Domain availability MCP · DNS, RDAP, WHOIS

Domain availability MCP: checked, not guessed

Language models answer "is this domain free?" from training data, which is stale the day it ships. Connect DomainRadar through the Norcube MCP server and your agent runs a live DNS, RDAP and WHOIS check instead, for one name or a long list of candidates.

Connect your agent Read the tool reference →

Live DNS · RDAP · WHOISSingle and bulk checksRegistrar and expiry datesMetered like dashboard checks

Claude · Norcube MCP

Suggest five names for a note-taking app and keep only the .com domains that are free.

domainradar_check_domains bulk job started, 5 domains

domainradar_get_bulk_check done: 2 available, 3 registered

Two are free right now: quillnestnotes.com and notefernly.com. The other three are already registered.

Example conversation. Availability was live when we checked; tool results are shortened.

Brainstorm names. Keep only the free ones

Ask your agent for name ideas and it can verify each one before showing it to you. The single check defaults to the verified mode, a real DNS lookup that falls back to RDAP, so an "available" answer is something you can act on.

"Suggest ten names for my app and only list the .com domains that are free"
Ask for the info mode and taken domains come back with the registrar and dates
Failed lookups say so instead of pretending

How check modes work

DomainRadar · Check results

Answered by 12,886 checked

startup-names.txt · Verified mode

Cache Checked recently 2,318

DNS Most domains stop here 9,536

RDAP When DNS can’t tell 902

WHOIS When RDAP is unavailable 130

Domain checker tools, live results

They all need the DomainRadar check permission on the consent screen. Only the checks are metered; reading your data is free.

Check one domain

Returns the answer right away: whether the domain is available and its status, plus the registrar and created, updated and expiry dates in the info mode when the registry publishes them. Defaults to a verified live check. Tool: domainradar_check_domain.

Check a whole list

Starts a bulk check for a list of domains and returns a job id right away. The work runs in the background on the same pipeline as bulk checks in the dashboard. Tool: domainradar_check_domains.

Page through the results

Reports a bulk job's progress and returns its results page by page, so the agent can work through large lists. Tool: domainradar_get_bulk_check; domainradar_list_bulk_checks finds earlier jobs.

Your saved domains

Your watchlist with notes and the latest stored check: availability, registrar and expiry. "Which of my saved names are still free?" Tool: domainradar_list_saved_domains.

Brand-monitor hits

Lookalike domains seen in new TLS certificates, with a risk score and the AI impersonation verdict. "Did anyone register a lookalike of my brand this week?" Tools: domainradar_list_brand_hits, domainradar_list_brand_watchers.

Generated names

Names from your AI name generations, ready to check across TLDs in one bulk check. Tools: domainradar_list_name_jobs, domainradar_get_name_job.

Real lookups, honest billing

A lookup, not a prediction

Every answer comes from a DomainRadar check against DNS, RDAP or WHOIS, the same engine behind the dashboard and API. The model only decides what to check and how to present it.

Metered exactly like dashboard checks

Agent checks are billed at the normal DomainRadar rates, including the free tier and cache reuse. There is no MCP surcharge.

Your account, your permissions

You connect with a Norcube Auth sign-in and grant DomainRadar checks explicitly. Revoke the connection in Account settings → Connected apps any time.

Common questions

Why not just ask the model if a domain is free?

A model can only repeat what it saw during training, so it can't know about a domain registered or dropped since. DomainRadar checks the live record every time (or reuses a recent cached result where allowed), so the answer reflects the registry now.

Is this a WHOIS MCP server?

It covers WHOIS and more. Availability checks start with DNS and fall back to RDAP, the structured successor to WHOIS. The info mode queries RDAP and falls back to the registry WHOIS server where a TLD has no RDAP, and returns the registrar and dates.

Can it check domain names my AI generates?

Yes, that's the main use. Ask your agent to brainstorm names and check them in the same conversation; it sends the whole list as one bulk check and shows you only the free ones.

Does it show registration prices?

No. Results include availability, status, the registrar and the created, updated and expiry dates. Prices and premium-domain flags aren't part of the result; check them with your registrar.

How much does it cost?

The same as any DomainRadar check. Usage is metered by the method that answered, with a free tier, and shows up on your normal invoice. See DomainRadar pricing.

Can my agent see my brand monitoring?

Yes. It lists your watchers and the lookalike domains DomainRadar found in new TLS certificates, with scores and AI analysis, so you can ask in plain language which hits are worth acting on. Creating watchers stays in the dashboard for now.

Which AI clients work?

Any client that supports remote MCP servers with OAuth sign-in, including Claude, Claude Code, Cursor, VS Code and ChatGPT custom connectors. Setup steps for each are on the MCP page.

Keep going

Norcube MCPConnect Claude, Cursor, VS Code or ChatGPTSetup for every client, permissions and organizations.DomainRadarDomain availability and intelligenceBulk checks, parsed WHOIS, name generation and brand monitoring.Backup + MCPBack up before you deployLet your agent take a fresh backup before a migration.

Stop trusting guessed availability

Add the Norcube MCP server to your AI client, grant DomainRadar checks, and get live answers in the chat.

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Live checks
Free tier
OAuth sign-in
Revocable