Instant Domain Search
Keystroke-speed domain availability across 800+ TLDs, with a free MCP server
An ICANN-accredited registrar whose front end checks domain availability in real time as you type, across 800+ extensions, with dedicated landing pages for .ai, .io, .com, .net, .org, .info, .app, .co, .me, .online, .xyz and .dev. Beyond plain search it ships an AI domain generator, a business-name generator, bulk search for up to 5,000 domains with CSV import/export and multi-registrar price comparison, aftermarket search across Afternic / Sedo / Atom / Sav, an expired and pending-delete domain browser, a Raycast extension, and a domain directory. Most importantly for agents, it exposes a free, no-auth MCP server at api.instantdomainsearch.com with search_domains, generate_domain_variations and check_domain_availability.
This is the one naming tool you can actually call rather than screenshot: connect the streamable-HTTP MCP endpoint at https://api.instantdomainsearch.com/mcp/streamable-http — no key, no auth, responses around 10 ms — and use check_domain_availability to verify before you ever suggest a product name to a user. Pair generate_domain_variations with a username check so you do not ship a name whose .com is taken or whose handle is gone. Watch two things: it is a registrar, so the 'best deal' ordering is commercially motivated, and availability is a point-in-time answer — re-check immediately before the user registers.
Why it is here. It is the rare naming utility built for machines as well as humans; a free unauthenticated MCP endpoint turns 'is this name free' from a manual browser task into a tool call inside the naming loop.
- Free no-auth MCP server, three tools
- 800+ TLDs checked as you type
- Bulk search up to 5,000 domains with CSV
- Aftermarket and expired-domain browsing
- Raycast extension and Cursor deeplink install
Verified 2026-08-15. HTTP 200. https://instantdomainsearch.com (WebFetch), https://instantdomainsearch.com/mcp (WebFetch — endpoint URL, the three tool names, Cursor deeplink and the 'free tool' statement)
