Community · Official remote MCP server

The Subdomain API MCP server,
connected in one click.

Find known subdomains of a domain. Passive data; may include historic entries. List or count. Connect the official Subdomain API MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.

Connect Subdomain API free How it works

Free to start · No credit card · No hosting needed

Use this server

Add Subdomain API to your AI in one minute

Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.

claude mcp add --transport http subdomain-api https://api.subdomain.app/mcp

Run in your terminal, then restart Claude Code.

Subdomain API · https://api.subdomain.app/mcp

What you can do

What your AI can do with Subdomain API

Real prompts you can type the moment it's connected — no setup, no docs to read.

“Use “find_subdomains”: List known subdomains (hostnames) of a root domain. Data is passive (not active scanning): results are historic observations and may include.”

“Use “count_subdomains”: Return only the total number of distinct subdomains known for a domain — no list. Cheap and low-token. Use when the user asks "how many subd.”

Security check

How secure is the Subdomain API MCP server?

Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Subdomain API holds up.

✓ Verified directory serverSubdomain API · subdomain.app

Official endpoint

Operated by Subdomain API (subdomain.app) at its documented MCP endpoint — not a third-party mirror or community re-host.

No sign-in needed

This server only exposes public data — no account and no credentials are involved when you connect.

Scanned before it goes live

gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.

Watched for drift

If Subdomain API adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.

Run the free scanner on Subdomain API's server →

How it works

Connected in three steps

Connect your gate

Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.

Pick Subdomain API

Choose Subdomain API in the gate directory. No sign-in needed.

Use it anywhere

Subdomain API's tools are live in every AI client you've connected — with rules and logging built in.

Connect Subdomain API free

Free to start · No credit card · No hosting needed

Straight from the server

The actual tools Subdomain API exposes

Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.

find_subdomains — List known subdomains (hostnames) of a root domain. Data is passive (not active scanning): results are historic observations and may include

count_subdomains — Return only the total number of distinct subdomains known for a domain — no list. Cheap and low-token. Use when the user asks "how many subd

Author

Who runs the Subdomain API MCP server?

subdomain.app

Homepage More servers from subdomain.app →

Own this server? Claim the listing →

Server facts

The Subdomain API MCP server at a glance

Endpointhttps://api.subdomain.app/mcp

Operated bySubdomain API (subdomain.app)

CategoryCommunity

Sign-inNone — public data only

Available in gateYes — one-click connect

Works withClaude, ChatGPT, Cursor & any MCP client

FAQ

Questions, answered

Is there an official Subdomain API MCP server?

Yes — Subdomain API operates its own remote MCP server at api.subdomain.app. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.

How do I connect Subdomain API to Claude or ChatGPT?

Add gate's gateway URL to your AI client once, then pick Subdomain API in the directory. No account or sign-in is needed. From then on, Subdomain API's tools are available in every client you've connected to gate.

Do I need to host anything?

No. Subdomain API runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.

Is the Subdomain API MCP server safe to connect?

It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.