Reverse DNS Grounding Data

Overview

Reverse DNS Lookup works by querying the PTR record for an IP address to find its associated hostname. This is useful for identifying servers, verifying email sender authenticity, and network troubleshooting.

Live Test Reverse DNS Grounding Data Source →

The tool

Once your client is connected to the VerveContext server, this appears in its tool list as ReverseDNSGroundingData. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "ReverseDNSGroundingData",
  "arguments": {
    "ip": "8.8.8.8"
  }
}

You do not name the tool yourself; the model picks it. Asking about 8.8.8.8 in the terms this source covers is enough for it to reach for ReverseDNSGroundingData on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every source in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervecontext": {
      "url": "https://api.vervecontext.com/v1/mcp"
    }
  }
}

https://api.vervecontext.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

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{
  "status": "ok",
  "error": null,
  "data": {
    "ip": "8.8.8.8",
    "hostname": "dns.google",
    "ptr": [
      "dns.google"
    ],
    "found": true
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Why ground on it

A model can produce something that looks like this answer from its training data, and be confidently out of date or simply wrong. This source returns the current value in a shape you can check, which is the difference between an answer you can cite and one you have to hedge.

Point an evaluation at hostname: it is the field most worth pinning a claim to, and it is either present and current or absent — never plausibly invented.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 10 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Email Verification

Verify email sender authenticity by checking if the sending IP has a valid reverse DNS entry matching the sender domain

Server Identification

Identify what server or service is running on an IP address by looking up its hostname

Network Troubleshooting

Diagnose network issues by verifying that IP addresses resolve to expected hostnames

Security Analysis

Investigate suspicious IPs by discovering their associated hostnames and infrastructure

Other ways to use Reverse DNS Grounding Data

Set up Reverse DNS Grounding Data on VerveContext, or reach the same source a different way. Your VerveContext account and credits work on all of them — one key, one balance.

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