reverse_dns_bulk

Reverse DNS lookup for multiple IP addresses at once. ips: comma-separated IPv4 or IPv6 addresses (max 50). Returns PTR hostname for each IP, or an error if lookup fails.

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/reverse-dns-bulk.md

WHAT IT DOES

What reverse_dns_bulk does on Mcp Nettools

AI agents call reverse_dns_bulk 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 reverse_dns_bulk is rated Low

This tool retrieves network information (DNS PTR records) without creating, modifying, deleting, or executing anything. It is a passive diagnostic query that poses minimal risk; the blast radius of misuse is limited to information disclosure about IP-to-hostname mappings, which are typically non-sensitive or already public DNS data.

From the tool's definition Tool performs 'Reverse DNS lookup' which 'Returns PTR hostname for each IP' — a pure query operation retrieving DNS records with no modifications, side effects, or external state changes.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs reverse_dns_bulk 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 reverse_dns_bulk, this is the rule to start with:

reverse_dns_bulk Allowed

reverse_dns_bulk 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": {
    "reverse_dns_bulk": {}
  }
}

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 reverse_dns_bulk call is checked against it from then on.

FAQ

Questions about reverse_dns_bulk

What does the reverse_dns_bulk tool do? +

Reverse DNS lookup for multiple IP addresses at once. ips: comma-separated IPv4 or IPv6 addresses (max 50). Returns PTR hostname for each IP, or an error if lookup fails. 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 reverse_dns_bulk? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for reverse_dns_bulk: 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 reverse_dns_bulk? +

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

Can I rate-limit reverse_dns_bulk? +

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

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

reverse_dns_bulk 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.

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