Instantly look up any Autonomous System Number (ASN) by ASN number, IP address, or organisation name. Get real BGP prefix data, peering information, RIR allocation details, and abuse contacts — no simulation, 100% real data.
Lookup ASN NowEnter an ASN number (e.g. 15169), IP address (e.g. 8.8.8.8), or organisation name (e.g. Google) to retrieve full ASN details.
Real data from live BGP routing databases — not simulated, not cached, not mocked.
Enter any AS number (with or without the AS prefix) to retrieve the organisation name, country, RIR allocation, and full BGP route data.
Find the ASN that owns any IPv4 or IPv6 address. Includes PTR record, prefix announcement, RIR allocation, and peering data.
Search by organisation or ISP name to discover all associated ASNs. Useful for auditing network ownership and identifying related autonomous systems.
View all IPv4 and IPv6 prefix announcements for any ASN. Understand the full IP address space controlled by an autonomous system.
See BGP peering relationships — which other autonomous systems an ASN peers with over IPv4 and IPv6. Essential for network topology analysis.
Download full ASN lookup results as JSON for developer use or TXT for documentation. Copy to clipboard for quick sharing.
Get complete Autonomous System Number information in four simple steps.
Select "ASN / IP / Name" to search by any format, or use the "IP to ASN" tab for dedicated IP address lookup.
Type an ASN number (15169 or AS15169), an IP address (8.8.8.8), or an organisation name (Google, Cloudflare, Amazon).
Instantly see organisation details, country, RIR allocation, all announced IPv4/IPv6 prefixes, and peering relationships.
Copy results to clipboard or download as JSON or TXT format for use in network documentation, security audits, or reports.
An Autonomous System Number (ASN) is a unique numeric identifier assigned by Regional Internet Registries (RIRs) to a collection of IP networks operated by a single organisation with a unified routing policy. ASNs are the backbone of Border Gateway Protocol (BGP) — the routing protocol that enables the global internet to function by exchanging routing information between different networks.
Every major internet company operates one or more ASNs. Google uses AS15169, Cloudflare operates under AS13335, and Amazon Web Services spans multiple ASNs including AS16509. When you visit a website, your internet traffic is routed across multiple autonomous systems, each identified by its unique ASN, before reaching the destination server.
Our free ASN lookup tool queries live BGP databases to provide real, up-to-date information on any ASN. Whether you need to verify IP address ownership, audit your organisation's ASN details, investigate abuse contacts for spam reports, understand BGP prefix announcements, or analyse network peering relationships — this tool delivers genuine data sourced from authoritative BGP routing databases including bgpview.io and RIPE Stat. Unlike tools that return simulated or cached data, every lookup retrieves fresh, accurate information from the source. Export results as JSON for programmatic use or TXT for compliance documentation — all completely free with no registration required.
Common questions about ASN lookup, Autonomous System Numbers, and BGP routing.
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