AS265721: the Cable Atlantico SRL network

AS265721 is an internet Autonomous System operated by Cable Atlantico SRL (the Dominican Republic). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS265721?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS265721 was assigned to Cable Atlantico SRL by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS265721 currently announces 12 IPv4 block(s), totaling about 49.7 thousand addresses (49,664 in all), registered in the Dominican Republic. Services from Cable Atlantico SRL are reached through these addresses.

What it means to see AS265721 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS265721. That means the other end sits on the Cable Atlantico SRL network (the Dominican Republic). 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.