AS203273: the NETCRAFTERSOUE network

AS203273 is an internet Autonomous System operated by NETCRAFTERSOUE (Estonia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS203273?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS203273 was assigned to NETCRAFTERSOUE by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS203273 currently announces 57 IPv4 block(s), totaling about 30.2 thousand addresses (30,208 in all), registered in Estonia. Services from NETCRAFTERSOUE are reached through these addresses.

What it means to see AS203273 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS203273. That means the other end sits on the NETCRAFTERSOUE network (Estonia). 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.