | TAO_MONTREAL - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151377JP | SHR-OSA-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |
| AS152874JP | JONET - JONET | 256 | — | 1 |
| AS131964JP | CYBERHOME3 - FAMILYNET JAPAN CORPORATION | 256 | 1 | 2 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | 256 | — | 1 |
| AS23774JP | A-DNS-JP - Japan Registry Service Co., Ltd. | 256 | 65.5K | 2 |
| AS23833JP | MARUSAN-NET - Marusan Securities Co., LTD. | 256 | — | 1 |
| AS18069JP | SOFTBANK - SoftBank Corp. | 256 | — | 1 |
| AS131924JP | KAP-NET - Kansai Airports | 256 | 1 | 2 |
| AS23761JP | XPEDITE-AS-JP - Xpedite Systems | 256 | — | 1 |
| AS152869JP | ICJ-NET - ICJ, Inc. | 256 | — | 1 |
| AS214968JP | KNEE-NET-AS JIANG Zhirui | 256 | 4 | 5 |
| AS63800JP | SERVER-G - SERVER-G Group | 256 | 10 | 11 |
| AS132610JP | JPNIC-NET-JP - Japan Network Information Center | 256 | 1 | 2 |
| AS55890JP | SUNTORY - Suntory Business Systems Ltd. | 256 | — | 1 |
| AS138652JP | SGCOM-AS-AP - Super Godzilla Communications GK | 256 | 65.5K | 2 |
| AS59124JP | KYOTO-PREF - KYOTO Prefectural Government | 256 | — | 1 |
| AS146982JP | SHINNYO-LIVE - Shinnyo-en | 256 | — | 1 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS132119JP | TECPRESSO-NET-AP - TECPRESSO Inc. | 256 | 1 | 2 |
| AS134827JP | EYJAPAN-AS-AP - EY Japan Co., Ltd. | 256 | — | 1 |
| AS59111JP | AIU-NET - Akita International University | 256 | 1 | 2 |
| AS23642JP | OBIS - OBIS | 256 | 1 | 2 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 15 |
| AS63780JP | BIRDIE-NET - dual&Co. Inc. | 256 | 16.4K | 2 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |
| AS151376JP | SHR-TYO-NET - Solare Hotels and Resorts Co., Ltd. | 256 | — | 1 |