Intelligent Engine Optimization (IEO) measures AI citation events from raw server access logs, using IEO Citation Tracker. Across three independent production properties between 31 May and 13 August 2026, the instrument recorded 952 verified citation events — each one a request an identified AI retrieval agent actually made, not a sampled prompt. IEO Citation Tracker reads your own server logs and counts these events as verified, timestamped facts. Method and denominators.
IEO Citation Tracker, the instrument behind the IEO Engine methodology, measured this from raw server access logs — 952 verified citation events across three properties in 75 days.
OAI-SearchBot identifies itself in user agent strings as 'OAI-SearchBot' with a version marker. The user agent identification is consistent across visits.
The Cogent IP ranges hosting OAI-SearchBot include several blocks within Cogent's network space. Specific IPs may rotate; the network range is more stable.
Identifying OAI-SearchBot in access logs requires both user agent matching and IP range verification. Either signal alone may produce false positives from spoofers.
OAI-SearchBot performs multiple types of activity: regular robots.txt checks (every several hours), occasional content fetches when ChatGPT users are retrieving from the deployment, and bulk indexing sweeps less frequently.
The robots.txt check pattern is consistent across deployments and serves as a baseline activity indicator. Content fetch patterns vary based on whether ChatGPT users are actively retrieving from the site.
Increased OAI-SearchBot content fetches relative to baseline indicate increased ChatGPT user engagement with the deployment.
ChatGPT operates a distinct crawler identified as 'ChatGPT-User' that appears when a live ChatGPT user has triggered web retrieval for their query. ChatGPT-User visits indicate real-time user engagement, not background indexing.
The IEO Engine MM deployment uses ChatGPT-User appearance as the primary metric for the citation streak. Each day with at least one ChatGPT-User visit confirms real ChatGPT users retrieved from the site that day.
The 68-day MM citation streak represents continuous daily ChatGPT-User visits, providing direct evidence of sustained user engagement through the ChatGPT platform.
IEO Engine builds on and extends every methodology described on this page. Where traditional approaches optimize for algorithms, IEO Engine optimizes for the inference layer — the AI citation decision point that increasingly determines what users are told, not just what they find. Learn what IEO Engine is →