How to Use the WhoisXML MCP in LangChain

Q: Can WhoisXML and LangChain verify user emails?

Yes. The verifyemail tool checks if an email address is valid and active. Your agent can use this as part of a larger workflow that vets domain ownership before contacting someone.

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Connect WhoisXML MCP to LangChain

Create your Vinkius account to connect WhoisXML to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup WhoisXML with LangChain

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Claude

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Chaining Domain Checks with MCP Server

The `check_domain_availability` tool immediately tells you if a domain is open for registration. You can chain this output: check availability, then pass the result to `get_whois_record` to see who previously owned it. This multi-step process lets your agent build an entire intelligence pipeline based on real data flows.

IP Location and Email Validation

You can start by getting location data for any IP address using `get_ip_geolocation`. Next, pass the associated domain name into `verify_email` to confirm if a specific contact point is active. It's perfect for agents that need to vet both network infrastructure and human contacts in sequence.

Advanced Data Retrieval Pipelines

The core of the MCP Server lets you pull deep data using `get_whois_record`. This raw WHOIS output can then feed directly into a custom prompt that summarizes ownership history. This guarantees your agent performs complex, sequential reasoning, making every tool call a measurable link in the chain.

Setup guide

Set up WhoisXML MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes WhoisXML tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "whoisxml-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent WhoisXML transactions"
    })
    print(result["messages"][-1].content)

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Common questions about WhoisXML MCP in LangChain

LangChain uses ReAct agents to decide which tools to call and in what order. If you check a domain's availability, the agent doesn't stop; it passes that result to the next tool, like checking its WHOIS record.

Yes. The `verify_email` tool checks if an email address is valid and active. Your agent can use this as part of a larger workflow that vets domain ownership before contacting someone.

Absolutely. You're not limited to single tool calls. The framework allows you to build pipelines where the output of `get_ip_geolocation` becomes the required input for another service call.

It handles domain records, IP location details, raw WHOIS information, and email validation status. It's a solid mix covering internet identity and contact points.

This MCP Server deals with publicly available network identifiers and records, specifically domain names, IP addresses, and WHOIS records. The server operates within a secure sandbox.

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