AS17529: the MEDIACAT STARCAT CABLE NETWORK Co .,LTD. network

AS17529 is an internet Autonomous System operated by MEDIACAT STARCAT CABLE NETWORK Co .,LTD. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17529?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17529 was assigned to MEDIACAT STARCAT CABLE NETWORK Co .,LTD. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17529 currently announces 11 IPv4 block(s), totaling about 135.4 thousand addresses (135,424 in all), registered in Japan. Services from MEDIACAT STARCAT CABLE NETWORK Co .,LTD. are reached through these addresses.

What it means to see AS17529 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17529. That means the other end sits on the MEDIACAT STARCAT CABLE NETWORK Co .,LTD. 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.