AS9600: the SONYTELECOM So-net Corporation network

AS9600 is an internet Autonomous System operated by SONYTELECOM So-net Corporation (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9600?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9600 was assigned to SONYTELECOM So-net Corporation by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9600 currently announces 15 IPv4 block(s), totaling about 82.9 thousand addresses (82,944 in all), registered in Japan. Services from SONYTELECOM So-net Corporation are reached through these addresses.

What it means to see AS9600 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9600. That means the other end sits on the SONYTELECOM So-net Corporation network (Japan). 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.