ASN Lookup Tool
Find Autonomous System Numbers (ASN) instantly from any IP address. Get network owner details, IP ranges, BGP routing information, and comprehensive network analysis for cybersecurity research and network administration.
ASN Lookup
🔗 API Integration
💡 ASN Lookup Guide
• IP to ASN: Enter any IP address to find its autonomous system
• ASN Details: Enter ASN number (like 15169) to get organization info
• Bulk Lookup: Process up to 50 IPs or ASNs with API key
• Export Data: Download results in JSON format for further analysis
• Network Types: Identify ISPs, hosting providers, CDNs, and more
• API Integration: Use our REST API for automated lookups
What is ASN Lookup?
ASN (Autonomous System Number) lookup is a network analysis technique that identifies the organization responsible for routing a specific IP address. Every IP address belongs to an autonomous system, which is a network managed by a single entity.
Network administrators, security researchers, and developers use ASN lookup to understand network ownership, investigate security incidents, and analyze internet infrastructure. The information helps withnetwork planningand routing decisions.
ASN Information Includes:
- • Organization name and details
- • Country and registry information
- • IP address ranges (CIDR blocks)
- • Contact and abuse information
- • BGP routing data
ASN Use Cases
Security Analysis
Identify suspicious IP addresses, trace attack sources, and investigate malicious network activity by understanding network ownership.
Network Administration
Plan peering relationships, understand traffic routing, and optimize network performance by analyzing autonomous system paths.
Research & Compliance
Conduct internet infrastructure research, ensure regulatory compliance, and perform due diligence on network partners and providers.
Frequently Asked Questions
What is an ASN (Autonomous System Number)?
An ASN is a unique identifier assigned to networks on the internet. It helps route traffic between different networks and identifies who owns or operates a particular network segment.
How do I find the ASN for an IP address?
Enter any IP address in our ASN lookup tool. It will instantly show you the ASN, network owner, country, and IP range information for that address.
What information can I get from ASN lookup?
ASN lookup provides network owner details, organization name, country, IP address ranges, contact information, and routing registry data.
Are ASN lookups free?
Yes, our ASN lookup tool is completely free to use. You can perform unlimited lookups without registration or API limits for basic usage.
Can I look up IPv6 addresses?
Yes, our ASN lookup tool supports both IPv4 and IPv6 addresses. Simply enter either format and get complete network information.