AS59891: the FSIT network
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Testar grátis 14 dias →AS59891 is an internet Autonomous System operated by FSIT (Switzerland). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS59891?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS59891 was assigned to FSIT by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS59891 currently announces 2 IPv4 block(s), totaling about 2 thousand addresses (2,048 in all), registered in Switzerland. Services from FSIT are reached through these addresses.
What it means to see AS59891 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS59891. That means the other end sits on the FSIT network (Switzerland). 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 AS59891?
AS59891 is assigned to FSIT, registered in Switzerland.
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 AS59891 control?
AS59891 currently announces about 2 thousand routed IPv4 addresses.