AS3300: the BT network
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Testar grátis 14 dias →AS3300 is an internet Autonomous System operated by BT (the United Kingdom). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS3300?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS3300 was assigned to BT by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS3300 currently announces 47 IPv4 block(s), totaling about 513.3 thousand addresses (513,280 in all), registered in the United Kingdom. Services from BT are reached through these addresses.
What it means to see AS3300 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS3300. That means the other end sits on the BT network (the United Kingdom). 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 AS3300?
AS3300 is assigned to BT, registered in the United Kingdom.
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 AS3300 control?
AS3300 currently announces about 513.3 thousand routed IPv4 addresses.