AS27725: the Empresa de Telecomunicaciones de Cuba, S.A. network

AS27725 is an internet Autonomous System operated by Empresa de Telecomunicaciones de Cuba, S.A. (CU). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS27725?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS27725 was assigned to Empresa de Telecomunicaciones de Cuba, S.A. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS27725 currently announces 29 IPv4 block(s), totaling about 190.5 thousand addresses (190,464 in all), registered in CU. Services from Empresa de Telecomunicaciones de Cuba, S.A. are reached through these addresses.

What it means to see AS27725 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS27725. That means the other end sits on the Empresa de Telecomunicaciones de Cuba, S.A. network (CU). 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.