# WhoisJSON

> Use this tool when you need to perform domain-related lookups, such as checking domain availability, retrieving WHOIS records, or verifying SSL certificates. It solves problems related to domain research, cybersecurity, and network administration by providing detailed information about domains and their associated records. The tool accepts domain names as input and returns JSON-formatted data containing the lookup results.

Canonical page: https://skillsregistry.net/skills/io-github-whoisjson-mcp-server  
JSON: https://api.skillsregistry.net/v1/skills/io-github-whoisjson-mcp-server

## Description

WHOIS, DNS, SSL, and domain availability lookups for AI assistants

## Trust

- **Trust score (0–1):** 0.97
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.3
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-19

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.github.Whoisjson%2Fmcp-server)
- **Repository:** <https://github.com/Whoisjson/mcp-server>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "io-github-whoisjson-mcp-server"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/io-github-whoisjson-mcp-server` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/io-github-whoisjson-mcp-server/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt