AS12353: the VODAFONE-PT Vodafone Portugal network

AS12353 is an internet Autonomous System operated by VODAFONE-PT Vodafone Portugal (Portugal). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS12353?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS12353 was assigned to VODAFONE-PT Vodafone Portugal by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS12353 currently announces 26 IPv4 block(s), totaling about 1.2 million addresses (1,207,040 in all), registered in Portugal. Services from VODAFONE-PT Vodafone Portugal are reached through these addresses.

What it means to see AS12353 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS12353. That means the other end sits on the VODAFONE-PT Vodafone Portugal network (Portugal). 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.