AS212609: the INTERNET-6 network

AS212609 is an internet Autonomous System operated by INTERNET-6 (Lithuania). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS212609?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS212609 was assigned to INTERNET-6 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS212609 currently announces 73 IPv4 block(s), totaling about 24.1 thousand addresses (24,064 in all), registered in Lithuania. Services from INTERNET-6 are reached through these addresses.

What it means to see AS212609 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS212609. That means the other end sits on the INTERNET-6 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.