AS27864: the Telmex Colombia S.A. network

AS27864 is an internet Autonomous System operated by Telmex Colombia S.A. (Colombia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS27864?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS27864 was assigned to Telmex Colombia S.A. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS27864 currently announces 1 IPv4 block(s), totaling 512 addresses (512 in all), registered in Colombia. Services from Telmex Colombia S.A. are reached through these addresses.

What it means to see AS27864 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS27864. That means the other end sits on the Telmex Colombia S.A. network (Colombia). 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.