AS9939: the DYXNET-CN DYXNET of Shenzhen Communication Co., Ltd. network

AS9939 is an internet Autonomous System operated by DYXNET-CN DYXNET of Shenzhen Communication Co., Ltd. (China). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9939?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9939 was assigned to DYXNET-CN DYXNET of Shenzhen Communication Co., Ltd. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9939 currently announces 15 IPv4 block(s), totaling about 57.3 thousand addresses (57,344 in all), registered in China. Services from DYXNET-CN DYXNET of Shenzhen Communication Co., Ltd. are reached through these addresses.

What it means to see AS9939 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9939. That means the other end sits on the DYXNET-CN DYXNET of Shenzhen Communication Co., Ltd. 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.