ASN Lookup – Find Autonomous System Numbers Instantly

What is ASN Lookup?

An ASN (Autonomous System Number) is a unique identifier assigned to networks that control blocks of IP addresses. These numbers are essential in routing internet traffic using BGP (Border Gateway Protocol).

Using our ASN Lookup Tool, you can quickly find the ASN number, network owner, IP ranges, and routing information associated with any domain or IP.

This information is crucial for network administrators, cybersecurity experts, and ISPs to ensure accurate routing, identify malicious activity, and optimize connectivity. Our tool makes ASN search fast, accurate, and accessible online—no technical expertise required.

1. Enter: Input an IP address, domain, or ASN number.
2. Click Lookup: Start the ASN search.
3. View Results: Instantly see ASN details including organization, IP ranges, country, and BGP routes.
4. Export: Download results for audits, research, or monitoring.

• Network Routing: Understand how internet traffic flows between networks.
• Cybersecurity: Detect suspicious ASNs linked to malware, spam, or botnets.
• Fraud Prevention: Verify the organization behind IP addresses.
• ISP Management: Track IP ranges owned by ISPs.
• Research: Study BGP routing and internet infrastructure.
• Compliance: Ensure communication with safe, trusted ASNs.

• ASN Number Lookup: Get details about ASN owner, country, and IP allocations.
• ASN IP Lookup: Enter an IP and find its ASN and organization.
• BGP ASN Lookup: Check advertised prefixes and peer connections.
• ASN Search by Domain: Find ASN and IP ranges linked to a domain.
• Organization & ISP Identification: Reveal the owner of any ASN.
• Country-Level Data: See where an ASN is registered.
• Prefix & IP Range Listing: List all IP blocks allocated to an ASN.
• ASN History Tracking: View past ownership and routing changes.
• Reverse ASN Lookup: Discover all IP ranges/domains tied to an ASN.
• ASN Connectivity: Analyze peering between ASNs.
• ASN Abuse Detection: Identify ASNs linked with attacks or spam.
• Export Reports: Download data for audits and monitoring.
• Free & Unlimited: Perform unlimited searches without restrictions.

• Network Administrators: Manage routing and monitor IP ranges.
• Cybersecurity Experts: Flag malicious ASNs in attack traffic.
• ISPs: Track competitor ASNs and allocations.
• Researchers: Study global internet routing.
• Compliance Teams: Ensure secure communication with trusted networks.
• Fraud Analysts: Detect ASN mismatches in transactions.

Why Choose Our ASN Lookup Tool

Unlike limited ASN search tools, ours is simple yet powerful. You don’t need technical knowledge—just enter a domain, IP, or ASN to get instant results.

Our tool offers real-time ASN data, BGP insights, exportable reports, and unlimited searches—all completely free. It’s the perfect solution for network admins, security teams, and researchers.

1. What is ASN Lookup?

It’s the process of finding the owner, IP ranges, and routing details of an Autonomous System Number.

2. How do I find an ASN for an IP?

Use our ASN IP lookup—enter the IP and get instant results.

3. Can I search ASN by domain?

Yes, just enter a domain to find its ASN and associated IP ranges.

4. What is BGP ASN Lookup?

It lets you check ASN details in Border Gateway Protocol routing tables.

5. Is your ASN Lookup tool free?

Yes, it’s 100% free and unlimited.

6. Can I check ASN history?

Yes, you can view ownership and routing changes over time.

7. What’s the difference between ASN Lookup and IP Lookup?

IP lookup shows details about one IP, while ASN lookup reveals the network owning multiple IP ranges.

8. Does ASN Lookup help in cybersecurity?

Absolutely—malicious networks can be flagged by their ASN, making them easier to block.