AS18183: the NCREE National Center for Research on Earthquake Engineering network

AS18183 is an internet Autonomous System operated by NCREE National Center for Research on Earthquake Engineering (Taiwan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS18183?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS18183 was assigned to NCREE National Center for Research on Earthquake Engineering by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS18183 currently announces 4 IPv4 block(s), totaling about 5.6 thousand addresses (5,632 in all), registered in Taiwan. Services from NCREE National Center for Research on Earthquake Engineering are reached through these addresses.

What it means to see AS18183 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS18183. That means the other end sits on the NCREE National Center for Research on Earthquake Engineering network (Taiwan). 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.