AS55066: the ESTRUXTURE-BC-B network

AS55066 is an internet Autonomous System operated by ESTRUXTURE-BC-B (Canada). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS55066?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS55066 was assigned to ESTRUXTURE-BC-B by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS55066 currently announces 18 IPv4 block(s), totaling about 10.8 thousand addresses (10,752 in all), registered in Canada. Services from ESTRUXTURE-BC-B are reached through these addresses.

What it means to see AS55066 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS55066. That means the other end sits on the ESTRUXTURE-BC-B network (Canada). 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.