O que é um ASN?
An ASN (Autonomous System Number) is a unique identifier assigned to a network or group of networks under a single administrative policy. ASNs are used by BGP (Border Gateway Protocol) to exchange routing information between networks. Major ISPs, cloud providers, and large organizations each have their own ASN.
Como Funciona
IANA assigns ASN blocks to Regional Internet Registries, which allocate them to organizations. Each ASN represents an autonomous system — a network with a consistent routing policy. BGP routers use ASNs to determine the best path for routing internet traffic between networks.
Por Que Importa
ASN lookups help identify which organization controls an IP address, diagnose routing issues, and detect suspicious network behavior. Understanding ASNs is essential for network engineers, security analysts, and anyone investigating IP reputation.
Problemas Comuns
- ASN routing leaks causing traffic misdirection
- BGP hijacking targeting specific ASNs
- IP addresses associated with low-reputation ASNs