AS2852: the CESNET2 network
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Testar grátis 14 dias →AS2852 is an internet Autonomous System operated by CESNET2 (Czechia). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS2852?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS2852 was assigned to CESNET2 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS2852 currently announces 20 IPv4 block(s), totaling about 849.9 thousand addresses (849,920 in all), registered in Czechia. Services from CESNET2 are reached through these addresses.
What it means to see AS2852 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS2852. That means the other end sits on the CESNET2 network (Czechia). It can be legitimate — a cloud service, an ISP, a CDN — or an unexpected connection worth checking.
How to see every connection and network your devices reach
Tracing one connection's ASN at a time is tedious. Sentinela, by PC Monitor, maps the devices on your network, shows what is exposed to the internet and helps flag suspicious connections and devices — running on your Windows. Meet Sentinela.
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Perguntas frequentes
Who owns AS2852?
AS2852 is assigned to CESNET2, registered in Czechia.
What is an ASN (Autonomous System)?
It is a unique number identifying a network with its own routing policy on the internet. RIRs (regional registries) assign these numbers to carriers, ISPs and companies.
How many IP addresses does AS2852 control?
AS2852 currently announces about 849.9 thousand routed IPv4 addresses.