An ASN lookup, otherwise known as Autonomous System Number lookups, are used to obtain information about a particular network provider and its resources. The autonomous system (AS) is a unit of organized IP networks, which falls under the authority of a single entity in the Internet. This entity may be an organization such as an ISP or large enterprise. An ASN helps uniquely identify a particular network on the Internet and is administered by either a private individual or organization on behalf of their customers.
An ASN lookup is a process that allows you to request information about the AS associated with an IP address. In this way, you can identify the organization behind the IP address and even contact them for further details about their services. By doing an ASN lookup, you can also find out whether or not specific domains are hosted by them and what kind of services they provide.
The results from an ASN lookup provide details regarding who owns the specific network number and its associated resources. Apart from contacting them to learn more about their services, it is also useful for domain dispute resolution and cyber crime investigations. With this data, security professionals can trace connections between malicious actors associated with cyber-attacks or suspicious activity back to the originating address or host.
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