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Home GlossaryASN (Autonomous System Number)

Networking

What is ASN (Autonomous System Number)?

Also known as: Autonomous System Number

A unique number identifying a network operator's block of IP addresses.

An Autonomous System Number (ASN) is a globally unique identifier assigned to a network operator that controls a block of IP addresses and routing policy. Anti-bot systems use ASNs to classify traffic: addresses belonging to known hosting-provider ASNs are flagged as datacenter and challenged, while residential ISP ASNs are trusted. ASN-level targeting also lets advanced users route through a specific network operator.

Related terms

Datacenter Proxy

A proxy hosted in a data center, fast and cheap but easier to detect.

ISP Proxy

A static IP hosted in a data center but registered to a residential ISP.

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