AS9583: the SIFY-AS-IN Sify Limited network

AS9583 is an internet Autonomous System operated by SIFY-AS-IN Sify Limited (India). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS9583?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS9583 was assigned to SIFY-AS-IN Sify Limited by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS9583 currently announces 397 IPv4 block(s), totaling about 786.7 thousand addresses (786,688 in all), registered in India. Services from SIFY-AS-IN Sify Limited are reached through these addresses.

What it means to see AS9583 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS9583. That means the other end sits on the SIFY-AS-IN Sify Limited network (India). 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.