The Mastermind Holding B.V.

Data as of 2026-07-26
BGP inherited
Cluster stats
Netblocks34 · 5,120 IPv4 addresses
IPv6 16 prefixes (largest 2a07:2c00::/29)
Registered in Netherlands (8) · Germany (5) · Austria (3) · United Kingdom (2) · United States (2) · Hungary (1)
Cluster ID213480501
RegistryAPNIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 26 shared RIR contact/maintainer handles
Registry names 3 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

6 weekly snapshots · JSON
40 +1 netblocks since 2026-07-05
2026-07-05 peak 40 2026-07-26

IP Ranges (34)

⬇ export CSV
CIDR Org name Registry Status Confidence
45.43.66.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
45.93.119.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
45.139.163.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
77.90.23.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
103.163.186.0/23 The Mastermind Holding B.V. BGP ANNOUNCED ● high
103.163.186.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
178.18.154.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
178.18.155.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
178.218.145.0/24 The Mastermind Holding B.V. RIPE SUB-ALLOCATED PA ● high
185.150.96.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
185.249.217.0/24 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a07:2c00::/29 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:46c3:700::/40 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:fd40::/29 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:fd40:be10::/48 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:fd40:be30::/48 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:fd45:1040::/48 The Mastermind Holding B.V. RIPE ASSIGNED ● high
2a0e:fd45:2cb0::/48 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a0e:fd45:2f70::/48 The Mastermind Holding B.V. BGP ANNOUNCED ● high
2a11:2::/32 The Mastermind Holding B.V. BGP ANNOUNCED ● high
45.146.6.0/23 The Mastermind Holding B.V. RIPE ALLOCATED PA ● low
45.146.7.0/24 The Mastermind Holding B.V. RIPE ALLOCATED PA ● low
103.166.228.0/23 The Mastermind Holding B.V. APNIC ALLOCATED PORTABLE ● low
178.18.152.0/22 The Mastermind Holding B.V. RIPE ASSIGNED PA ● low
185.235.144.0/24 The Mastermind Holding B.V. RIPE ALLOCATED PA ● low
185.251.234.0/24 The Mastermind Holding B.V. RIPE ASSIGNED PA ● low
188.64.138.0/24 The Mastermind Holding B.V. RIPE ALLOCATED PA ● low
2001:df6:9b80::/48 The Mastermind Holding B.V. APNIC ASSIGNED PORTABLE ● low
2a09:be40::/32 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low
2a09:bfc0::/29 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low
2a0d:8d05::/32 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low
2a0d:8d06::/31 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low
2a10:84c0::/29 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low
2a11:1::/32 The Mastermind Holding B.V. RIPE ALLOCATED-BY-RIR ● low

IPv6 ranges (16)

showing the 15 largest allocations
CIDR
2a07:2c00::/29
2a09:bfc0::/29
2a0e:fd40::/29
2a10:84c0::/29
2a0d:8d06::/31
2a09:be40::/32
2a0d:8d05::/32
2a11:1::/32
2a11:2::/32
2a0e:46c3:700::/40
2001:df6:9b80::/48
2a0e:fd40:be10::/48
2a0e:fd40:be30::/48
2a0e:fd45:1040::/48
2a0e:fd45:2cb0::/48

Network trust

what's this?
RPKI hygiene: D how networks compare →
45.0% of checked blocks have valid RPKI ROA coverage (18 of 40)
Possible discrepancies (2)

These blocks are registered to The Mastermind Holding B.V. 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.

185.251.234.0/24 /24 authorized for AS16276 — OVH SAS
45.146.7.0/24 /24 authorized for AS49981 — WorldStream B.V.

NIC Handles

AD APNIC-HM AS12586 AS44103 AT1577-AP DUMY-RIPE DUMY-RIPE GHOSTNET-MNT GHOSTNET-MNT GN-RIPE MEER-MNT MNT-HOSTUS +14 more