Network
Free ASN Lookup From IP Address
ASN context helps you understand the network behind an IP address, such as a residential ISP, cloud provider, university, mobile carrier, or enterprise network.
Try an example
Enter an IPv4 or IPv6 address, or use your current public IP.
What this tool checks
Signals in the report
- Network owner clues for security and troubleshooting
- Country, city, ISP, and organization context
- Useful for rate limits, firewall rules, and abuse review
Best for
Practical uses
- Tell cloud traffic from residential traffic
- Review API clients by network
- Investigate suspicious login infrastructure
- Plan narrow firewall or WAF rules
How it works
Three steps
Enter the public IP address you want to identify.
Review ASN, ISP, organization, and country fields when available.
Use RDAP or WHOIS for formal ownership and abuse-contact records.
FAQ
Frequently asked questions
Related tools
Other checks worth running
Guides
Read before you decide
- ISP, ASN and network ownership7 min read
ASN Lookup Explained: How to Find the Network Behind an IP
An Autonomous System Number identifies the network that announces an IP range. What an ASN lookup tells you about ownership, and why it explains traffic quality.
Updated
- ISP, ASN and network ownership8 min read
IP WHOIS and RDAP Lookup: What They Show and When to Use Them
Geolocation estimates where an IP is used; WHOIS and RDAP record who holds it and whom to contact about abuse. When to use each during an investigation.
Updated
- ISP, ASN and network ownership2 min read
How to Find the ISP or Organization Behind an IP Address
How to find the ISP or organisation behind an IP address, where that data comes from, and why it matters when you triage traffic or a security alert.
Updated