AS58791: the GMOOSK-NET GMO Internet Group, Inc. network

AS58791 is an internet Autonomous System operated by GMOOSK-NET GMO Internet Group, Inc. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS58791?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS58791 was assigned to GMOOSK-NET GMO Internet Group, Inc. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS58791 currently announces 26 IPv4 block(s), totaling about 86.8 thousand addresses (86,784 in all), registered in Japan. Services from GMOOSK-NET GMO Internet Group, Inc. are reached through these addresses.

What it means to see AS58791 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS58791. That means the other end sits on the GMOOSK-NET GMO Internet Group, Inc. network (Japan). 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.