AS27298: the REACH4 network

AS27298 is an internet Autonomous System operated by REACH4 (the United States). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS27298?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS27298 was assigned to REACH4 by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS27298 currently announces 3 IPv4 block(s), totaling about 3.3 thousand addresses (3,328 in all), registered in the United States. Services from REACH4 are reached through these addresses.

What it means to see AS27298 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS27298. That means the other end sits on the REACH4 network (the United States). 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.