This page details Datadog tracing library support for trace and
A span ID is a numerical identifier generated by the tracing library for a span. Together with trace IDs, they are used to correlate traces and logs in Datadog.Glossarys.
Generated IDs: By default, all tracing libraries generate 128-bit trace IDs and 64-bit span IDs.
Accepted IDs: Datadog accepts 128-bit or 64-bit trace IDs, and 64-bit span IDs.
128-bit trace IDs
128-bit trace IDs are generated and accepted by default in the latest versions of Datadog tracing libraries:
Trace IDs are generated as 128-bit by default, and they are accepted as either 128-bit or 64-bit integers. To generate 64-bit trace IDs, set the environment variable DD_TRACE_128_BIT_TRACEID_GENERATION_ENABLED to false.
Span IDs
Span IDs are limited to 64-bits in Datadog.
Language
Generated IDs
Valid, Accepted 64-bit int IDs
Node.js
Unsigned [0, $2^63$]
Signed or unsigned
Java
Unsigned [1, $2^63-1$]
Unsigned
Go
Unsigned [0, $2^63-1$]
Signed or unsigned
Python
Unsigned [0, $2^64-1$]
Unsigned
Ruby
Unsigned [1, $2^62-1$]
Unsigned
.NET
Unsigned [0, $2^63-1$]
Unsigned
PHP
Unsigned [1, $2^64-1$]
Unsigned
C++
Unsigned [0, $2^63-1$]
Unsigned
Further reading
Additional helpful documentation, links, and articles:
