AS39761: the ABAK network
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Testar grátis 14 dias →AS39761 is an internet Autonomous System operated by ABAK (Czechia). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS39761?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS39761 was assigned to ABAK by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS39761 currently announces 6 IPv4 block(s), totaling about 10.2 thousand addresses (10,240 in all), registered in Czechia. Services from ABAK are reached through these addresses.
What it means to see AS39761 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS39761. That means the other end sits on the ABAK 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 AS39761?
AS39761 is assigned to ABAK, 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 AS39761 control?
AS39761 currently announces about 10.2 thousand routed IPv4 addresses.