AS139659: the LUCID-AS-AP LUCIDACLOUD LIMITED network

AS139659 is an internet Autonomous System operated by LUCID-AS-AP LUCIDACLOUD LIMITED (Hong Kong). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS139659?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS139659 was assigned to LUCID-AS-AP LUCIDACLOUD LIMITED by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS139659 currently announces 18 IPv4 block(s), totaling about 20.2 thousand addresses (20,224 in all), registered in Hong Kong. Services from LUCID-AS-AP LUCIDACLOUD LIMITED are reached through these addresses.

What it means to see AS139659 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS139659. That means the other end sits on the LUCID-AS-AP LUCIDACLOUD LIMITED network (Hong Kong). 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.