AS5639: the Telecommunication Services of Trinidad and Tobago network

AS5639 is an internet Autonomous System operated by Telecommunication Services of Trinidad and Tobago (TT). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS5639?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS5639 was assigned to Telecommunication Services of Trinidad and Tobago by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS5639 currently announces 22 IPv4 block(s), totaling about 298 thousand addresses (297,984 in all), registered in TT. Services from Telecommunication Services of Trinidad and Tobago are reached through these addresses.

What it means to see AS5639 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS5639. That means the other end sits on the Telecommunication Services of Trinidad and Tobago network (TT). 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.