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isitdns MCP server

Which servers in the official MCP registry are isitdns's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

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Whose server it is
  • Registry namenet.isitdns/isitdnsverified in the MCP registry

The registry name sits under isitdns.net. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools6
  • Server calls itselfisitdns
  • Server version2026-10-15
  • Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 156 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 2 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-20
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer272 ms
  • Space in an agent's context≈ 1,548 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results6 of 6 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-20
  • check_domain

    Check a domain that is not working: whether the name resolves in public DNS, then the eleven-check audit of its zone, each row ok, warn, fail or skipped with why. DNS only, not HTTP or TLS, and not for one record: dig. Measured from the…

  • dig

    Dig one name and type at one board resolver, or at Cloudflare, Google, Quad9 and AdGuard side by side (resolver all): records, flags, rcode, EDE, latency. Not for a whole domain: check_domain. Asked over DoH from the isitdns edge. from…

  • trace

    Trace a delegation from the root to the authority, like dig +trace: each referral and its glue, the one server that answered at each zone cut and any dial that failed, the final answer and its TTLs. Not for every server of a zone…

  • dnssec_chain

    Walk the DNSSEC chain from the root to one answer: DS and DNSKEY at each signed zone cut, key tags, signers, signature windows, and the first link that breaks or goes insecure. Not for one signed record: dig. Read through Cloudflare's…

  • sweep_domain

    Sweep a zone's nameservers: the same names and types asked at a sample of its authoritative addresses, reporting disagreements, lame or silent servers, serial and TTL differences, the CAA in effect, and each _acme-challenge TXT or CNAME…

  • registration

    Read a domain's registration from its registry's RDAP server: each status with what it means for resolution, the registration, expiry and change dates, the nameservers, whether the delegation is signed. Not for what DNS answers…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "isitdns": {
      "type": "http",
      "url": "https://isitdns.net/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http isitdns https://isitdns.net/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://isitdns.net/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.