{
  "id": "w3c-feed-validator",
  "name": "W3C Feed Validation Service",
  "operator": {
    "name": "World Wide Web Consortium (W3C)",
    "url": "https://www.w3.org"
  },
  "description": "W3C's feed validator, which fetches a user-submitted RSS or Atom feed to check it against the feed specifications. It is a one-off conformance check rather than a subscription fetcher, and W3C publishes its user agent and the shared validator source addresses.",
  "docs": [
    "https://validator.w3.org/services"
  ],
  "category": "feed-fetcher",
  "user_agents": {
    "patterns": [
      "FeedValidator/[\\d.]+"
    ],
    "instances": [
      "FeedValidator/1.3"
    ]
  },
  "behavior": {
    "respects_robots_txt": false
  },
  "verification": [
    {
      "type": "static_cidrs",
      "cidrs": [
        "52.22.66.203/32",
        "2600:1f18:7d7a:2700::/56"
      ]
    }
  ],
  "tier": 2,
  "tier_label": "Verifiable",
  "first_seen": "2026-09-01T13:17:25.816Z",
  "resolved_cidrs": [
    "2600:1f18:7d7a:2700::/56",
    "52.22.66.203/32"
  ]
}