AS2527: the SO-NET Sony Network Communications Inc. network

AS2527 is an internet Autonomous System operated by SO-NET Sony Network Communications Inc. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS2527?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS2527 was assigned to SO-NET Sony Network Communications Inc. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS2527 currently announces 71 IPv4 block(s), totaling about 3.9 million addresses (3,867,648 in all), registered in Japan. Services from SO-NET Sony Network Communications Inc. are reached through these addresses.

What it means to see AS2527 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS2527. That means the other end sits on the SO-NET Sony Network Communications 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.