AS5539: the SPACENET SpaceNET AG network

AS5539 is an internet Autonomous System operated by SPACENET SpaceNET AG (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS5539?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS5539 was assigned to SPACENET SpaceNET AG by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS5539 currently announces 21 IPv4 block(s), totaling about 111.9 thousand addresses (111,872 in all), registered in Germany. Services from SPACENET SpaceNET AG are reached through these addresses.

What it means to see AS5539 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS5539. That means the other end sits on the SPACENET SpaceNET AG network (Germany). 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.