AS25151 — CYSO-AS Cyso Group B.V.

Network type: hosting

AS25151 announces 16 IPv4 prefixes covering 14,848 addresses and 3 IPv6 prefixes.

About this network

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, and vlan1047-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.

Announced prefixes

• 2.57.56.0/24
• 37.46.136.0/21
• 37.72.138.0/24
• 45.134.223.0/24
• 62.129.139.0/24
• 62.129.149.0/24
• 80.85.160.0/23
• 81.24.0.0/21
• 81.24.8.0/22
• 85.158.200.0/21
• 93.94.224.0/21
• 109.235.72.0/21
• 130.193.5.0/24
• 185.54.112.0/22
• 185.123.55.0/24
• 193.33.220.0/24
• 2001:678:c50::/48
• 2a01:518::/32
• 2a05:6cc0::/29

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS1299 Arelion Sweden AB
• AS2914 NTT America, Inc.
• AS6939 Hurricane Electric LLC
• AS200020 Stichting NBIP-NaWas
• AS50673 Serverius Holding B.V.
• AS42708 Glesys Sweden AB
• AS48185 team.blue NV
• AS37721 Virtual Technologies & Solutions
• AS24482 SG.GS
• AS33891 Core-Backbone GmbH
• AS37100 SEACOM Limited
• AS12552 GlobalConnect AB
• AS4657 StarHub Ltd
• AS48362 Stadtwerke Feldkirch
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS213241 TECHIT.BE SRL
• AS34019 Hivane Association
• AS50300 CustodianDC Limited
• AS34927 iFog GmbH
• AS3216 PJSC "Vimpelcom"
• AS12779 IT.Gate S.p.A.
• AS56655 Gigahost AS
• AS13030 Init7 (Switzerland) Ltd.
• AS17639 Converge ICT Solutions Inc.

Downstream networks

• AS15535 Virtual Access Internet BV
• AS210728 Cyso Group B.V.

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS1299 Arelion Sweden AB
• AS2914 NTT America, Inc.
• AS15535 Virtual Access Internet BV
• AS6939 Hurricane Electric LLC
• AS50673 Serverius Holding B.V.
• AS200020 Stichting NBIP-NaWas
• AS42708 Glesys Sweden AB
• AS210728 Cyso Group B.V.
• AS48185 team.blue NV
• AS33891 Core-Backbone GmbH
• AS37721 Virtual Technologies & Solutions
• AS24482 SG.GS
• AS4657 StarHub Ltd
• AS37100 SEACOM Limited
• AS12552 GlobalConnect AB
• AS48362 Stadtwerke Feldkirch
• AS50300 CustodianDC Limited
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS213241 TECHIT.BE SRL
• AS34019 Hivane Association
• AS12779 IT.Gate S.p.A.
• AS34927 iFog GmbH
• AS3216 PJSC "Vimpelcom"
• AS56655 Gigahost AS

Routing security

• RPKI: 14 valid, 0 invalid and 4 not-found announcements; 21 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 24 route objects.
• Listed in as-sets: AS-CYSO, AS-CYSONET, AS-DDITS:AS-PEERS, AS-DOCLER:AS-PEERS, AS-GREEN-PEERS, AS-HWNG-DOWNSTREAMS, AS-JAGUAR-PEERING-V6-NL-IX, AS-MANDA-AMSIX-PEERS-V4, AS-MANDA-AMSIX-PEERS-V6, AS-MZIMA-CUSTOMERS, AS-NFORCE-NL-IX-PEERS, AS-NLAYER-CUSTOMERS, AS-OXILION-PEERS, AS-SBN-IIG, AS1200:AS-AMS-IX-PEERS, AS20932:AS-PEERING, AS25091:AS-PEERS, AS28747:AS-NL-IX-PEERS, AS29075:AS-PEERS:AS-AMS-IX, AS29169:AS-PEERS4, AS29169:AS-PEERS6, AS30781:AS-JAGUAR-PEERING-AMS-IX, AS30781:AS-JAGUAR-PEERING-V6-AMS-IX, AS34968:AS-AMS-IX-PEERS, AS34968:AS-AMS-IX-V6-PEERS.

Internet exchanges

• AMS-IX Amsterdam — Amsterdam, Netherlands
• Neutral Internet Exchange — Amsterdam, Netherlands