AS61933: the Prefeitura Municipal de Tangara da Serra network

AS61933 is an internet Autonomous System operated by Prefeitura Municipal de Tangara da Serra (Brazil). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS61933?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS61933 was assigned to Prefeitura Municipal de Tangara da Serra by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS61933 currently announces 1 IPv4 block(s), totaling 256 addresses (256 in all), registered in Brazil. Services from Prefeitura Municipal de Tangara da Serra are reached through these addresses.

What it means to see AS61933 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS61933. That means the other end sits on the Prefeitura Municipal de Tangara da Serra 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.