BGP: Definition, Use Cases, and Examples
BGP (Border Gateway Protocol) routes traffic between autonomous systems (ASN) on the internet. Each major ISP advertises which IP prefixes it serves. BGP hijacking is an attack where an adversary advertises someone else's prefixes. Mitigation: RPKI-signed routes. BGP governs global traffic.
What is BGP
BGP (Border Gateway Protocol) routes traffic between autonomous systems (ASN) on the internet. Each major ISP advertises which IP prefixes it serves. BGP hijacking is an attack where an adversary advertises someone else's prefixes. Mitigation: RPKI-signed routes. BGP governs global traffic.
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How it works
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What is an ASN?
ASN (Autonomous System Number) is a unique number assigned to ISP networks, CDNs, and large organizations. By ASN you can identify the IP range owner and track traffic routing.
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Enter AS number or IP — get complete information about the autonomous system.
IP Prefixes
List of all IPv4 and IPv6 subnets announced by this autonomous system.
BGP Peers
Upstream providers and peering connections for this AS.
AS Reputation
Abuse indicators: spam, DDoS sources, known malicious hosts.
Who uses this
DevOps
routing diagnostics
Security
attack source analysis
Network engineers
BGP peer analysis
Developers
CDN identification
Common Mistakes
Best Practices
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Frequently Asked Questions
Do I need BGP?
See the use-case section above. For a quick check, use our online form.