BGP and ASN: How Internet Networks Exchange Routes

Quick answer: BGP is the routing protocol used between autonomous systems, while an ASN identifies an autonomous system that participates in internet routing.

Why ASNs appear in IP results

An IP address is allocated from a network range. The ASN associated with that range can help identify the organization or network operator announcing routes for it.

Routing is not the same as geolocation

An ASN tells you about network ownership or routing relationships. It does not by itself tell you where a person or device physically is.

Use ASN Lookup to inspect an IP’s network information.