Shu Yoshikawa

Data as of 2026-07-26
BGP inherited
Limited data: only 3 ranges found registered under this exact name. This may not reflect the organisation's full internet footprint — many companies' web and cloud infrastructure is hosted under a third-party provider's own registration rather than their own.
Cluster stats
Netblocks3
IPv6 3 prefixes (largest 2001:630:60::/48)
Cluster ID213638833
RegistryRIPE
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 7 shared RIR contact/maintainer handles
Registry names 2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

5 weekly snapshots · JSON
8 0 netblocks since 2026-07-05
2026-07-05 peak 8 2026-07-19

IP Ranges (3)

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CIDR Org name Registry Status Confidence
2a06:41:c020::/48 Shu Yoshikawa RIPE ASSIGNED ● high
2a06:41:c021::/48 Shu Yoshikawa RIPE ASSIGNED ● high
2001:630:60::/48 SHU-IPV6 RIPE ASSIGNED ● low

IPv6 ranges (3)

CIDR
2001:630:60::/48
2a06:41:c020::/48
2a06:41:c021::/48

Network trust

what's this?
RPKI hygiene: A how networks compare →
100.0% of checked blocks have valid RPKI ROA coverage (3 of 3)
Possible discrepancies (2)

These blocks are registered to Shu Yoshikawa but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a06:41:c021::/48 /48 authorized for AS49867 — Shuji Ito
2a06:41:c020::/48 /48 authorized for AS49867 — Shuji Ito
Routed via provider/NREN (1)

These blocks are cryptographically authorized for this organisation's national research & education network or transit provider — expected topology for an institution that routes through it, not a discrepancy.

2001:630:60::/48 /48 routed via AS786 — Jisc (Jisc Services Limited)

NIC Handles

ACRO64811-RIPE Comet-MNT DUMY-RIPE DUMY-RIPE JANET-HOSTMASTER Miu-MNT ORG-SY73-RIPE