AS53004: the Downup Telecomunicacoes e servico LTDA network

AS53004 is an internet Autonomous System operated by Downup Telecomunicacoes e servico LTDA (Brazil). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS53004?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS53004 was assigned to Downup Telecomunicacoes e servico LTDA by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS53004 currently announces 1 IPv4 block(s), totaling about 1 thousand addresses (1,024 in all), registered in Brazil. Services from Downup Telecomunicacoes e servico LTDA are reached through these addresses.

What it means to see AS53004 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS53004. That means the other end sits on the Downup Telecomunicacoes e servico LTDA network (Brazil). 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.