ASN Lookup
Enter an Autonomous System Number (ASN) to get detailed information about it.
About ASN Lookup
An Autonomous System Number (ASN) is a unique identifier assigned to an autonomous system (AS) by the Internet Assigned Numbers Authority (IANA). An autonomous system is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators that presents a common, clearly defined routing policy to the Internet.
What Information Can You Get from an ASN Lookup?
- ASN Details: The unique number assigned to the autonomous system.
- Organization Name: The name of the organization that owns the ASN.
- Announced Status: Whether the ASN is currently announced in the global routing table.
- IP Prefixes: The range of IP addresses associated with the ASN.
- ASN Neighbors: Other ASNs that are directly connected to this ASN in the global routing table.
Understanding IP Prefixes
An IP prefix is a range of IP addresses that are grouped together for routing purposes. In the context of ASNs, these prefixes represent the blocks of IP addresses that an autonomous system announces to the global internet. The prefix is typically written in CIDR (Classless Inter-Domain Routing) notation, such as 192.168.0.0/24, where the number after the slash indicates how many bits of the IP address are fixed for that prefix.
Uses of ASN Lookup
- Network Troubleshooting: Identify the source of routing issues or network problems.
- Security Analysis: Investigate the origin of suspicious network activity.
- Market Research: Understand the size and scope of various internet service providers.
- Network Planning: Assist in planning network expansions or interconnections.