Cloudflare Radar now includes a powerful BGP origin hijack detection system, available on the Radar Alerts dashboard and via API. This update helps network operators, security teams, and researchers detect and respond to malicious or accidental hijacks in real timeen.wikipedia.org+15blog.cloudflare.com+15reddit.com+15.
What Is a BGP Hijack?
BGP origin hijacking occurs when an Autonomous System (AS) announces IP prefixes it doesn’t actually own—intentionally or accidentally. This can lead to traffic interception, redirection, or even total blackholing of legitimate internet trafficblog.cloudflare.com+3en.wikipedia.org+3blog.cloudflare.com+3.
How Cloudflare’s System Works
The detection pipeline comprises three stagesarxiv.org:
- Prefix Origin Change Detection
Cloudflare watches BGP update and withdrawal messages to identify any unexpected changes in the origin AS for IP prefixescloudflare.tv+9blog.cloudflare.com+9blog.cloudflare.com+9.
- Hijack Identification
The system analyzes these origin changes against known legitimate routes. If a prefix’s origin AS is abnormal or unauthorized, it flags a potential hijackcloudflare.tv+13blog.cloudflare.com+13blog.cloudflare.com+13.
- Alerts & Reporting
Once confirmed, the hijack event is logged, alerts are generated, and users can view details via Radar’s interface or API. Operators can subscribe to notifications to stay informeddevelopers.cloudflare.com+2blog.cloudflare.com+2blog.cloudflare.com+2.
Under the hood, a Rust-based IP prefix trie efficiently records historical origin AS data from live BGP streams, enabling rapid detection without complex databasesblog.cloudflare.com.
Why It Matters
- Improved Security & Visibility: Operators gain instant awareness of routing anomalies threatening their networks.
- Proactive Risk Management: Early detection empowers teams to coordinate responses before damage occurs.
- Accessible & Scalable: Built into the free Radar dashboard and API, this tool offers enterprise-grade features to all users.
In Action 🔧
When the system detects, say, an unfamiliar AS advertising your IP range, Radar generates an alert with details like timestamp, affected prefix, suspect AS, and validation status. This lets you quickly trace the issue and take corrective action or notify your upstream provider.
Radar’s API enables automated integration:
nginxCopyEditcurl "https://api.cloudflare.com/client/v4/radar/bgp/hijacks/events?involvedAsn=YOUR_ASN&format=json"
Operators can parse these alerts to automate responses or enrich existing monitoring dashboardsarxiv.org+13radar.cloudflare.com+13blog.cloudflare.com+13blog.cloudflare.com+8developers.cloudflare.com+8blog.cloudflare.com+8.
Final Thoughts
Cloudflare Radar’s BGP origin hijack detection marks a major step forward in securing internet routing. With real-time detection, structured alerts, and easy access via API, it helps safeguard both small networks and large ISPs from accidental misconfigurations or malicious routing.
If you’re hosting mission-critical infrastructure—whether on shared, VPS, or dedicated plans—this is a tool you’ll want in your toolkit. Keeping an eye on routing anomalies ensures your users reach your site reliably and securely.
Want help integrating this with your monitoring systems—or optimizing infrastructure on Better Buy Hosting for that next level of reliability and control? We’ve got you covered!