# Elastic Load Balancing and AWS X-Ray
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Elastic Load Balancing application load balancers add a trace ID to incoming HTTP requests in a header named `X-Amzn-Trace-Id`.

```
X-Amzn-Trace-Id: Root=1-5759e988-bd862e3fe1be46a994272793
```

**X-Ray trace ID format**

An X-Ray `trace_id` consists of three numbers separated by hyphens. For example, `1-58406520-a006649127e371903a2de979`. This includes:
+ The version number, which is `1`.
+ The time of the original request in Unix epoch time using **8 hexadecimal digits**.

  For example, 10:00AM December 1st, 2016 PST in epoch time is `1480615200` seconds or `58406520` in hexadecimal digits.
+ A globally unique 96-bit identifier for the trace in **24 hexadecimal digits**.

Load balancers do not send data to X-Ray, and do not appear as a node on your service map.

For more information, see [Request Tracing for Your Application Load Balancer](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-request-tracing.html) in the Elastic Load Balancing Developer Guide.