ASN & ISP Lookup
Instantly check the Autonomous System Number (ASN), Internet Service Provider (ISP), and routing location of any IP address or domain name.
Secure Processing. No IP logs are permanently stored.
Querying Global BGP Tables...
Please wait while we resolve the IP and fetch ASN records.
Network Details
About the SERPInsight ASN & ISP Lookup
The ASN & ISP Lookup allows security researchers, network administrators, and SEO professionals to trace the origin network of any domain or IP address.
Developed by SERPInsight, this utility instantly resolves Autonomous System Numbers (ASN), organization ownership, and geographic IP location to help you audit server infrastructure and block malicious botnets.
How to use
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1
Input Target
Enter a valid IPv4/IPv6 address or a domain name (e.g., example.com) in the field above.
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2
Wait for Resolution
Our system securely contacts global registry data to match the IP block to its assigned ASN.
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3
Review & Export
Check the ISP and organization data in the table, and export it as a CSV for your records.
Understanding the Metrics
An ASN is a unique number assigned to an organization that controls a collection of IP routing prefixes. It identifies major networks like ISPs and cloud hosts on the global Internet.
The physical company or entity responsible for managing the network traffic. For websites, this is typically the hosting provider (e.g., AWS, Cloudflare, or local ISPs).
The geographic registry location of the IP block. Useful for determining if a server is physically hosted in a specific jurisdiction for compliance or SEO localization.
Optimization & Security Guide
Key Concepts & Opportunities
- Identify Bad Neighbors: If your site shares an ASN with a known spam network, your email deliverability and SEO could be impacted.
- Firewall Rule Creation: Use ASN data to block entire origin networks (like abusive datacenters) instead of playing whack-a-mole with single IPs.
- Competitor Hosting Analysis: Discover exactly which enterprise infrastructure your competitors use to host their digital assets.
Best Practices
- Cross-Reference CDNs: If an IP resolves to "Cloudflare" or "Fastly", remember you are seeing the edge node, not the origin server.
- Monitor IPv6 Configurations: Verify your IPv6 blocks belong to the same parent ASN as your legacy IPv4 ranges.
- Audit Server Migrations: After migrating hosts, use this tool to ensure DNS propagation has completely shifted to the new provider's ASN.
Frequently Asked Questions
Can I enter a domain name instead of an IP?
Why does the ISP show as a CDN instead of a web host?
Is there a limit to how many IPs I can check?
Why use SERPInsight?
Professional-grade tools for experts.
Fast Resolution
Our backend handles reverse DNS and registry queries rapidly.
Live BGP Data
We utilize live routing registries to ensure high accuracy for ASN assignments.
Total Privacy
Searches are stateless. We do not store logs of the IPs or domains you investigate.
1-Click Export
Download your lookup results directly to CSV format for rapid report generation.