AS41745: the FORTIS-AS Hosting services network

AS41745 is an internet Autonomous System operated by FORTIS-AS Hosting services (Russia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS41745?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS41745 was assigned to FORTIS-AS Hosting services by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS41745 currently announces 129 IPv4 block(s), totaling about 54 thousand addresses (54,016 in all), registered in Russia. Services from FORTIS-AS Hosting services are reached through these addresses.

What it means to see AS41745 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS41745. That means the other end sits on the FORTIS-AS Hosting services network (Russia). 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.