AS37988: the ALPHA-LAYER-AS-AP Alpha Layer Pty Ltd network

AS37988 is an internet Autonomous System operated by ALPHA-LAYER-AS-AP Alpha Layer Pty Ltd (Australia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS37988?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS37988 was assigned to ALPHA-LAYER-AS-AP Alpha Layer Pty Ltd by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS37988 currently announces 4 IPv4 block(s), totaling about 1.5 thousand addresses (1,536 in all), registered in Australia. Services from ALPHA-LAYER-AS-AP Alpha Layer Pty Ltd are reached through these addresses.

What it means to see AS37988 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS37988. That means the other end sits on the ALPHA-LAYER-AS-AP Alpha Layer Pty Ltd 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.