AS15584: the SIAG SIAG Autonomous System network

AS15584 is an internet Autonomous System operated by SIAG SIAG Autonomous System (Italy). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS15584?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS15584 was assigned to SIAG SIAG Autonomous System by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS15584 currently announces 3 IPv4 block(s), totaling about 4.6 thousand addresses (4,608 in all), registered in Italy. Services from SIAG SIAG Autonomous System are reached through these addresses.

What it means to see AS15584 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS15584. That means the other end sits on the SIAG SIAG Autonomous System network (Italy). 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.