AS38478: the SUNNYVISION-AS-AP SunnyVision Limited network

AS38478 is an internet Autonomous System operated by SUNNYVISION-AS-AP SunnyVision Limited (Hong Kong). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS38478?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS38478 was assigned to SUNNYVISION-AS-AP SunnyVision Limited by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS38478 currently announces 39 IPv4 block(s), totaling about 24.3 thousand addresses (24,320 in all), registered in Hong Kong. Services from SUNNYVISION-AS-AP SunnyVision Limited are reached through these addresses.

What it means to see AS38478 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS38478. That means the other end sits on the SUNNYVISION-AS-AP SunnyVision Limited network (Hong Kong). 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.