AS20810: the NETCOM-KASSEL Netcom Kassel network

AS20810 is an internet Autonomous System operated by NETCOM-KASSEL Netcom Kassel (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS20810?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS20810 was assigned to NETCOM-KASSEL Netcom Kassel by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS20810 currently announces 9 IPv4 block(s), totaling about 20.2 thousand addresses (20,224 in all), registered in Germany. Services from NETCOM-KASSEL Netcom Kassel are reached through these addresses.

What it means to see AS20810 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS20810. That means the other end sits on the NETCOM-KASSEL Netcom Kassel 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.