AS7557: the KTNET-AS Korea Trade Network network

AS7557 is an internet Autonomous System operated by KTNET-AS Korea Trade Network (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS7557?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS7557 was assigned to KTNET-AS Korea Trade Network by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS7557 currently announces 29 IPv4 block(s), totaling about 94.2 thousand addresses (94,208 in all), registered in South Korea. Services from KTNET-AS Korea Trade Network are reached through these addresses.

What it means to see AS7557 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS7557. That means the other end sits on the KTNET-AS Korea Trade Network 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.