ASN Lookup
Look up the autonomous system number (ASN), network operator and IP prefix of an IP address.
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Network Information
IP Address:
IP Prefix:
Network Operator:
ASN:
Country:
Registry:
About ASN Lookup Tool
ASN Lookup is a powerful tool that helps you identify the Autonomous System Number (ASN) associated with IP addresses and networks. With this tool, you can quickly discover the organization that owns or operates a specific network, track network routes, and gather critical information for infrastructure and network security analysis.
ASN Lookup is a free search tool that helps you quickly determine information about the Autonomous System Number (ASN) linked to a specific IP address.
Key features
- Security Analysis Determine the origin of cyberattacks or unusual traffic from an IP address.
- Network Management Check and verify information about organizations managing IP address ranges within your network infrastructure.
- IP Address Research Find out detailed information about the owner of an IP address, including geographical location and contact information.
- Spam and Abuse Prevention Identify and block IP addresses from organizations that send spam or engage in abusive activities.
- Server Verification Verify the ASN information of web, email, or other service servers before establishing a connection.
- Regulatory Compliance Gather ASN information to meet compliance and auditing requirements within your company.
How to use ASN Lookup
- Enter search info Enter an IP address or ASN into the search box on the tool page.
- Perform search Click the "Lookup" button to start the search.
- View result overview The tool will display results including the organization name, country, IP range, and related information.
- View technical details View detailed ASN information, IP scope, and WHOIS data of the managing organization.
- Use the data Copy or export the results if necessary for your work.
Usage tips
- ASN Definition: An ASN is a unique identifier assigned to each autonomous system on the Internet, which helps route data traffic between different networks.
- ASN Structure: An ASN is represented as an integer from 0 to 4,294,967,295, often written as AS65001 or 65001.
- ASN Allocation: ASNs are allocated by Regional Internet Registries (RIRs) such as APNIC, RIPE, ARIN, and others.
- Data Source: ASN Lookup uses public WHOIS databases to retrieve detailed information about ASNs, IP addresses, and managing organizations.
- Returned Information: This includes the organization name, country, managed IP range, contact phone number, and email.
- Updates: Data is periodically updated from official WHOIS databases worldwide.
Frequently asked questions
An ASN (Autonomous System Number) is a unique identifier for an Autonomous System on the Internet. It is crucial because it routes traffic between Internet Service Providers (ISPs) and large networks, ensuring data reaches its intended destination.
You simply enter the IP address into our lookup tool. The system will automatically query the database to find the ASN and ownership information associated with that IP address.
Yes. The tool uses WHOIS databases and official routing data sources from Regional Internet Registries (RIRs) to provide the most accurate results possible.
Currently, this tool is primarily designed for lookups via an ASN number or IP address. Looking up by organization name might require a different, specialized WHOIS search tool.
Yes. Identifying the source network (via ASN) of IP addresses conducting attacks or sending spam allows network administrators to block the entire IP range from that abusive organization instead of blocking individual IPs one by one.