AS8391: the KNIPP-AS Knipp Medien und Kommunikation GmbH network

AS8391 is an internet Autonomous System operated by KNIPP-AS Knipp Medien und Kommunikation GmbH (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS8391?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS8391 was assigned to KNIPP-AS Knipp Medien und Kommunikation GmbH by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS8391 currently announces 15 IPv4 block(s), totaling about 34.6 thousand addresses (34,560 in all), registered in Germany. Services from KNIPP-AS Knipp Medien und Kommunikation GmbH are reached through these addresses.

What it means to see AS8391 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS8391. That means the other end sits on the KNIPP-AS Knipp Medien und Kommunikation 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.