AS21771: the NUCOR network
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Testar grátis 14 dias →AS21771 is an internet Autonomous System operated by NUCOR (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 AS21771?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS21771 was assigned to NUCOR by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS21771 currently announces 1 IPv4 block(s), totaling 256 addresses (256 in all), registered in the United States. Services from NUCOR are reached through these addresses.
What it means to see AS21771 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS21771. That means the other end sits on the NUCOR 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 AS21771?
AS21771 is assigned to NUCOR, 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 AS21771 control?
AS21771 currently announces 256 routed IPv4 addresses.