# Japanese Postal Code Lookup

> Use this tool when you need to convert 7-digit Japanese postal codes into complete addresses, solving problems with address validation and auto-completion in customer forms, shipping systems, or location-based services. It takes a 7-digit postal code as input and returns a complete address, including prefecture, city, and district information. Ideal for applications requiring accurate and reliable Japanese address lookup functionality.

Canonical page: https://skillsregistry.net/skills/rooking-oss-japanese-postal-code-lookup  
JSON: https://api.skillsregistry.net/v1/skills/rooking-oss-japanese-postal-code-lookup

## Description

This MCP server provides Japanese postal code address lookup functionality by integrating with the zipcloud.ibsnet.co.jp API service. Built by RookingOSS using Python with FastMCP and httpx, it offers a single tool for converting 7-digit Japanese postal codes into complete addresses by combining the prefecture, city, and district information from the API response. The implementation includes error handling for invalid postal codes and API failures, making it useful for applications that need to validate or auto-complete Japanese addresses from postal codes in customer forms, shipping systems, or location-based services.

## Trust

- **Trust score (0–1):** 0.99
- **Verification tier:** verified
- **Last scanned:** 2026-09-28

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** maps-location
- **Updated:** 2026-09-28

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/rooking-oss-japanese-postal-code-lookup)
- **Repository:** <https://github.com/rooking-oss/zipcode-search-mcp>

## 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": "rooking-oss-japanese-postal-code-lookup"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/rooking-oss-japanese-postal-code-lookup` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/rooking-oss-japanese-postal-code-lookup/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