Is the SecurityTrails API free to use?

SecurityTrails offers a Free Tier API plan which allows 50 API requests per month. This is excellent for specific, targeted OSINT investigations. For automated or large-scale recon, you would need a commercial subscription.

What is historical DNS good for?

Companies often migrate infrastructure and hide behind WAFs like Cloudflare. Historical DNS reveals the original origin IP addresses used before the WAF was implemented, which might still be active and vulnerable to direct attacks. It's a critical tool in penetration testing.

How can I find related domains for a target company?

Use the `get_associated_domains` tool. It uses proprietary correlation to find other domains owned by the same entity. You can also use `get_domains_by_ip` to find what else is hosted on their IP space.

SecurityTrails MCP Server for OpenAI Agents SDK 10 tools — connect in under 2 minutes

Name: SecurityTrails
Availability: InStock
Author: Vinkius

openai.github.io/openai-agents-python/mcp

Built by Vinkius GDPR 10 Tools SDK

The OpenAI Agents SDK enables production-grade agent workflows in Python. Connect SecurityTrails through the Vinkius and your agents gain typed, auto-discovered tools with built-in guardrails — no manual schema definitions required.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerStreamableHttp

async def main():
    # Your Vinkius token — get it at cloud.vinkius.com
    async with MCPServerStreamableHttp(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as mcp_server:

        agent = Agent(
            name="SecurityTrails Assistant",
            instructions=(
                "You help users interact with SecurityTrails. "
                "You have access to 10 tools."
            ),
            mcp_servers=[mcp_server],
        )

        result = await Runner.run(
            agent, "List all available tools from SecurityTrails"
        )
        print(result.final_output)

asyncio.run(main())

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About SecurityTrails MCP Server

Connect your SecurityTrails account to any AI agent and empower your OSINT, bug bounty, and threat intelligence workflows with the world's most comprehensive domain and IP database.

The OpenAI Agents SDK auto-discovers all 10 tools from SecurityTrails through native MCP integration. Build agents with built-in guardrails, tracing, and handoff patterns — chain multiple agents where one queries SecurityTrails, another analyzes results, and a third generates reports, all orchestrated through the Vinkius.

What you can do

Attack Surface Mapping — Instantly enumerate all subdomains for any target organization to map their external footprint
Historical DNS Analysis — Look back in time at DNS records (A, MX, NS, TXT) to find hidden infrastructure, bypassed firewalls, or legacy systems
Reverse IP Lookups — Find all domains hosted on a specific IP address to identify shared hosting or related corporate assets
Advanced Threat Hunting — Use the SecurityTrails DSL (Domain Specific Language) to query the entire internet for specific tech stacks or vulnerable infrastructure
Ownership Intelligence — Access current and historical WHOIS records to track domain ownership changes and unmask hidden threat actors
Corporate Associations — Discover domains strongly associated with your primary target to expand your investigation scope

The SecurityTrails MCP Server exposes 10 tools through the Vinkius. Connect it to OpenAI Agents SDK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect SecurityTrails to OpenAI Agents SDK via MCP

Follow these steps to integrate the SecurityTrails MCP Server with OpenAI Agents SDK.

Install the SDK

Run pip install openai-agents in your Python environment

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token from cloud.vinkius.com

Run the script

Save the code above and run it: python agent.py

Explore tools

The agent will automatically discover 10 tools from SecurityTrails

Why Use OpenAI Agents SDK with the SecurityTrails MCP Server

OpenAI Agents SDK provides unique advantages when paired with SecurityTrails through the Model Context Protocol.

Native MCP integration via `MCPServerSse` — pass the URL and the SDK auto-discovers all tools with full type safety

Built-in guardrails, tracing, and handoff patterns let you build production-grade agents without reinventing safety infrastructure

Lightweight and composable: chain multiple agents and MCP servers in a single pipeline with minimal boilerplate

First-party OpenAI support ensures optimal compatibility with GPT models for tool calling and structured output

SecurityTrails + OpenAI Agents SDK Use Cases

Practical scenarios where OpenAI Agents SDK combined with the SecurityTrails MCP Server delivers measurable value.

Automated workflows: build agents that query SecurityTrails, process the data, and trigger follow-up actions autonomously

Multi-agent orchestration: create specialist agents — one queries SecurityTrails, another analyzes results, a third generates reports

Data enrichment pipelines: stream data through SecurityTrails tools and transform it with OpenAI models in a single async loop

Customer support bots: agents query SecurityTrails to resolve tickets, look up records, and update statuses without human intervention

SecurityTrails MCP Tools for OpenAI Agents SDK (10)

These 10 tools become available when you connect SecurityTrails to OpenAI Agents SDK via MCP:

get_api_usage

Check current SecurityTrails API quota usage

get_associated_domains

Great for expanding the scope of an investigation. Find other domains associated with a target domain

get_dns_history

Useful for finding old IPs that might still be hosting vulnerable software, or tracking infrastructure migration over time. Retrieve historical DNS records for a domain

get_domain_details

Essential for mapping out a target domain's existing infrastructure. Get complete domain intelligence and current DNS records

get_domain_tags

Get classification tags for a domain

get_domains_by_ip

Essential for understanding shared hosting environments or identifying hidden vhosts. Find all domains pointed to a specific IP address

get_subdomains

Critical for attack surface mapping and asset discovery. Returns both active and inactive subdomains. Discover all subdomains for a given domain

get_whois

Get current WHOIS information for a domain

get_whois_history

Useful for OSINT investigations to uncover historical owners before privacy protection was enabled. Retrieve historical WHOIS records for a domain

search_dsl

Examples: `ipv4="1.1.1.1" AND mx="alt1.aspmx.l.google.com"` or `whois_email="admin@example.com"`. Check SecurityTrails docs for full DSL syntax. Advanced search using SecurityTrails DSL

Example Prompts for SecurityTrails in OpenAI Agents SDK

Ready-to-use prompts you can give your OpenAI Agents SDK agent to start working with SecurityTrails immediately.

"Find all subdomains for tesla.com."

"Check the historical 'A' records for example.com. Were there any changes in 2021?"

"What domains are hosted on the IP 8.8.8.8?"

Troubleshooting SecurityTrails MCP Server with OpenAI Agents SDK

Common issues when connecting SecurityTrails to OpenAI Agents SDK through the Vinkius, and how to resolve them.

MCPServerStreamableHttp not found

Ensure you have the latest version: pip install --upgrade openai-agents

Agent not calling tools

Make sure your prompt explicitly references the task the tools can help with.

SecurityTrails + OpenAI Agents SDK FAQ

Common questions about integrating SecurityTrails MCP Server with OpenAI Agents SDK.

How does the OpenAI Agents SDK connect to MCP?

Use MCPServerSse(url=...) to create a server connection. The SDK auto-discovers all tools and makes them available to your agent with full type information.