Does everyone have their own ASN? How does it work?
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If you were to think of the internet as all of the streets in the world, then an AS number would be a city or town and all of the streets within that city.
Each ASN represents an organization and all of the Public IP addresses that are assigned to that organization.
These are typically ISPs but can also be large organizations like Microsoft, AWS, and Rackspace that are large enough to warrant having their own dedicate public IP space.
The AS is used in internet routing (BGP) to determine who has what IP blocks assigned to them, and generating paths and backup paths to get your traffic to those networks.
To use the analogy above, you use it to determine what highways to use to get to that City efficiently.
Not all organizations have AS Numbers because they aren’t large enough to warrant it. Most companies lease their public IPs from an ISP and therefore fall underneath their AS Number.
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