AS197540: the NETCUP-AS netcup GmbH network

AS197540 is an internet Autonomous System operated by NETCUP-AS netcup GmbH (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS197540?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS197540 was assigned to NETCUP-AS netcup GmbH by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS197540 currently announces 95 IPv4 block(s), totaling about 207.6 thousand addresses (207,616 in all), registered in Germany. Services from NETCUP-AS netcup GmbH are reached through these addresses.

What it means to see AS197540 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS197540. That means the other end sits on the NETCUP-AS netcup 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.