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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 |
| BITISLE-WEST - Equinix Japan Enterprise K.K. |
| — |
| — |
| 0 |
| AS147311JP | NGNJC-AS-AP - Nevigate Global Network Japan Corporation | — | — | 0 |
| AS151027JP | TAO_SAO_PAULO3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS55375JP | SI-NET - SmartInsight Inc. | — | — | 0 |
| AS63803JP | AS63803-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131980JP | KINIKUNET - KADOKAWA CORPORATION | — | — | 0 |
| AS132726JP | SANYUNETCORP-JP - 5-3 Miyuki-cho | — | — | 0 |
| AS9377JP | AS9377-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17688JP | AS17688-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18073JP | AS18073-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131073JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS37984JP | CKADMIN-AS-JP - Chikushi Jogakuen University, Non-transit AS. | — | — | 0 |
| AS59114JP | RECRUIT - Recruit Co., Ltd. | — | — | 0 |
| AS131152JP | BBIX-L3RPX - BBIX,Inc. | — | — | 0 |
| AS150810JP | TAO_MONTREAL - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9361JP | AS9361-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4733JP | AS4733-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7666JP | OKIX-1 - Mitsubishi Corporation | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10005JP | AS10005-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151022JP | TAO_SYDNEY3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151381JP | AS151381-11 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS9909JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS7517JP | AS7517-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131947JP | NOS-SERVICE - Net One Systems Co., Ltd. | — | — | 0 |
| AS140642JP | WASABI-AS-AP - Wasabi Technologies Inc. | — | — | 0 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS4674JP | AS4674-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7523JP | TECHNOW - RICOH JAPAN Corporation | — | — | 0 |
| AS9603JP | AS9603-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17527JP | MEDIAS - CHITA MEDIAS NETWORK INC. | — | — | 0 |
| AS23800JP | AS23800-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 0 |
| AS146968JP | COMSQUARE - COMSQUARE Co.,Ltd. | — | — | 0 |
| AS150360JP | NTTE-WFL-AS - NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION | — | — | 0 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151069JP | AS-VMW-MEL - VMWare Incorporation | — | — | 0 |
| AS131979JP | ZIPNET - ZIP Telecom | — | — | 0 |
| AS10124JP | AMAZON-AP-RESOURCES-AS-AP-NRT - Amazon Data Services Japan KK | — | — | 0 |
| AS18288JP | AS18288-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18286JP | AS18286-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23663JP | YAHOO-BANGALORE-AS-AP - Yahoo Bangalore Network Monitoring Center | — | — | 0 |
| AS55389JP | JPNE - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS4734JP | AS4734-52 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7520JP | AS7520-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |