{
  "id": "siteimprove",
  "name": "Siteimprove Crawler",
  "operator": {
    "name": "Siteimprove",
    "url": "https://www.siteimprove.com"
  },
  "description": "Siteimprove's content-suite crawler, which fetches pages of sites its customers have configured in their account to run quality-assurance, accessibility, policy and SEO checks. Companion agents (LinkCheck, Image size, Probe) fetch links and resources for the same checks and crawl from the same published address list.",
  "docs": [
    "https://help.siteimprove.com/support/solutions/articles/80001162737-the-siteimprove-crawler-bot-information",
    "https://help.siteimprove.com/support/solutions/articles/80000448553-what-ip-addresses-and-user-agents-are-used-by-siteimprove-"
  ],
  "category": "seo",
  "user_agents": {
    "patterns": [
      "SiteCheck-sitecrawl by Siteimprove\\.com",
      "LinkCheck by Siteimprove\\.com",
      "Image size by Siteimprove\\.com",
      "Probe by Siteimprove\\.com"
    ],
    "instances": [
      "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) SiteCheck-sitecrawl by Siteimprove.com",
      "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) LinkCheck by Siteimprove.com",
      "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.0) LinkCheck by Siteimprove.com",
      "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) Image size by Siteimprove.com",
      "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) Probe by Siteimprove.com"
    ]
  },
  "behavior": {
    "respects_robots_txt": true,
    "robots_token": "SiteimproveBot-Crawler"
  },
  "verification": [
    {
      "type": "static_cidrs",
      "cidrs": [
        "52.55.30.145/32",
        "52.20.183.91/32",
        "13.58.165.213/32",
        "18.116.191.222/32",
        "18.116.197.208/32",
        "18.189.206.159/32",
        "18.190.68.80/32",
        "18.216.137.252/32",
        "18.223.191.8/32",
        "3.13.121.241/32",
        "3.133.38.181/32",
        "3.135.49.180/32",
        "3.136.111.218/32",
        "3.138.54.100/32",
        "18.219.35.44/32",
        "185.229.145.22/32",
        "3.129.126.175/32",
        "52.7.141.1/32",
        "52.4.143.42/32",
        "52.60.34.56/32",
        "52.57.25.76/32",
        "35.157.236.87/32",
        "35.157.42.7/32",
        "18.157.140.51/32",
        "18.159.218.224/32",
        "18.196.205.2/32",
        "18.198.120.55/32",
        "3.124.26.114/32",
        "3.125.99.135/32",
        "3.64.159.177/32",
        "3.66.247.32/32",
        "3.68.122.244/32",
        "52.57.167.198/32",
        "35.158.180.204/32",
        "18.192.147.131/32",
        "52.58.146.230/32",
        "35.156.240.123/32",
        "185.229.144.10/32",
        "52.47.166.84/32",
        "3.10.81.130/32",
        "52.48.230.149/32",
        "35.204.24.17/32",
        "52.64.209.168/32",
        "52.199.41.160/32"
      ]
    }
  ],
  "tier": 2,
  "tier_label": "Verifiable",
  "first_seen": "2026-07-24T13:19:52.933Z",
  "resolved_cidrs": [
    "13.58.165.213/32",
    "18.116.191.222/32",
    "18.116.197.208/32",
    "18.157.140.51/32",
    "18.159.218.224/32",
    "18.189.206.159/32",
    "18.190.68.80/32",
    "18.192.147.131/32",
    "18.196.205.2/32",
    "18.198.120.55/32",
    "18.216.137.252/32",
    "18.219.35.44/32",
    "18.223.191.8/32",
    "185.229.144.10/32",
    "185.229.145.22/32",
    "3.10.81.130/32",
    "3.124.26.114/32",
    "3.125.99.135/32",
    "3.129.126.175/32",
    "3.13.121.241/32",
    "3.133.38.181/32",
    "3.135.49.180/32",
    "3.136.111.218/32",
    "3.138.54.100/32",
    "3.64.159.177/32",
    "3.66.247.32/32",
    "3.68.122.244/32",
    "35.156.240.123/32",
    "35.157.236.87/32",
    "35.157.42.7/32",
    "35.158.180.204/32",
    "35.204.24.17/32",
    "52.199.41.160/32",
    "52.20.183.91/32",
    "52.4.143.42/32",
    "52.47.166.84/32",
    "52.48.230.149/32",
    "52.55.30.145/32",
    "52.57.167.198/32",
    "52.57.25.76/32",
    "52.58.146.230/32",
    "52.60.34.56/32",
    "52.64.209.168/32",
    "52.7.141.1/32"
  ]
}