# SpanId

`import { SpanId } from "destack:telemetry";`

Span identifier inside one trace.

```ds title="SpanId"
export newtype SpanId = uint64
```

[language/library/src/telemetry/record.ds:37](https://github.com/destack-sh/destack/blob/main/language/library/src/telemetry/record.ds#L37)