AS4837: the CHINA169-BACKBONE CHINA UNICOM China169 Backbone network

AS4837 is an internet Autonomous System operated by CHINA169-BACKBONE CHINA UNICOM China169 Backbone (China). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS4837?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS4837 was assigned to CHINA169-BACKBONE CHINA UNICOM China169 Backbone by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS4837 currently announces 1,097 IPv4 block(s), totaling about 57.3 million addresses (57,267,712 in all), registered in China. Services from CHINA169-BACKBONE CHINA UNICOM China169 Backbone are reached through these addresses.

What it means to see AS4837 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS4837. That means the other end sits on the CHINA169-BACKBONE CHINA UNICOM China169 Backbone network (China). 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.