AS4058: the CITICTEL-CPC-AS4058 CITIC Telecom International CPC Limited network

AS4058 is an internet Autonomous System operated by CITICTEL-CPC-AS4058 CITIC Telecom International CPC 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 AS4058?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS4058 was assigned to CITICTEL-CPC-AS4058 CITIC Telecom International CPC Limited by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS4058 currently announces 104 IPv4 block(s), totaling about 266.2 thousand addresses (266,240 in all), registered in Hong Kong. Services from CITICTEL-CPC-AS4058 CITIC Telecom International CPC Limited are reached through these addresses.

What it means to see AS4058 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS4058. That means the other end sits on the CITICTEL-CPC-AS4058 CITIC Telecom International CPC 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.