AS17477: the MCT-SYDNEY Macquarie Technology Operations Pty Limited network

AS17477 is an internet Autonomous System operated by MCT-SYDNEY Macquarie Technology Operations Pty Limited (Australia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17477?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17477 was assigned to MCT-SYDNEY Macquarie Technology Operations Pty Limited by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17477 currently announces 50 IPv4 block(s), totaling about 108.8 thousand addresses (108,800 in all), registered in Australia. Services from MCT-SYDNEY Macquarie Technology Operations Pty Limited are reached through these addresses.

What it means to see AS17477 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17477. That means the other end sits on the MCT-SYDNEY Macquarie Technology Operations Pty Limited network (Australia). 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.