AS203990: the ACC_EU network
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Testar grátis 14 dias →AS203990 is an internet Autonomous System operated by ACC_EU (the United States). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS203990?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS203990 was assigned to ACC_EU by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS203990 currently announces 1 IPv4 block(s), totaling 512 addresses (512 in all), registered in the United States. Services from ACC_EU are reached through these addresses.
What it means to see AS203990 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS203990. That means the other end sits on the ACC_EU network (the United States). 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 AS203990?
AS203990 is assigned to ACC_EU, registered in the United States.
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 AS203990 control?
AS203990 currently announces 512 routed IPv4 addresses.