AS43258 — CSO

AS43258 announces 5 IPv4 prefixes covering 15,616 addresses and 0 IPv6 prefixes.

About this network

CSO is operated by Centr Servisnogo Oblslugovuvannya Ltd.

What it's used for

• The address space carries residential subscriber traffic, evidenced by reverse DNS entries such as user-91.245.119.254.cso.com.ua and user-188.191.75.254.cso.com.ua.
• The AS announces 15,616 IPv4 addresses across 5 prefixes and maintains 3 observed neighbours, a ratio indicative of an access network rather than a transit provider.
• Traffic consists of end-user internet access for subscribers in Ukraine, consistent with the operator's role as a local ISP.

Notable

• All registrants for the announced prefixes are listed as Centr Servisnogo Oblslugovuvannya Ltd, with netnames including CSO-NET, CSO-NET2, and CSO-NET3.
• The inventory is composed of five distinct IPv4 blocks, with the largest being 91.245.96.0/19.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 91.189.152.0/21
• 91.198.31.0/24
• 91.222.32.0/22
• 91.245.96.0/19
• 188.191.64.0/20

Upstream networks

• AS35297 Dataline LLC
• AS3255 LLC EKSINTECH

Adjacent networks

• AS35297 Dataline LLC
• AS3255 LLC EKSINTECH

Routing security

• RPKI: 0 valid, 0 invalid and 5 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 5 route objects.
• Listed in as-sets: AS-ACTPA, AS-DL-CLIENTS, AS-ETT, AS-HURRICANE, AS-RETN-ACTUAL-V4, AS-TRANSROUTE-SPEC, AS-UARNET, AS-UARNET-CLIENTS.