AS17676: the GIGAINFRA SoftBank Corp. network

AS17676 is an internet Autonomous System operated by GIGAINFRA SoftBank Corp. (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS17676?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS17676 was assigned to GIGAINFRA SoftBank Corp. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS17676 currently announces 103 IPv4 block(s), totaling about 38.3 million addresses (38,313,984 in all), registered in Japan. Services from GIGAINFRA SoftBank Corp. are reached through these addresses.

What it means to see AS17676 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS17676. That means the other end sits on the GIGAINFRA SoftBank Corp. 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.