Tool tree

dns.ninja

Developer ToolsTools verifiedOct 1, 2026

DNS Ninja offers free DNS lookups, reverse DNS and domain intelligence for researching domains, IP addresses and DNS records.

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
  }
}

lookup_dnsAnswer

Lookup DNS records (A, AAAA, MX, NS, TXT, CNAME, SOA) for a given hostname. Also returns domain reputation info (Majestic, Tranco rankings, blocklist status).

View tool JSON

{
  "name": "lookup_dns",
  "kind": "answer",
  "impl": "imperative",
  "description": "Lookup DNS records (A, AAAA, MX, NS, TXT, CNAME, SOA) for a given hostname. Also returns domain reputation info (Majestic, Tranco rankings, blocklist status).",
  "inputSchema": {
    "type": "object",
    "properties": {
      "hostname": {
        "type": "string",
        "description": "Hostname or domain to lookup (e.g., example.com, www.example.com)"
      }
    },
    "required": [
      "hostname"
    ],
    "additionalProperties": false
  }
}

reverse_lookup_dns_recordsAnswer

Find hostnames that use a specific DNS record value. Query which hostnames point to an IP address, use a particular nameserver, or reference any DNS value. For example: 'which hostnames point to 1.2.3.4?' or 'which hostnames use chris.ns.cloudflare.com as their nameserver?'

View tool JSON

{
  "name": "reverse_lookup_dns_records",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that use a specific DNS record value. Query which hostnames point to an IP address, use a particular nameserver, or reference any DNS value. For example: 'which hostnames point to 1.2.3.4?' or 'which hostnames use chris.ns.cloudflare.com as their nameserver?'",
  "inputSchema": {
    "type": "object",
    "properties": {
      "value": {
        "type": "string",
        "description": "The DNS record value to search for (e.g., IP address, nameserver hostname, mail server, CNAME target)"
      },
      "record_type": {
        "type": "string",
        "description": "Type of DNS record to search (A, AAAA, NS, MX, CNAME, TXT)",
        "default": "A",
        "enum": [
          "A",
          "AAAA",
          "NS",
          "MX",
          "CNAME",
          "TXT"
        ]
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "value"
    ],
    "additionalProperties": false
  }
}

reverse_lookup_mxAnswer

Find hostnames that use a specific mail server. For example: which hostnames use aspmx.l.google.com as their mail server?

View tool JSON

{
  "name": "reverse_lookup_mx",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that use a specific mail server. For example: which hostnames use aspmx.l.google.com as their mail server?",
  "inputSchema": {
    "type": "object",
    "properties": {
      "mx_server": {
        "type": "string",
        "description": "The mail server hostname to search for (e.g., aspmx.l.google.com, mx1.example.com)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "mx_server"
    ],
    "additionalProperties": false
  }
}

reverse_lookup_nsAnswer

Find hostnames that use a specific nameserver. For example: which hostnames use chris.ns.cloudflare.com as their nameserver?

View tool JSON

{
  "name": "reverse_lookup_ns",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that use a specific nameserver. For example: which hostnames use chris.ns.cloudflare.com as their nameserver?",
  "inputSchema": {
    "type": "object",
    "properties": {
      "nameserver": {
        "type": "string",
        "description": "The nameserver hostname to search for (e.g., chris.ns.cloudflare.com, ns1.example.com)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "nameserver"
    ],
    "additionalProperties": false
  }
}

reverse_lookup_ipAnswer

Find hostnames that point to a specific IP address (IPv4 or IPv6). Searches both A and AAAA records. For example: which hostnames point to 1.2.3.4?

View tool JSON

{
  "name": "reverse_lookup_ip",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that point to a specific IP address (IPv4 or IPv6). Searches both A and AAAA records. For example: which hostnames point to 1.2.3.4?",
  "inputSchema": {
    "type": "object",
    "properties": {
      "ip": {
        "type": "string",
        "description": "The IP address to search for (IPv4 or IPv6)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "ip"
    ],
    "additionalProperties": false
  }
}

historic_reverse_lookup_nsAnswer

Find hostnames that *previously* used a specific nameserver but no longer do. Tracks infrastructure migrations and past delegation relationships.

View tool JSON

{
  "name": "historic_reverse_lookup_ns",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that *previously* used a specific nameserver but no longer do. Tracks infrastructure migrations and past delegation relationships.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "nameserver": {
        "type": "string",
        "description": "The nameserver hostname to search for (e.g., chris.ns.cloudflare.com, ns1.example.com)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "nameserver"
    ],
    "additionalProperties": false
  }
}

historic_reverse_lookup_mxAnswer

Find hostnames that *previously* used a specific mail server but no longer do. Tracks email provider migrations and past MX relationships.

View tool JSON

{
  "name": "historic_reverse_lookup_mx",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that *previously* used a specific mail server but no longer do. Tracks email provider migrations and past MX relationships.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "mx_server": {
        "type": "string",
        "description": "The mail server hostname to search for (e.g., aspmx.l.google.com, mx1.example.com)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "mx_server"
    ],
    "additionalProperties": false
  }
}

historic_reverse_lookup_ipAnswer

Find hostnames that *previously* pointed to a specific IP address but no longer do. Tracks hosting migrations and past IP relationships. Searches both A and AAAA records.

View tool JSON

{
  "name": "historic_reverse_lookup_ip",
  "kind": "answer",
  "impl": "imperative",
  "description": "Find hostnames that *previously* pointed to a specific IP address but no longer do. Tracks hosting migrations and past IP relationships. Searches both A and AAAA records.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "ip": {
        "type": "string",
        "description": "The IP address to search for (IPv4 or IPv6)"
      },
      "limit": {
        "type": "integer",
        "description": "Maximum number of hostnames to return",
        "default": 100,
        "minimum": 1,
        "maximum": 1000
      },
      "offset": {
        "type": "integer",
        "description": "Offset for pagination",
        "default": 0,
        "minimum": 0
      }
    },
    "required": [
      "ip"
    ],
    "additionalProperties": false
  }
}

domain_rdapAction

Queries the authoritative RDAP registry for a domain. Returns availability status (HTTP 404 = available), and for registered domains: registrar name, registration/expiration dates, nameservers, DNSSEC status, and domain status flags. Uses IANA bootstrap to find the correct RDAP server per TLD. Covers 590+ TLDs.

View tool JSON

{
  "name": "domain_rdap",
  "kind": "act",
  "impl": "imperative",
  "description": "Queries the authoritative RDAP registry for a domain. Returns availability status (HTTP 404 = available), and for registered domains: registrar name, registration/expiration dates, nameservers, DNSSEC status, and domain status flags. Uses IANA bootstrap to find the correct RDAP server per TLD. Covers 590+ TLDs.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "domain": {
        "type": "string",
        "description": "Domain name to look up (e.g., example.com)"
      }
    },
    "required": [
      "domain"
    ],
    "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
  }
}