Subdomain API for Claude Code

app.subdomain/subdomains

Find known subdomains of a domain. Passive data; may include historic entries. List or count.

client:Claude Code transport:streamable-http tools:2

Install Subdomain API in Claude Code

run in your project directory

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

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs