AS12389: the ROSTELECOM-AS PJSC Rostelecom. Technical Team network

AS12389 is an internet Autonomous System operated by ROSTELECOM-AS PJSC Rostelecom. Technical Team (Russia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS12389?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS12389 was assigned to ROSTELECOM-AS PJSC Rostelecom. Technical Team by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS12389 currently announces 1,068 IPv4 block(s), totaling about 9.2 million addresses (9,171,712 in all), registered in Russia. Services from ROSTELECOM-AS PJSC Rostelecom. Technical Team are reached through these addresses.

What it means to see AS12389 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS12389. That means the other end sits on the ROSTELECOM-AS PJSC Rostelecom. Technical Team 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.