AS400203: the BYF-MH-01 network
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Testar grátis 14 dias →AS400203 is an internet Autonomous System operated by BYF-MH-01 (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 AS400203?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS400203 was assigned to BYF-MH-01 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS400203 currently announces 1 IPv4 block(s), totaling 256 addresses (256 in all), registered in the United States. Services from BYF-MH-01 are reached through these addresses.
What it means to see AS400203 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS400203. That means the other end sits on the BYF-MH-01 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 AS400203?
AS400203 is assigned to BYF-MH-01, 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 AS400203 control?
AS400203 currently announces 256 routed IPv4 addresses.