AS4546: the SPGI-AS network

AS4546 is an internet Autonomous System operated by SPGI-AS (the United States). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS4546?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS4546 was assigned to SPGI-AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS4546 currently announces 19 IPv4 block(s), totaling about 14.1 thousand addresses (14,080 in all), registered in the United States. Services from SPGI-AS are reached through these addresses.

What it means to see AS4546 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS4546. That means the other end sits on the SPGI-AS network (the United States). 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.