Address To Zip MCP Server

by addresstozip Your server? Claim it

answering

Address To Zip is answering right now. Last checked 9 min ago. It exposes 2 tools.

日本の住所⇄郵便番号を変換。表記ゆれも吸収。Japan address ⇄ postal code, handles messy input. Free tier, no API key.

Uptime history 52 days of history · worst day 94%

52 days agonow

96.7%

Uptime 24h

88 of 91 checks

Tools

read from the server

386 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 9 September 2026. No other catalogue keeps this.

9 Sep 2 tool descriptions were rewritten lookup_zipcode, search_address

9 Sep 2 tools changed the parameters they ask for lookup_zipcode, search_address

9 Sep a tool changed version

Address To Zip does not always answer

Over the last week it answered 98.4% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add address-to-zip --transport http https://addresstozip.jp/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.address-to-zip]
url = "https://addresstozip.jp/mcp"

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

address

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, street numbers and building names) and resolves down to the town level. Romaji/English input is accepted. Results include Japan Post romaji.

lookup

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 include Japan Post romaji.

Endpoints

URL	Transport	State	Latency	Checked
https://addresstozip.jp/mcp	streamable-http	answering	403 ms	9 min ago

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Address To Zip — questions

Answers built from our own checks of this server.

What can Address To Zip do?

It exposes 2 tools, read directly from the server on our last check. Among them: lookup_zipcode, search_address. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Address To Zip working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 88 of 91 checks got a reply (96.7%), average response time 386 ms. The bar chart above shows every period we have measured.

How do I connect Address To Zip?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Address To Zip need an API key?

No. Address To Zip completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Address To Zip?

It answers our handshake in 386 ms on average, which is faster than 42% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.