AS12859: the NL-BIT BIT BV network

AS12859 is an internet Autonomous System operated by NL-BIT BIT BV (the Netherlands). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS12859?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS12859 was assigned to NL-BIT BIT BV by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS12859 currently announces 40 IPv4 block(s), totaling about 58.1 thousand addresses (58,112 in all), registered in the Netherlands. Services from NL-BIT BIT BV are reached through these addresses.

What it means to see AS12859 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS12859. That means the other end sits on the NL-BIT BIT BV 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.