AWS RTB Fabric Introduces Configurable Availability Zone Affinity for Responder Gateways

AWS RTB Fabric enhanced AdTech infrastructure efficiency by allowing configurable routing of requests to responder gateways across availability zones.

By Noah Ellis · Editorial pseudonym · 2026-09-18 · 1 min read

AI-ASSISTED REPORTING · RETROSPECTIVE ARCHIVE

Retrospective edition: 2026-09-18. Source published: 2026-09-18. Added to this archive: 2026-11-03. This briefing was prepared later from the linked announcement; it was not published on this website on the historical edition date.

Previously, requests were routed only within the requester's AZ, potentially underutilizing capacity. The new configuration lets customers specify routing preference to either prioritize the requester’s own AZ or span all AZs covered by the gateway, balancing latency and capacity usage.

This feature aims to optimize infrastructure use for demand- and supply-side platforms in digital advertising without extra RTB Fabric charges. It is available in multiple AWS regions supporting RTB Fabric, promoting lower latency and cost-effective operations.

Source & further reading

AWS RTB Fabric now supports configurable Availability Zone affinity ↗

Source published 2026-09-18. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.