{
  "id": "mackerel-monitor",
  "name": "mackerel-http-checker",
  "operator": {
    "name": "Hatena Co., Ltd.",
    "url": "https://www.hatena.ne.jp/"
  },
  "description": "The prober behind Mackerel's external URL monitoring. Mackerel is Hatena's hosted server-monitoring service; when a customer configures an external URL monitor, Mackerel requests that URL from its own servers on a schedule and alerts the customer when the response fails their conditions. It checks only the URLs a customer has configured and does not crawl or follow links. Hatena publishes the address ranges Mackerel sends from as a machine-readable feed covering both webhook notifications and these monitoring requests.",
  "docs": [
    "https://mackerel.io/docs/entry/external-monitoring",
    "https://mackerel.io/ja/docs/entry/spec/metadata"
  ],
  "category": "monitoring",
  "user_agents": {
    "patterns": [
      "mackerel-http-checker/"
    ],
    "instances": [
      "mackerel-http-checker/x.y.z"
    ]
  },
  "behavior": {
    "respects_robots_txt": false
  },
  "verification": [
    {
      "type": "cidr_feed",
      "url": "https://mackerel.io/meta/ip-ranges.json",
      "format": "github_meta",
      "selector": "outgoing"
    },
    {
      "type": "cidr_feed",
      "url": "https://mackerel.io/meta/ip-ranges.json",
      "format": "github_meta",
      "selector": "outgoing_ipv6"
    }
  ],
  "tier": 1,
  "tier_label": "Fully verifiable",
  "first_seen": "2026-10-15T13:34:42.375Z",
  "resolved_cidrs": [
    "13.112.142.176/32",
    "13.113.213.40/32",
    "13.113.240.89/32",
    "13.114.12.29/32",
    "2406:da14:f83:2600::/56",
    "52.193.111.118/32",
    "52.196.125.133/32",
    "52.197.186.229/32",
    "52.198.79.40/32",
    "52.68.245.9/32"
  ]
}