AS17841: the NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICE network

AS17841 is an internet Autonomous System operated by NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICE (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17841?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17841 was assigned to NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICE by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17841 currently announces 103 IPv4 block(s), totaling about 225 thousand addresses (225,024 in all), registered in South Korea. Services from NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICE are reached through these addresses.

What it means to see AS17841 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17841. That means the other end sits on the NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICE 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.