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Published At: June 6, 2024

An autonomous system number (ASN) is a number assigned to a local network, registered into the carrier’s routing community and placed under the umbrella of an administrative domain called an autonomous system.

In practical terms, an ASN is often correlated with an ISP (Internet Service Provider), though a single ISP may operate over multiple ASNs. For example, Comcast (a common ISP in the United States) and Verizon operate multiple on ASNs, depending on the region they are servicing.

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