Japan holds 188,718,912 IPv4 addresses from APNIC, ARIN and RIPE NCC.
Regional registries have allocated 188,718,912 IPv4 addresses in 4,806 blocks, 788 IPv6 blocks and 1,304 network numbers to organisations in Japan, the first on 13 Jun 1983. By DB-IP’s count the largest network here is SoftBank Corp. (AS17676).
Registered here vs used here
The RIR count is what was allocated to organisations registered in Japan; DB-IP’s count is where it estimates addresses are used. DB-IP places 14,245,786 more IPv4 addresses in Japan than were allocated here, which happens when networks registered elsewhere (cloud providers, multinationals) operate in the country.
Largest networks by IPv4 space in Japan
IP Geolocation by DB-IP (ASN Lite × Country Lite, CC BY 4.0).
Allocations per year
Delegation records per year (IPv4 blocks + IPv6 blocks + ASN records) still current in the RIR files. Last 12 years shown.
Download the ranges
Every IPv4 and IPv6 range DB-IP Country Lite places in Japan, as CSV. The file carries DB-IP’s attribution, which you must keep if you republish it.
Sources
- NRO RIR delegated-extended statistics · checked 5 Nov 2026
- DB-IP IP to Country Lite (CC BY 4.0) · checked 3 Nov 2026