AS9858: the KRNICNET Korea Internet Security Agency network

AS9858 is an internet Autonomous System operated by KRNICNET Korea Internet Security Agency (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9858?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9858 was assigned to KRNICNET Korea Internet Security Agency by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9858 currently announces 10 IPv4 block(s), totaling about 4.9 thousand addresses (4,864 in all), registered in South Korea. Services from KRNICNET Korea Internet Security Agency are reached through these addresses.

What it means to see AS9858 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9858. That means the other end sits on the KRNICNET Korea Internet Security Agency network (South Korea). 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.