Address to ZIP MCP server

Which servers in the official MCP registry are Address to ZIP's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

← Back to Address to ZIP

Whose server it is

Registry namejp.addresstozip/address-to-zipverified in the MCP registry

The registry name sits under addresstozip.jp. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-20

Stateanswerschecked 2026-10-20
Tools2
Server calls itselfaddress-to-zip
Server version1.1.0
Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 91 ms.

Measured dailydaily checks: 1, the first on 2026-10-20

Answeredmeasuring1 of the 7 daily checks it takes to print a share
Median first answer178 ms
Space in an agent's context≈ 314 tokensthe definitions of all its tools (2), which an agent carries on every turn
Tool definitionsB · 83 of 100

Not saying whether it only reads or can destroy: 2 of 2

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The state of vendors' MCP servers: method and numbers →

Tools it offers2 tools · read 2026-10-20

search_address
日本の住所文字列から郵便番号を検索する。番地・建物名付きでも町名まで解釈する。ローマ字・英語表記(例: Marunouchi, Chiyoda-ku, Tokyo)でも検索可。結果には日本郵便準拠のローマ字表記(romaji)を含む。 / Look up a Japanese postal code from an address string. Tolerates messy input (full-width digits, hyphen variants…
lookup_zipcode
郵便番号から住所を逆引きする。100-0005 または 1000005 形式に対応(全角数字・ハイフン有無は不問)。結果には日本郵便準拠のローマ字表記(romaji)を含む。 / Reverse lookup: get the Japanese address for a postal code. Accepts 100-0005 or 1000005 (full-width digits and missing hyphens are fine). Results…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "address-to-zip": {
      "type": "http",
      "url": "https://addresstozip.jp/mcp"
    }
  }
}

OpenAPI spec

3 paths, read 2026-10-20. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.