AS9593: the NIKKEI Nikkei Inc. network

AS9593 is an internet Autonomous System operated by NIKKEI Nikkei Inc. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9593?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9593 was assigned to NIKKEI Nikkei Inc. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9593 currently announces 3 IPv4 block(s), totaling about 64.5 thousand addresses (64,512 in all), registered in Japan. Services from NIKKEI Nikkei Inc. are reached through these addresses.

What it means to see AS9593 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9593. That means the other end sits on the NIKKEI Nikkei Inc. 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.