ASN Lookup Tool
Find Autonomous System Numbers (ASN), network information, IP ranges, and organization details. Essential for network analysis, security research, and understanding internet infrastructure.
ASN Lookup
💡 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 10 IPs or ASNs simultaneously
• Export Data: Download results in JSON format for further analysis
• Network Types: Identify ISPs, hosting providers, CDNs, and more
What We Provide
🏢 Organization Details
Company name, country, and administrative information for the autonomous system.
🌐 Network Information
IP address ranges (CIDR blocks), network type, and routing details.
📍 Registry Data
Regional Internet Registry (RIR) information and allocation details.
🔍 Bulk Analysis
Analyze multiple IPs or ASNs simultaneously for comprehensive research.
Use Cases
🛡️ Security Research
Investigate suspicious IPs, trace attack sources, and analyze threat patterns.
🌐 Network Administration
Plan routing, configure BGP policies, and understand network topology.
📊 Traffic Analysis
Analyze visitor origins, CDN performance, and geographic distribution.
💼 Business Intelligence
Competitive analysis, market research, and infrastructure planning.
Regional Internet Registries (RIRs)
ARIN
North America
United States, Canada, parts of Caribbean
RIPE
Europe & Middle East
Europe, Russia, Middle East
APNIC
Asia-Pacific
Asia, Australia, Pacific Islands
LACNIC
Latin America
South America, Central America
AfriNIC
Africa
African continent
Common Network Types
ISP
Internet Service Providers offering connectivity to end users
Hosting/Cloud
Web hosting, cloud platforms, and server providers
Transit/Backbone
Internet backbone providers and transit networks
Content Delivery
CDN providers and content distribution networks
Telecommunications
Mobile carriers and telecom companies
Education/Research
Universities and research institutions
Government
Government agencies and military networks
Enterprise
Large corporations with their own ASN
Frequently Asked Questions
What is an ASN (Autonomous System Number)?
An ASN is a unique identifier assigned to autonomous systems on the internet. Each ASN represents a collection of IP networks under a single administrative control, like an ISP, hosting provider, or large organization.
Why look up ASN information?
ASN lookups help identify network owners, trace IP origins, analyze traffic patterns, investigate security incidents, understand network topology, and make routing decisions. Essential for network administrators and security researchers.
What information can I get from an ASN lookup?
ASN lookups provide the organization name, country, IP address ranges (CIDR blocks), registry information, network type, contact details, and sometimes abuse contacts for reporting issues.
What are the different ASN registries?
Five Regional Internet Registries (RIRs) manage ASNs: ARIN (North America), RIPE (Europe), APNIC (Asia-Pacific), LACNIC (Latin America), and AfriNIC (Africa). Each manages ASN allocation for their region.
How are ASNs used in BGP routing?
ASNs are fundamental to BGP (Border Gateway Protocol) routing. They identify autonomous systems in routing policies, path selection, and loop prevention. BGP uses ASN paths to determine the best routes between networks.
What's the difference between 16-bit and 32-bit ASNs?
Original ASNs were 16-bit (1-65535), but due to exhaustion, 32-bit ASNs were introduced (65536-4294967295). Modern systems support both formats, with 32-bit ASNs providing much larger address space.