Infrastructure
What is ASN?
Autonomous System Number: the identifier for a network operator's block of IP space, such as an ISP or hosting provider.
An autonomous system number, or ASN, identifies a network that controls its own routing on the internet: an ISP, a cloud provider, a hosting company, a university or a large enterprise. Every public IP address belongs to some ASN.
Looking up an IP's ASN tells you who operates the network it sits in. That helps separate residential traffic from data centre traffic and flags providers known for hosting abuse.