AS13999: the Mega Cable, S.A. de C.V. network

AS13999 is an internet Autonomous System operated by Mega Cable, S.A. de C.V. (Mexico). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS13999?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS13999 was assigned to Mega Cable, S.A. de C.V. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS13999 currently announces 447 IPv4 block(s), totaling about 2 million addresses (1,952,512 in all), registered in Mexico. Services from Mega Cable, S.A. de C.V. are reached through these addresses.

What it means to see AS13999 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS13999. That means the other end sits on the Mega Cable, S.A. de C.V. 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.