Shu Yoshikawa
BGP inherited
Cluster stats
Netblocks8
All fragments 102 blocks across 25 clusters
Cluster ID191828564
RegistryAPNIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 18 shared RIR contact/maintainer handles
Registry names 6 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

Footprint over time

2 weekly snapshots · JSON
8 0 netblocks since 2026-07-05
2026-07-05 peak 8 2026-07-06

IP Ranges (8)

⬇ export CSV
CIDR Org name Registry Status Confidence
122.226.201.32/30 SHU-WEI APNIC ASSIGNED NON-PORTABLE ● high
122.227.168.56/30 SHU-CAI APNIC ASSIGNED NON-PORTABLE ● high
2a06:41:c020::/48 Shu Yoshikawa RIPE ASSIGNED ● high
2a06:41:c021::/48 Shu Yoshikawa RIPE ASSIGNED ● high
218.247.131.88/29 SHU-ZI-SHI-JIE-BAO APNIC ASSIGNED NON-PORTABLE ● low
218.247.160.0/24 SHU-MA-DA-SHA APNIC ASSIGNED NON-PORTABLE ● low
219.239.212.104/30 SHU-MA-DA-SHA APNIC ASSIGNED NON-PORTABLE ● low
2001:630:60::/48 SHU-IPV6 RIPE ASSIGNED ● low

Network trust

what's this?
RPKI hygiene: A how networks compare →
100.0% of checked blocks have valid RPKI ROA coverage (8 of 8)
Possible discrepancies (4)

These blocks are registered to Shu Yoshikawa but cryptographically authorized for a different, unrelated network (3 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2001:630:60::/48 /48 authorized for AS786 — Jisc Services Limited
2a06:41:c021::/48 /48 authorized for AS49867 — Shuji Ito
2a06:41:c020::/48 /48 authorized for AS49867 — Shuji Ito
218.247.160.0/24 /24 authorized for AS4808 — China Unicom

NIC Handles

AC1602-AP ACRO64811-RIPE CJ54-AP CN13-AP Comet-MNT DUMY-RIPE DUMY-RIPE JANET-HOSTMASTER MAINT-CN-CHINANET-ZJ-JH MAINT-CN-CHINANET-ZJ-NB MAINT-CN-DXTNET MAINT-CNNIC-AP +6 more