AS265873: the FIBER TO THE HOME FTTH SA network

AS265873 is an internet Autonomous System operated by FIBER TO THE HOME FTTH SA (Costa Rica). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS265873?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS265873 was assigned to FIBER TO THE HOME FTTH SA by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS265873 currently announces 2 IPv4 block(s), totaling 768 addresses (768 in all), registered in Costa Rica. Services from FIBER TO THE HOME FTTH SA are reached through these addresses.

What it means to see AS265873 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS265873. That means the other end sits on the FIBER TO THE HOME FTTH SA network (Costa Rica). 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.