Koskamo

Japan Postal Code Lookup MCP

A remote MCP server that resolves Japanese 〒 postcodes to prefecture, city, and town data. It supports single lookups for free and batch processing for subscribers, utilizing official Japan Post derived data via Zipcloud to enrich addresses for logistics, CRM, and AI agents.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Japan Postal Code Lookup MCP logo, by Donnie MorrisonCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-01Published by Donnie Morrison
MCP endpoint (Streamable HTTP)
https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp
Vendor documentation

What you can do with it

  • Resolve a 7-digit Japanese postcode to prefecture, city, and town
  • Batch resolve up to 50 Japanese postcodes
  • Find all address matches for a single postcode

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.donniertf-hub/jp-postal-lookup-mcp@1.0.0Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
jp-postal-lookup-mcp 1.0.0
MCP protocol
2025-06-18
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Japan Postal Code Lookup. postal_lookup is free. Subscribe (¥900/month, cancel anytime) at https://jp-postal-lookup-mcp.donniertf.workers.dev/buy for the paid tools, then pass access_token.

Tools

3 advertised

postal_lookup
Advertised by the server during the last successful anonymous check.

FREE. Resolve a 7-digit Japanese postcode to prefecture/city/town.

postal_lookup input schema
{
  "type": "object",
  "required": [
    "postcode"
  ],
  "properties": {
    "postcode": {
      "type": "string"
    }
  }
}
batch_postal
Advertised by the server during the last successful anonymous check.

PRO. Resolve up to 50 Japanese postcodes.

batch_postal input schema
{
  "type": "object",
  "required": [
    "postcodes"
  ],
  "properties": {
    "postcodes": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}
all_matches
Advertised by the server during the last successful anonymous check.

PRO. All address matches for one postcode (some codes span multiple towns).

all_matches input schema
{
  "type": "object",
  "required": [
    "postcode"
  ],
  "properties": {
    "postcode": {
      "type": "string"
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
560 ms
95th percentile latency
560 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 560 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http japan-postal-code-lookup-mcp https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add japan-postal-code-lookup-mcp --url https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable japan-postal-code-lookup-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "japan-postal-code-lookup-mcp": {
      "url": "https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "japan-postal-code-lookup-mcp": {
      "type": "streamableHttp",
      "url": "https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start japan-postal-code-lookup-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "japan-postal-code-lookup-mcp": {
      "type": "http",
      "url": "https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http japan-postal-code-lookup-mcp https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "japan-postal-code-lookup-mcp": {
      "url": "https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "japan-postal-code-lookup-mcp": {
      "serverUrl": "https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp"
    }
  }
}

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