AS48173: the UNBELIEVABLE-AS network

AS48173 is an internet Autonomous System operated by UNBELIEVABLE-AS (Germany). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS48173?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS48173 was assigned to UNBELIEVABLE-AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS48173 currently announces 21 IPv4 block(s), totaling about 40.4 thousand addresses (40,448 in all), registered in Germany. Services from UNBELIEVABLE-AS are reached through these addresses.

What it means to see AS48173 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS48173. That means the other end sits on the UNBELIEVABLE-AS 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.