AS278: the Universidad Nacional Autonoma de Mexico network

AS278 is an internet Autonomous System operated by Universidad Nacional Autonoma de Mexico (Mexico). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS278?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS278 was assigned to Universidad Nacional Autonoma de Mexico by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS278 currently announces 159 IPv4 block(s), totaling about 132.2 thousand addresses (132,190 in all), registered in Mexico. Services from Universidad Nacional Autonoma de Mexico are reached through these addresses.

What it means to see AS278 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS278. That means the other end sits on the Universidad Nacional Autonoma de Mexico 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.