$ query “AS25151” --type=asn → 1 result(s)

AS25151 — CYSO-AS

Cyso Group B.V.

AS25151 is a hosting access provider operated by Cyso Group B.V., based in the Netherlands since 2002. The network announces a respectable 15 872 IPv4 addresses. Supports IPv6.

Basic Information

Country
🇳🇱 Netherlands
Category
Hosting
Network Role
Access Provider
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
September 16, 2002
Last Changed
March 04, 2026
Last Seen
March 05, 2026

Prefix Summary

IPv4 Prefixes (raw / aggregated)
23 / 17
IPv6 Prefixes (raw / aggregated)
4 / 4
IPv4 Addresses
15 872
Largest IPv4 Prefix
/21 (2 048 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇳🇱 NL (26 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Pristine — 0 flagged IPs out of 15 872 total (0.00%)

Connectivity Summary

Upstream Providers
3 upstream autonomous systems providing transit
Peers
97 autonomous systems exchanging traffic without transit fees
Downstream Customers
2 downstream autonomous systems buying transit
Degree
105 unique BGP neighbors (providers + customers + peers)
Reach
3 — customer cone size measuring network influence
Degree Rank
#1 443
Reach Rank
#5 493

Upstream Providers (3)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (23 total)

  • 37.46.136.0/21 (2 048 addresses)
  • 81.24.0.0/21 (2 048 addresses)
  • 85.158.200.0/21 (2 048 addresses)
  • 93.94.224.0/21 (2 048 addresses)
  • 109.235.72.0/21 (2 048 addresses)
  • 81.24.8.0/22 (1 024 addresses)
  • 185.54.112.0/22 (1 024 addresses)
  • 185.78.196.0/22 (1 024 addresses)
  • 80.85.160.0/23 (512 addresses)
  • 2.57.56.0/24 (256 addresses)
  • 37.72.138.0/24 (256 addresses)
  • 45.134.223.0/24 (256 addresses)
  • 62.129.139.0/24 (256 addresses)
  • 62.129.149.0/24 (256 addresses)
  • 130.193.5.0/24 (256 addresses)
  • 185.123.55.0/24 (256 addresses)
  • 193.33.220.0/24 (256 addresses)

IPv6 Prefixes (4 total)

  • 2a05:6cc0::/29
  • 2a01:518::/32
  • 2001:678:c50::/48
  • 2001:67c:1724::/48