Cloudflare Ray ID

A Cloudflare Ray ID is an identifier given to every request that goes through Cloudflare.

Ray IDs are particularly useful when evaluating Security Events for patterns or false positives or more generally understanding your application traffic.

Ray IDs are added as a request header, cf-ray, to the connection from Cloudflare to the origin web server. As such the Ray IDs can be found using the Developer Tools in your browser or using curl with the -v option to show the headers.

Warning

Ray IDs are not guaranteed to be unique for every request. In some situations, different requests may have the same Ray ID.

Look up Ray IDs

Security events

All customers can view Ray IDs and associated information — IP address, user agent, ASN, etc. — by looking through sampled logs in Security Events.

Additionally, you can add filters to look for specific Ray IDs.

Please note that Security Events may use sampled data to improve performance. If sampled data is applied to your search, you might not see all events, and filters might not return the expected results. To display more events, select a smaller timeframe.

Logs

Enterprise customers can enable Ray ID as a field in their Cloudflare Logs.

Server logs

For more details about sending Ray IDs to your server logs, refer to the Cf-Ray header.