Subdomain API

by FastDrop

MCP MCP VERIFIED Verified 2 days ago Registry import free

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

Find known subdomains of a domain. Passive data; may include historic entries. List or count. Official MCP Registry: app.subdomain/subdomains@1.0.1. Remote endpoint: https://api.subdomain.app/mcp

Problem it solves

Discoverable MCP server listed in the official MCP Registry.

How it's different

Remote MCP endpoint ingested from the official registry and probed by FastDrop.

Ingested from the official MCP Registry

FastDrop pulled this entry from the official MCP Registry as app.subdomain/subdomains and probed the endpoint. The maker did not submit it, so the outbound link is not endorsed and the description is not theirs.

If this is your server, claim the listing to edit it and take ownership. The registry index lists everything else still awaiting a probe.

Claim this listing

Tools this endpoint exposes

Read directly from the endpoint on 26 Oct 2026. Not supplied by the maker.

find_subdomains
List known subdomains (hostnames) of a root domain. Data is passive (not active scanning): results are historic observations and may include subdomains that no longer resolve or are no longer live. Re
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 subdomains" or you only need the size of the attack surface. Cou