AS137008: the OPENTEXT-AS-AP-JP-TOK 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken network

AS137008 is an internet Autonomous System operated by OPENTEXT-AS-AP-JP-TOK 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS137008?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS137008 was assigned to OPENTEXT-AS-AP-JP-TOK 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS137008 currently announces 1 IPv4 block(s), totaling 256 addresses (256 in all), registered in Japan. Services from OPENTEXT-AS-AP-JP-TOK 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken are reached through these addresses.

What it means to see AS137008 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS137008. That means the other end sits on the OPENTEXT-AS-AP-JP-TOK 1120 Shimokuzawa Chuo-ku Sagamihara-shi Kanagawa-ken 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.