$ 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)
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