AS18121

Name: AS18121 — Ishikawa Computer Center Co.,LTD.
Creator: ipdex

Ishikawa Computer Center Co.,LTD. ISP registered in Japan

6IPv4 prefixes

1IPv6 prefixes

71%RPKI-valid

#19,294AS Rank

326/327RIS visibility

#326Rank in Japan

2002-03-21Allocated

Ishikawa Computer Center Co.,LTD. (AS18121) — ISP, registered in Japan. announces 6 IPv4 prefixes + 1 IPv6 prefixes. Rank in Japan: #326. Allocated: 2002-03-21.

IPv4 6IPv6 1

Announced prefixes · 7

v4 103.241.208.0/23 unknown
v4 103.241.208.0/24 unknown
v4 180.94.192.0/20 valid
v4 180.94.208.0/21 valid
v4 202.222.32.0/19 valid
v4 219.121.224.0/19 valid
v6 2404:a00::/32 valid

RPKI: rpki.cloudflare.com · 2026-06-17

Routing: 6 IPv4 · 1 IPv6 announced · RIS visibility 326/327 RIS peers · RIPEstat · 2026-06-17

Prefix history

Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)

Data table

Day	Announced prefixes
2026-06-12	7
2026-06-13	7

Internet Exchanges · 5

JPNAP Tokyo Tokyo 100 Gbps
BBIX Osaka Osaka 20 Gbps
BBIX Tokyo Tokyo 20 Gbps
JPIX OSAKA Osaka 20 Gbps
JPIX TOKYO Tokyo 20 Gbps

AS topology · Customer cone 1

Providers · 3

AS2497 Internet Initiative Japan Inc.
AS17676 SoftBank Corp.
AS2518 BIGLOBE Inc.

Peers · 13

AS9002 RETN Limited
AS20485 Joint Stock Company TransTeleCom
AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC
AS1828 Unitas Global
AS24482 SG.GS
AS2500 WIDE Project

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