Autonomous system
AS25151 CYSO-AS
Hosting RIPE
Summary
Cyso
hosting business netherlands
The AS handle CYSO-AS is held by Cyso Group B.V.
What it's used for
- The address space carries hosting infrastructure, evidenced by reverse DNS entries such as
nw-vl1094.network.cyso.net,free.cyso.net, andvlan1047-bc.network.cyso.net. - With 14,848 IPv4 addresses announced across 16 prefixes and 105 observed neighbours, the ratio suggests a hosting or business network rather than a large-scale residential access provider.
Notable
- Registrants for the largest prefixes consistently list Cyso Hosting B.V. and Cyso Group B.V., aligning with the AS holder.
- Several smaller prefixes are registered to distinct entities including Fuga B.V., VWE Extranet Nederland, Realtime Register B.V., Harlem Next B.V., Bitmaster Online BV, and Virtual Access Internet BV, indicating leased or acquired space.
- The inventory includes a mix of /21, /22, /23, and /24 blocks, with the largest being 37.46.136.0/21 and 81.24.0.0/21.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.209.155 |
| Neutral Internet Exchange | Amsterdam, Netherlands | 193.239.116.36 |
Transit providers
27 upstream, 2 downstream and 40 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 16 prefixes · 14.85K addresses IPv6 3 prefixes
| Country | Name | Prefixes |
|---|---|---|
| NL | Netherlands | 19 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS25151- Registry name
- CYSO-AS
- Registrant
- CYSO-MNT
- Abuse contact
- abuse@cyso.net
- Registered
- 2002-09-16
- Last changed
- 2026-09-29
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 78% valid · 14 valid, 4 with no ROA
- ROAs
- 21 authorising AS25151
- ASPA
- no ASPA record
- IRR
- 100% registered · 18 of 18 announcements
- Route objects
- 24 naming AS25151
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,771 prefixes, as published 2026-10-15. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere