AS57154: the SWKN Stadtwerke Konstanz GmbH network

AS57154 is an internet Autonomous System operated by SWKN Stadtwerke Konstanz GmbH (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS57154?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS57154 was assigned to SWKN Stadtwerke Konstanz GmbH by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS57154 currently announces 7 IPv4 block(s), totaling about 16.6 thousand addresses (16,640 in all), registered in Germany. Services from SWKN Stadtwerke Konstanz GmbH are reached through these addresses.

What it means to see AS57154 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS57154. That means the other end sits on the SWKN Stadtwerke Konstanz GmbH 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.