enumerate_dns_records

WHAT IT DOES

What enumerate_dns_records does on External Reconnaissance MCP Server

AI agents call enumerate_dns_records to retrieve information from External Reconnaissance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why enumerate_dns_records needs a policy

This tool queries and retrieves DNS records (A, MX, TXT, NS, etc.) for a domain, which is a read-only operation. However, the server context is explicitly 'external reconnaissance,' meaning this tool is designed to gather intelligence about targets that may not belong to the operator. DNS enumeration is a standard first step in offensive security/recon workflows.

From the tool's definition 'Enumerate various DNS record types for the target domain' — passive data retrieval with no side effects

Documented attack patterns abuse exactly the kind of access enumerate_dns_records gives an agent:

POLICY

How to control enumerate_dns_records

PolicyLayer is an MCP gateway — it sits between your AI agents and External Reconnaissance MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for enumerate_dns_records:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "enumerate_dns_records": {}
  }
}

enumerate_dns_records is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register External Reconnaissance MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More External Reconnaissance MCP Server tools

Execute bruteforce_subdomains Bruteforce subdomains using dnsrecon and custom wordlist. Execute enumerate_subdomains Enumerate subdomains using dnsrecon tool. Execute attempt_zone_transfer Attempt to perform a DNS zone transfer (AXFR) to enumerate all DNS records. Read run_dig_lookup perform simple lookup of any A records for the domain. Read run_whois_lookup perform query of domain ownership details. Read analyze_http_headers Analyze HTTP headers of the target domain. Read check_email_security Check email security configuration

All 8 External Reconnaissance MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about enumerate_dns_records

What does the enumerate_dns_records tool do? +

Enumerate various DNS record types for the target domain. It is categorised as a Read tool in the External Reconnaissance MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on enumerate_dns_records? +

Register the External Reconnaissance MCP Server MCP server in PolicyLayer and add a rule for enumerate_dns_records: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches External Reconnaissance MCP Server. Nothing to install.

What risk level is enumerate_dns_records? +

enumerate_dns_records is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit enumerate_dns_records? +

Yes. Add a rate_limit block to the enumerate_dns_records rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block enumerate_dns_records completely? +

Set action: deny in the PolicyLayer policy for enumerate_dns_records. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides enumerate_dns_records? +

enumerate_dns_records is provided by the External Reconnaissance MCP Server MCP server (naebo/mcp-external-recon-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every External Reconnaissance MCP Server tool call.

Start from External Reconnaissance MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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8 External Reconnaissance MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.