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rbls.org

Developer ToolsTools verifiedOct 1, 2026

RBLS provides real-time blacklist lookups for IP addresses and domains. Check if your mail server is blacklisted and monitor email deliverability.

ip_reputationAction

Check an IP address reputation against 100+ real-time blocklists (DNSBLs). Returns listing status, threat categories, AS info, and blocklist details.

View tool JSON

{
  "name": "ip_reputation",
  "kind": "act",
  "impl": "imperative",
  "description": "Check an IP address reputation against 100+ real-time blocklists (DNSBLs). Returns listing status, threat categories, AS info, and blocklist details.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "ip": {
        "type": "string",
        "description": "IPv4 or IPv6 address to check (e.g., 8.8.8.8, 2001:4860:4860::8888)"
      }
    },
    "required": [
      "ip"
    ],
    "additionalProperties": false
  }
}

dns_differentialAction

Resolve a domain through filtered public DNS resolvers and their unfiltered controls to detect provider threat-feed blocks.

View tool JSON

{
  "name": "dns_differential",
  "kind": "act",
  "impl": "imperative",
  "description": "Resolve a domain through filtered public DNS resolvers and their unfiltered controls to detect provider threat-feed blocks.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "domain": {
        "type": "string",
        "description": "Domain to check"
      }
    },
    "required": [
      "domain"
    ],
    "additionalProperties": false
  }
}