AS9354: the TDNC Community Network Center Inc. network

AS9354 is an internet Autonomous System operated by TDNC Community Network Center Inc. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9354?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9354 was assigned to TDNC Community Network Center Inc. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9354 currently announces 19 IPv4 block(s), totaling about 200.4 thousand addresses (200,448 in all), registered in Japan. Services from TDNC Community Network Center Inc. are reached through these addresses.

What it means to see AS9354 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9354. That means the other end sits on the TDNC Community Network Center 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.