Document of Methodology (DOM) for IAB Podcast Measurement v2.2
These methods are designed to accurately report podcast download numbers in accordance with the IAB Podcast Technical Measurement Guidelines v2.2.
Measurement Window: Our system uses a static calendar day window for measuring unique downloads. By applying a fixed period for download counts, we ensure consistent, standardized data collection. Each download request within this period is tracked to capture distinct downloads and avoid duplicates across the specified time frame.
Uniques: Identification and Counting Method To accurately identify unique downloads, we apply a combination of IP Address and User Agent (UA) within a calendar day. Each unique pairing of IP Address + UA is counted as a single download, even if multiple requests come from the same source within the day. This approach helps reduce potential over-counting due to repeated requests while meeting the accuracy requirements of IAB v2.2.
Handling IPv4/IPv6: Hashing and Truncation Protocol In compliance with IAB v2.2 guidelines, our methodology accommodates both IPv4 and IPv6 addresses. For IPv6 addresses, we truncate to 64 bits to simplify address handling, which allows for a high level of accuracy without requiring the full 128-bit format. IPv4 addresses are processed in full due to their shorter format, supporting consistent reporting without modifications.
Exclusion List: Managing Cloud Service IPs To ensure accurate download counts, our system excludes IP addresses associated with cloud providers like Google Cloud, AWS, and Microsoft Azure. This exclusion prevents the counting of automated downloads, which can inflate download metrics and misrepresent actual listener engagement. Our exclusion list is reviewed and updated semi-annually to stay current with IP ranges from these services, further enhancing accuracy in our unique download reporting.