dns_bulk_lookup

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aaronckj-mcp-nettools/dns-bulk-lookup.md

WHAT IT DOES

What dns_bulk_lookup does on Mcp Nettools

AI agents call dns_bulk_lookup to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why dns_bulk_lookup is rated Low

This is a read-only network diagnostic operation. DNS lookups query existing DNS records without changing, creating, or deleting any data. The operation is non-destructive and has no financial implications. The blast radius of misuse is minimal—an attacker could enumerate DNS records across multiple hosts, but this does not compromise system integrity or create irreversible damage.

From the tool's definition dns_bulk_lookup performs DNS record lookups for multiple hostnames, with parameters for record_type and optional custom nameserver. The tool retrieves DNS data with no modification, deletion, or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs dns_bulk_lookup safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For dns_bulk_lookup, this is the rule to start with:

dns_bulk_lookup Allowed

dns_bulk_lookup is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Nettools, apply this rule, and every dns_bulk_lookup call is checked against it from then on.

FAQ

Questions about dns_bulk_lookup

What does the dns_bulk_lookup tool do? +

Look up DNS records for multiple hostnames in one call. hosts: comma-separated list (e.g., 'google.com,github.com,cloudflare.com'). Max 20 hosts. record_type: A, AAAA, MX, TXT, etc. nameserver: optional custom resolver IP. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on dns_bulk_lookup? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for dns_bulk_lookup: 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 Mcp Nettools. Nothing to install.

What risk level is dns_bulk_lookup? +

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

Can I rate-limit dns_bulk_lookup? +

Yes. Add a rate_limit block to the dns_bulk_lookup 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 dns_bulk_lookup completely? +

Set action: deny in the PolicyLayer policy for dns_bulk_lookup. 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 dns_bulk_lookup? +

dns_bulk_lookup is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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