AS39700: the SIGNETBREEDBAND network

AS39700 is an internet Autonomous System operated by SIGNETBREEDBAND (the Netherlands). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS39700?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS39700 was assigned to SIGNETBREEDBAND by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS39700 currently announces 17 IPv4 block(s), totaling about 11 thousand addresses (11,008 in all), registered in the Netherlands. Services from SIGNETBREEDBAND are reached through these addresses.

What it means to see AS39700 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS39700. That means the other end sits on the SIGNETBREEDBAND network (the Netherlands). 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.