AS42755: the DATAFIBER network

AS42755 is an internet Autonomous System operated by DATAFIBER (the Netherlands). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS42755?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS42755 was assigned to DATAFIBER by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS42755 currently announces 9 IPv4 block(s), totaling about 8.2 thousand addresses (8,192 in all), registered in the Netherlands. Services from DATAFIBER are reached through these addresses.

What it means to see AS42755 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS42755. That means the other end sits on the DATAFIBER 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.