AS21603: the Universidad La Salle, AC network

AS21603 is an internet Autonomous System operated by Universidad La Salle, AC (Mexico). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS21603?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS21603 was assigned to Universidad La Salle, AC by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS21603 currently announces 5 IPv4 block(s), totaling about 4.6 thousand addresses (4,608 in all), registered in Mexico. Services from Universidad La Salle, AC are reached through these addresses.

What it means to see AS21603 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS21603. That means the other end sits on the Universidad La Salle, AC network (Mexico). 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.