OpenRTB
Real-Time Bidding protocol: the standard JSON format for bid requests/responses between SSP/ADX and DSP — the lingua franca of programmatic advertising. This Explorer covers object- and field-level data, with enumerations, examples, version Diff and Validator on the way.
OpenRTB 2.6 (benchmark version)
Since 2.6 all enumerations reference AdCOM 1.0; the spec is revised on a rolling basis (202202 → 202211 → 202303…), with revision numbers embedded in field deprecation notes. Current data: 38 objects / 417 fields。
Data baseline: OpenRTB 2.6-202606 · openrtb2.x/2.6.md · commit 1debba8 · fetched 2026-08-12 · CC-BY 3.0 (IAB Tech Lab) · first-draft proofreading
OpenRTB 2.5 (largest legacy footprint)
Official 2.5 has no machine-readable source (PDF on the IAB site only); field-level data comes from a third-party Go implementation, and the field descriptions shared by both versions have been reconciled against the official 2.6 draft. Current data: 25 objects / 298 fields。
Data baseline: mxmCherry/openrtb · commit 1772492 · fetched 2026-08-12 · Apache 2.0 · proofreading against the official PDF
Other versions
2.3 / 2.4 carry version metadata only (no official machine-readable source); 3.0 is built on the AdCOM Object Model and isolated from the 2.x ecosystem. Version Diff and metadata work is planned for P0c / P1.
Spec sources
IAB Tech Lab · official OpenRTB 2.x repository openrtb2.x (CC-BY 3.0). The official spec text and revisions are authoritative; field descriptions on this site are the spec as published, with attribution.