AS7671: the MCNET NTT SmartConnect Corporation network

AS7671 is an internet Autonomous System operated by MCNET NTT SmartConnect Corporation (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS7671?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS7671 was assigned to MCNET NTT SmartConnect Corporation by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS7671 currently announces 37 IPv4 block(s), totaling about 453.9 thousand addresses (453,888 in all), registered in Japan. Services from MCNET NTT SmartConnect Corporation are reached through these addresses.

What it means to see AS7671 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS7671. That means the other end sits on the MCNET NTT SmartConnect Corporation 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.