AS17523: the AOYAMA Aoyama Gakuin University network

AS17523 is an internet Autonomous System operated by AOYAMA Aoyama Gakuin University (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17523?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17523 was assigned to AOYAMA Aoyama Gakuin University by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17523 currently announces 1 IPv4 block(s), totaling about 65.5 thousand addresses (65,536 in all), registered in Japan. Services from AOYAMA Aoyama Gakuin University are reached through these addresses.

What it means to see AS17523 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17523. That means the other end sits on the AOYAMA Aoyama Gakuin University 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.