AS398981: the FSCJ network
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Testar grátis 14 dias →AS398981 is an internet Autonomous System operated by FSCJ (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 AS398981?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS398981 was assigned to FSCJ by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS398981 currently announces 1 IPv4 block(s), totaling about 1 thousand addresses (1,024 in all), registered in the United States. Services from FSCJ are reached through these addresses.
What it means to see AS398981 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS398981. That means the other end sits on the FSCJ 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 AS398981?
AS398981 is assigned to FSCJ, 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 AS398981 control?
AS398981 currently announces about 1 thousand routed IPv4 addresses.