# WhoisJSON

> Use this tool when you need to retrieve domain registration information, DNS records, or SSL certificate details for research or verification purposes. WhoisJSON provides structured data about domain registrations, name servers, and certificate validity through a direct API integration. It is ideal for AI-assisted workflows requiring domain intelligence, such as cybersecurity research or domain availability checks.

Canonical page: https://skillsregistry.net/skills/whoisjson  
JSON: https://api.skillsregistry.net/v1/skills/whoisjson

## Description

WhoisJSON provides domain intelligence tools including WHOIS lookups, DNS record queries, SSL certificate information, and domain availability checks. It integrates directly with the WhoisJSON.com API to deliver structured data about domain registrations, name servers, and certificate validity for AI-assisted research workflows.

## Trust

- **Trust score (0–1):** 0.65
- **Verification tier:** scanned
- **Last scanned:** 2026-09-02

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** search
- **Updated:** 2026-09-02

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/whoisjson)
- **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": "whoisjson"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/whoisjson` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/whoisjson/pull`

---
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