An Autonomous System Number (ASN) is a unique global identification number assigned to a network or group of IP addresses operated by a single entity, like an Internet Service Provider (ISP), a large corporation, or a university. Think of it as a "postal code" that identifies a specific network on the internet. ASNs enable different autonomous systems to exchange routing information and traffic with each other. From a click fraud perspective, ASNs are incredibly valuable. While individual IP addresses within a network can change frequently (especially for residential users), the ASN often remains consistent for a specific organization. By tracking ASNs, ClickSambo can detect suspicious patterns originating from entire networks known for hosting bot activity, data centers, or click farms. This allows us to identify and block fraudulent traffic more effectively, even when fraudsters attempt to evade detection by constantly shifting IP addresses within the same malicious network.