AS29550: the SIMPLYTRANSIT network

AS29550 is an internet Autonomous System operated by SIMPLYTRANSIT (the United Kingdom). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS29550?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS29550 was assigned to SIMPLYTRANSIT by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS29550 currently announces 12 IPv4 block(s), totaling about 85.8 thousand addresses (85,760 in all), registered in the United Kingdom. Services from SIMPLYTRANSIT are reached through these addresses.

What it means to see AS29550 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS29550. That means the other end sits on the SIMPLYTRANSIT network (the United Kingdom). 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.