AS43542 — OptoNet-AS OptoNet Communication, spol. s.r.o.

AS43542 announces 5 IPv4 prefixes covering 7,936 addresses and 1 IPv6 prefixes.

About this network

The AS handle OPTONET-AS is held by OptoNet Communication, spol. s.r.o.

What it's used for

• The address space carries residential and business internet access, evidenced by reverse DNS entries such as client-254-vynet.net, ip.143.126.user.trestsko.net, and host-141-64.ktvmb.cz.
• The network announces 7,936 IPv4 addresses across 5 prefixes and 1 IPv6 prefix, with 27 observed neighbours, indicating a regional access provider with moderate peering.
• Traffic from this AS consists of subscriber eyeballs, IP telephony, IPTV, and hosted web services, consistent with the operator's provision of internet connectivity, server rental, and cloud technologies.

Notable

• All registrants for the announced prefixes are OptoNet Communication, spol. s.r.o., matching the AS holder.
• The address inventory is concentrated in the 78.156.128.0/21 block, with smaller subdivisions for specific customer segments or services.

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

Announced prefixes

• 78.156.128.0/21
• 78.156.136.0/22
• 78.156.141.0/24
• 78.156.142.0/23
• 78.156.144.0/20
• 2a00:d940::/32

Upstream networks

• AS6855 Slovak Telekom, a.s.
• AS6939 Hurricane Electric LLC
• AS16019 Vodafone Czech Republic a.s.
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
• AS8218 Zayo Infrastructure France SA
• AS24482 SG.GS
• AS29504 Freenet Liberec, z.s.

Downstream networks

• AS207945 CNI Group s.r.o.
• AS202979 NGA Services, spol. s r.o.
• AS44104 LCJ Invest, a.s.
• AS48091 Kraj Vysocina

Adjacent networks

• AS6855 Slovak Telekom, a.s.
• AS207945 CNI Group s.r.o.
• AS6939 Hurricane Electric LLC
• AS202979 NGA Services, spol. s r.o.
• AS16019 Vodafone Czech Republic a.s.
• AS44104 LCJ Invest, a.s.
• AS29504 Freenet Liberec, z.s.
• AS8218 Zayo Infrastructure France SA
• AS24482 SG.GS
• AS48091 Kraj Vysocina
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH

Routing security

• RPKI: 2 valid, 0 invalid and 0 not-found announcements; 3 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 3 route objects.
• Listed in as-sets: AS-DIALTELECOM, AS-GTSCZ-CUST, AS-OPTONET-TRANSIT, AS8508:AS-SASK-UPC-IN.

Internet exchanges

• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic