AS81: the NCREN network
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Testar grátis 14 dias →AS81 is an internet Autonomous System operated by NCREN (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 AS81?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS81 was assigned to NCREN by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS81 currently announces 69 IPv4 block(s), totaling about 2 million addresses (1,957,376 in all), registered in the United States. Services from NCREN are reached through these addresses.
What it means to see AS81 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS81. That means the other end sits on the NCREN 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 AS81?
AS81 is assigned to NCREN, 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 AS81 control?
AS81 currently announces about 2 million routed IPv4 addresses.