AS1273: the CW Vodafone Group PLC network

AS1273 is an internet Autonomous System operated by CW Vodafone Group PLC (EU). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS1273?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS1273 was assigned to CW Vodafone Group PLC by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS1273 currently announces 174 IPv4 block(s), totaling about 1.8 million addresses (1,841,408 in all), registered in EU. Services from CW Vodafone Group PLC are reached through these addresses.

What it means to see AS1273 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS1273. That means the other end sits on the CW Vodafone Group PLC network (EU). 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.