AS17878: the MARK1-AS-KR DREAMMARK1 network

AS17878 is an internet Autonomous System operated by MARK1-AS-KR DREAMMARK1 (South Korea). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17878?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17878 was assigned to MARK1-AS-KR DREAMMARK1 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17878 currently announces 40 IPv4 block(s), totaling about 166.9 thousand addresses (166,912 in all), registered in South Korea. Services from MARK1-AS-KR DREAMMARK1 are reached through these addresses.

What it means to see AS17878 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17878. That means the other end sits on the MARK1-AS-KR DREAMMARK1 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.