AS18331: the HCC-AS-KR Daejeon Institute of Science and Technology network

AS18331 is an internet Autonomous System operated by HCC-AS-KR Daejeon Institute of Science and Technology (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS18331?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS18331 was assigned to HCC-AS-KR Daejeon Institute of Science and Technology by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS18331 currently announces 4 IPv4 block(s), totaling about 3.8 thousand addresses (3,840 in all), registered in South Korea. Services from HCC-AS-KR Daejeon Institute of Science and Technology are reached through these addresses.

What it means to see AS18331 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS18331. That means the other end sits on the HCC-AS-KR Daejeon Institute of Science and Technology 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.