Autonomous System
AS25151 Cyso Group B.V.
HostingActiveNetherlandsRIPE
AS25151 (CYSO-AS) is a hosting network operated by Cyso Group B.V. in Netherlands, registered with RIPE. It has 15 IPv4 prefixes with 15,872 addresses and 3 IPv6 prefixes, which makes it the 8,016th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses15,872in 15 prefixes
IPv6 prefixes3≈ 7.1 × 10²⁹ addresses
Size rank#8,016of 82,200 active ASNs
Details
OrganizationCyso Group B.V. · hosting provider profile
AS nameCYSO-AS
Websitecyso.com
Country Netherlands (NL)
Network typeHosting
RegistryRIPE
Abuse contactabuse@cyso.net
Registered2002-09-16
Last updated2026-07-16
IPv4 prefixes
15 prefixes · 15,872 addresses| Network | Addresses | First – last address |
|---|---|---|
| 81.24.0.0/20 | 4,096 | 81.24.0.0 – 81.24.15.255 |
| 37.46.136.0/21 | 2,048 | 37.46.136.0 – 37.46.143.255 |
| 85.158.200.0/21 | 2,048 | 85.158.200.0 – 85.158.207.255 |
| 93.94.224.0/21 | 2,048 | 93.94.224.0 – 93.94.231.255 |
| 109.235.72.0/21 | 2,048 | 109.235.72.0 – 109.235.79.255 |
| 185.54.112.0/22 | 1,024 | 185.54.112.0 – 185.54.115.255 |
| 80.85.160.0/23 | 512 | 80.85.160.0 – 80.85.161.255 |
| 2.57.56.0/24 | 256 | 2.57.56.0 – 2.57.56.255 |
| 37.72.138.0/24 | 256 | 37.72.138.0 – 37.72.138.255 |
| 45.134.223.0/24 | 256 | 45.134.223.0 – 45.134.223.255 |
| 62.129.139.0/24 | 256 | 62.129.139.0 – 62.129.139.255 |
| 62.129.149.0/24 | 256 | 62.129.149.0 – 62.129.149.255 |
| 130.193.5.0/24 | 256 | 130.193.5.0 – 130.193.5.255 |
| 185.123.55.0/24 | 256 | 185.123.55.0 – 185.123.55.255 |
| 193.33.220.0/24 | 256 | 193.33.220.0 – 193.33.220.255 |
81.24.0.0/20 37.46.136.0/21 85.158.200.0/21 93.94.224.0/21 109.235.72.0/21 185.54.112.0/22 80.85.160.0/23 2.57.56.0/24 37.72.138.0/24 45.134.223.0/24 62.129.139.0/24 62.129.149.0/24 130.193.5.0/24 185.123.55.0/24 193.33.220.0/24
IPv6 prefixes
3 prefixes- 2a05:6cc0::/29
- 2a01:518::/32
- 2001:678:c50::/48
2a05:6cc0::/29 2a01:518::/32 2001:678:c50::/48
Query AS25151 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS25151&key=YOUR_API_KEY"Any address in its prefixes resolves to AS25151, with or without a key:
curl "https://api.ipapi.is/?q=81.24.0.1"Largest networks in Netherlands
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