AS20712: the AS20712 Andrews & Arnold Ltd network

AS20712 is an internet Autonomous System operated by AS20712 Andrews & Arnold Ltd (the United Kingdom). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS20712?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS20712 was assigned to AS20712 Andrews & Arnold Ltd by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS20712 currently announces 85 IPv4 block(s), totaling about 148.7 thousand addresses (148,736 in all), registered in the United Kingdom. Services from AS20712 Andrews & Arnold Ltd are reached through these addresses.

What it means to see AS20712 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS20712. That means the other end sits on the AS20712 Andrews & Arnold Ltd network (the United Kingdom). 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.