AS37053: the RSAWEB-AS network

AS37053 is an internet Autonomous System operated by RSAWEB-AS (South Africa). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS37053?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS37053 was assigned to RSAWEB-AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS37053 currently announces 17 IPv4 block(s), totaling about 120.3 thousand addresses (120,320 in all), registered in South Africa. Services from RSAWEB-AS are reached through these addresses.

What it means to see AS37053 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS37053. That means the other end sits on the RSAWEB-AS network (South Africa). 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.