Japan Postal Code Lookup

Resolve Japanese 〒 postcodes to prefecture, city and town — batch lookups for your AI agent.

For logistics, CRM and Japan address enrichment. Free: one lookup. Pro: batch and all matches.

Free tier: postal_lookup, no sign-up. Pro: ¥900/month — all tools, unlimited use. Cancel anytime (one click on the success page, or email).

Subscribe — ¥900/month

Tools

postal_lookup (free) — FREE. Resolve a 7-digit Japanese postcode to prefecture/city/town.
batch_postal (Pro) — PRO. Resolve up to 50 Japanese postcodes.
all_matches (Pro) — PRO. All address matches for one postcode (some codes span multiple towns).

Live free example

postal_lookup {"postcode":"1000001"}

{
  "postcode": "1000001",
  "result": {
    "address1": "東京都",
    "address2": "千代田区",
    "address3": "千代田",
    "kana1": "ﾄｳｷｮｳﾄ",
    "kana2": "ﾁﾖﾀﾞｸ",
    "kana3": "ﾁﾖﾀﾞ",
    "prefcode": "13",
    "zipcode": "1000001"
  },
  "message": null,
  "pro": "Batch of 50 postcodes and all matches for one code: https://jp-postal-lookup-mcp.donniertf.workers.dev/buy",
  "disclaimer": "Japanese postal code (〒) lookup via Zipcloud. Official Japan Post derived data."
}

Connect (MCP)

Add https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp to Claude, Cursor or any MCP client (Streamable HTTP, no login for the free tier). Subscribers pass access_token or Authorization: Bearer.

Important

Japanese postal code (〒) lookup via Zipcloud. Official Japan Post derived data.

Data sources & licences

Zipcloud Japan Postcode API (https://zipcloud.ibsnet.co.jp/)

For AI agents

llms.txt · server card · pricing.json · POST /checkout → checkout URL · GET /token?session_id= → access token.

More Japan data MCPs

Save with Japan bundles: jp-mcp-bundles · GitHub hub.

Contact & cancelling

Questions, refunds or cancelling: dmorrisonwebdesign@gmail.com. Run by Donnie Morrison, UK. Payments by Stripe; we never see card details.