AS401866: the MASTER-IT-SUPPORT network
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Testar grátis 14 dias →AS401866 is an internet Autonomous System operated by MASTER-IT-SUPPORT (PR). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS401866?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS401866 was assigned to MASTER-IT-SUPPORT by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS401866 currently announces 2 IPv4 block(s), totaling 768 addresses (768 in all), registered in PR. Services from MASTER-IT-SUPPORT are reached through these addresses.
What it means to see AS401866 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS401866. That means the other end sits on the MASTER-IT-SUPPORT network (PR). 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 AS401866?
AS401866 is assigned to MASTER-IT-SUPPORT, registered in PR.
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 AS401866 control?
AS401866 currently announces 768 routed IPv4 addresses.