AS50018: the FLOWMAILER network

AS50018 is an internet Autonomous System operated by FLOWMAILER (the Netherlands). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS50018?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS50018 was assigned to FLOWMAILER by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS50018 currently announces 2 IPv4 block(s), totaling about 1 thousand addresses (1,024 in all), registered in the Netherlands. Services from FLOWMAILER are reached through these addresses.

What it means to see AS50018 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS50018. That means the other end sits on the FLOWMAILER network (the Netherlands). 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.