AS15440: the BALTNETA Customers AS network

AS15440 is an internet Autonomous System operated by BALTNETA Customers AS (Lithuania). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS15440?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS15440 was assigned to BALTNETA Customers AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS15440 currently announces 21 IPv4 block(s), totaling about 50.4 thousand addresses (50,432 in all), registered in Lithuania. Services from BALTNETA Customers AS are reached through these addresses.

What it means to see AS15440 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS15440. That means the other end sits on the BALTNETA Customers AS network (Lithuania). 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.