AS23563: the SKB-VITSSEN-SUWON-AS-KR SK Broadband Co Ltd network

AS23563 is an internet Autonomous System operated by SKB-VITSSEN-SUWON-AS-KR SK Broadband Co Ltd (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS23563?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS23563 was assigned to SKB-VITSSEN-SUWON-AS-KR SK Broadband Co Ltd by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS23563 currently announces 71 IPv4 block(s), totaling about 203.8 thousand addresses (203,776 in all), registered in South Korea. Services from SKB-VITSSEN-SUWON-AS-KR SK Broadband Co Ltd are reached through these addresses.

What it means to see AS23563 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS23563. That means the other end sits on the SKB-VITSSEN-SUWON-AS-KR SK Broadband Co Ltd 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.