reverse_dns

THE RISK

Low Risk

Why reverse_dns needs a policy

reverse_dns retrieves existing DNS records associated with an IP address. This is a passive query with no side effects, no code execution, no data modification, and no destructive capability. It aligns with the Read category (search, list, get, fetch).

From the tool's definition Tool description states 'Get reverse DNS records for an IP address' — a query operation that retrieves DNS information without modifying, executing, or deleting data.

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

POLICY

How to control reverse_dns

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

policy.json

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

reverse_dns 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 NetworksDB-MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More NetworksDB-MCP tools

Read asn_info Get information about an ASN. Read asn_networks Get networks belonging to an ASN. Read dns Get DNS records for a domain. Read ip_geo Get geolocation information for an IP address. Read ip_info Get information about an IP address. Read key_info Get information about your NetworksDB API key and usage statistics. Read mass_reverse_dns Get reverse DNS records for a range of IP addresses or CIDR. Read org_info Get information about an organization.

All 11 NetworksDB-MCP tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

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 reverse_dns

What does the reverse_dns tool do? +

Get reverse DNS records for an IP address. It is categorised as a Read tool in the NetworksDB-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on reverse_dns? +

Register the NetworksDB- MCP server in PolicyLayer and add a rule for reverse_dns: 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 NetworksDB-MCP. Nothing to install.

What risk level is reverse_dns? +

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

Can I rate-limit reverse_dns? +

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

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

reverse_dns is provided by the NetworksDB- MCP server (mordavid/networksdb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every NetworksDB-MCP tool call.

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

CHECK YOUR STACK →