Official MCP RegistryHosted serverapi.subdomain.app

Subdomain.app

Passive subdomain lookup across 4.4 billion indexed subdomains — no auth or sign-up required.

Connect to Claude Code

Copy

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

Vendor-hosted remote server: nothing to install locally. If it uses OAuth, Claude opens the vendor login on first use.

Endpoints

Published in the official MCP registry as “Subdomain.app”. Verified through the vendor namespace.