ASN Lookup

ASN Lookup identifies the autonomous system, essentially the network block, an IP address belongs to, along with the organization that operates it. Every reachable address on the internet belongs to exactly one autonomous system, and that system's owner is usually the entity actually responsible for the traffic.

Network engineers and security teams use this to identify who really controls a block of addresses, since a hosting provider's own IP often traces back to whichever cloud platform or ISP it leases capacity from rather than the company running the site itself.

Two IP addresses under the same hosting provider can belong to different ASNs if that provider leases capacity across more than one underlying network, which is normal and not a sign of anything misconfigured.