ASN Lookup
networkingLook up Autonomous System Number details for an IP or ASN.
Part of Nexabit Network Utilities — free browser tools by Nexabit IT Solutions. Developer API available for automation.
What this tool does
Look up Autonomous System Number details for an IP or ASN.
Best for
Engineers and operators working on connectivity and IP troubleshooting.
Common use cases
- Run ASN Lookup during incident response or change validation
- Export results as JSON for tickets and runbooks
- Combine with related tools on the same category page
ASN Lookup
Results
Frequently Asked Questions
ASN Lookup is a free online tool on Nexabit Network Utilities. Look up Autonomous System Number details for an IP or ASN.
Use ASN Lookup when you need to look up Autonomous System Number details for an IP or ASN. It is free in the browser on Nexabit Network Utilities with no login required.
Yes. ASN Lookup is available via the Developer API at /api/v1/network/asn-lookup. Sign in at /developers/login to create an API key. Browser use remains free.
Yes. ASN Lookup is free in your browser on Nexabit Network Utilities with no account required. The Developer API has separate free and paid plans for automation.
ASN Lookup is part of Nexabit Network Utilities, built and maintained by Nexabit IT Solutions.