{
  "kind": "fact",
  "studySlug": "citation-sources",
  "slug": "the-citation-graph-spans-hundreds-of-thousands-of-domains",
  "title": "The citation graph spans more than 700,000 domains",
  "description": "The long tail is enormous even when the head is concentrated.",
  "lastUpdated": "2026-10-14",
  "lastTested": "2026-10-14",
  "sourceStudyUrl": "/trakkr-research/citation-sources",
  "sourceStudyTitle": "AI Citation Index",
  "claimIds": [
    "citation-sources:unique-domains",
    "citation-sources:brands-analyzed"
  ],
  "relatedSlugs": [
    "answer:how-concentrated-is-the-ai-citation-landscape",
    "answer:does-ai-rely-more-on-reference-sites-than-the-open-web",
    "tracker:top-cited-domain-tracker"
  ],
  "methodologySummary": "Built from 80,769,585 citation appearances across 725,777 unique domains in the latest valid snapshot for 1,928 tracked brands, observed from October 3, 2025 to October 14, 2026.",
  "limitations": [
    "The index is a changing panel of tracked brands and prompts, not a random sample of all AI responses.",
    "Domain share is observational. It does not establish causal influence or reveal the full retrieval set.",
    "The hand-maintained source taxonomy is partial: 88.40% of citation appearances remain in “other”.",
    "Model attribution, response-level citation denominators, geography, raw prompts, and raw responses are not retained in the public aggregate."
  ],
  "keywords": [
    "AI citations",
    "citation sources",
    "AI source preferences",
    "domain authority in AI"
  ],
  "schemaHints": {
    "pageType": "Article",
    "includeDataset": true
  },
  "claim": "The current Trakkr citation index spans 725,777 unique domains.",
  "supportingMetrics": [
    {
      "label": "Unique domains",
      "value": "725,777",
      "detail": "Distinct normalized domains in the current brand snapshots."
    },
    {
      "label": "Tracked brands",
      "value": "1,928",
      "detail": "Current brand-snapshot coverage."
    }
  ],
  "whyItMatters": "Brands do not only compete with category leaders. They compete with an extremely fragmented evidence layer.",
  "citationBlock": {
    "quote": "The current Trakkr citation index spans 725,777 unique domains.",
    "attribution": "AI Citation Index - Trakkr Research",
    "url": "https://trakkr.ai/trakkr-research/citation-sources/facts/the-citation-graph-spans-hundreds-of-thousands-of-domains"
  }
}