CTK

BGP inherited
Cluster stats
Netblocks6 · 10,507 IPv4 addresses
Registered in Japan (3) · Germany (1) · SI (1)
All fragments 19 blocks across 14 clusters
Cluster ID208841590
RegistryAPNIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 7 shared RIR contact/maintainer handles
Registry names 3 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

Footprint over time

3 weekly snapshots · JSON
6 0 netblocks since 2026-07-12
2026-07-12 peak 6 2026-07-19

IP Ranges (6)

⬇ export CSV
CIDR Org name Registry Status Confidence
85.10.222.224/28 CTK-GMBH RIPE ASSIGNED PA ● low
125.2.208.0/20 CTK APNIC ALLOCATED PORTABLE ● low
193.2.9.0/24 CTK-NET RIPE ASSIGNED PA ● low
203.104.112.0/20 CTK APNIC ALLOCATED PORTABLE ● low
203.110.224.0/21 CTK APNIC ALLOCATED PORTABLE ● low
2a01:4f8:d1:3800::/56 CTK-GMBH RIPE ASSIGNED ● low

Possibly related to this organisation

what's this?
Same name family
Separately-registered clusters whose names share “CTK” — often per-country or per-system registrations of the same brand, occasionally a different organisation sharing the name. Not counted in this organisation's own footprint.
Combined view of all 14 name-family clusters →

Network trust

what's this?
RPKI hygiene: A how networks compare →
100.0% of checked blocks have valid RPKI ROA coverage (6 of 6)
Possible discrepancies (4)

These blocks are registered to CTK but cryptographically authorized for a different, unrelated network (2 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

203.104.112.0/20 /20 authorized for AS17936 — Cable Television Kani Co.,Ltd.
125.2.208.0/20 /20 authorized for AS17936 — Cable Television Kani Co.,Ltd.
203.110.224.0/21 /21 authorized for AS17936 — Cable Television Kani Co.,Ltd.
193.2.9.0/24 /24 authorized for AS2107 — ARNES

NIC Handles

ARNES-MNT DUMY-RIPE DUMY-RIPE HOS-GUN JNIC1-AP JNIC1-AP MAINT-JPNIC