AS18127: the IBARAKI Ibaraki Prefectural Government network

AS18127 is an internet Autonomous System operated by IBARAKI Ibaraki Prefectural Government (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS18127?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS18127 was assigned to IBARAKI Ibaraki Prefectural Government by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS18127 currently announces 2 IPv4 block(s), totaling about 3.6 thousand addresses (3,584 in all), registered in Japan. Services from IBARAKI Ibaraki Prefectural Government are reached through these addresses.

What it means to see AS18127 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS18127. That means the other end sits on the IBARAKI Ibaraki Prefectural Government 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.