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Japan (JP)RPKI 57%

Ranked #3 worldwide by IPv4 address space.

IPv4 held

188.7M

11.2 × /8

IPv6 held

669.9M

/48 blocks

AS numbers

275

allocated

World rank

by IPv4

Deep profile

How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.

All rankings →

Dark IPv4

#4 of 241

Allocated but unrouted

Net buyer

+2.5M

Net buyer · #9 of 241

RPKI rank

#27 of 49

By IPv4 ROA coverage

Per-capita rank

#16 of 241

1.52 IPs / person

IPv6 adoption

APNIC-measured end-user deployment.

Capable60.4%

Preferred58.4%

Routing hygiene

Clean prefixes (valid RPKI + IRR, no mismatch).

64/100

1,250 clean of 13,245 prefixes

10 RPKI-invalid

Resource history

Cumulative IPv4, IPv6, and ASN allocations to Japan over time.

Top 10 local networks

The largest autonomous systems registered to Japan by IPv4 footprint.

All networks →

AS	Holder	IPv4	Prefixes
AS17676JP	GIGAINFRA - SoftBank Corp.	48.4M	466
AS4713JP	OCN - NTT DOCOMO BUSINESS,Inc.	28.6M	186
AS2516JP	KDDI - KDDI CORPORATION	18.2M	570
AS9824JP	JTCL-JP-AS - JCOM Co., Ltd.	10.3M	293
AS2907JP	SINET-AS - Research Organization of Information and Systems, National Institute of Informatics	9M

Routing security (RPKI)

Share of announced address space covered by valid Route Origin Authorizations.

ipv4RPKI 57%

4,775 valid9 invalid7,067 not found106.5M / 185.7M addrs

ipv6RPKI 84%

692 valid1 invalid701 not found434.4M / 514.6M addrs

Networks in this country

1,297 autonomous systems registered to Japan. Click an AS for detail.

AS	Holder	IPv4 ↓	IPv6 /48	Prefixes
AS55380JP	KAINS - Kanazawa University	65.5K	—	1
AS18125JP	MAFFIN - Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat, Ministry of Agriculture, Forestry and Fisheries	65.5K	—	1
AS9991JP	SHUDO-U - Hiroshima Shudo University	65.5K	1	2