AS203101: the NAVARINO-POP AS3356 LEVEL3 network

AS203101 is an internet Autonomous System operated by NAVARINO-POP AS3356 LEVEL3 (Greece). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS203101?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS203101 was assigned to NAVARINO-POP AS3356 LEVEL3 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS203101 currently announces 7 IPv4 block(s), totaling about 10.2 thousand addresses (10,240 in all), registered in Greece. Services from NAVARINO-POP AS3356 LEVEL3 are reached through these addresses.

What it means to see AS203101 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS203101. That means the other end sits on the NAVARINO-POP AS3356 LEVEL3 network (Greece). 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.