AS3351: the IOFFE-PHYSICAL-THECHICAL-INSTITUTE-AS network

AS3351 is an internet Autonomous System operated by IOFFE-PHYSICAL-THECHICAL-INSTITUTE-AS (Russia). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS3351?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS3351 was assigned to IOFFE-PHYSICAL-THECHICAL-INSTITUTE-AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS3351 currently announces 2 IPv4 block(s), totaling about 2.8 thousand addresses (2,816 in all), registered in Russia. Services from IOFFE-PHYSICAL-THECHICAL-INSTITUTE-AS are reached through these addresses.

What it means to see AS3351 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS3351. That means the other end sits on the IOFFE-PHYSICAL-THECHICAL-INSTITUTE-AS network (Russia). 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

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