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Enter an ASN (e.g. AS13335) or IP address.
ASN Lookup - BGP Network & IP Prefix Info
Domain Input
ASN / BGP Lookup
Look up any Autonomous System Number or IP address to identify the network operator, allocated prefixes, and abuse contact. The tool classifies networks as cloud provider, CDN, ISP, hosting, or enterprise. Essential for threat intelligence, IP attribution, and understanding the network topology behind any IP address.
How It Works
The tool queries BGP routing data and RIR (Regional Internet Registry) databases to retrieve ASN ownership, announced prefixes, and abuse contacts. For IP input, the ASN is determined via BGP route lookup first. Networks are classified using known provider ASN ranges and naming patterns.
FAQ
What is an ASN?
An Autonomous System Number (ASN) identifies a network operator on the internet. Each ASN manages a set of IP prefixes and participates in BGP routing. Examples: AS13335 (Cloudflare), AS15169 (Google), AS16509 (Amazon AWS). ASNs are assigned by Regional Internet Registries (ARIN, RIPE, APNIC, etc.).
How can I find which ASN owns an IP address?
Enter the IP address in this tool — it will perform a BGP route lookup to find the announcing ASN. You can also use command-line tools like "whois -h whois.radb.net IP" or "dig TXT IP.origin.asn.cymru.com" for the same information.
What is an abuse contact and when should I use it?
The abuse contact is the email address designated for reporting malicious activity originating from that network. Use it to report spam, DDoS attacks, port scanning, or other abuse. Include timestamps, source IPs, and log evidence in your report.
Announced Prefixes
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JSON
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Tool Features
[Ad] ASN Lookup Inline
Related Guides
Coming Soon BGP route monitoring and prefix change alerts — coming soon.