# jp.addresstozip/address-to-zip (remote · addresstozip.jp)

日本の住所と郵便番号を相互変換するMCPサーバー。住所から郵便番号を検索、郵便番号から住所を逆引きします。

- Trust score: 67/100 (medium)
- Change this week: +2
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `addresstozip.jp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip.md), [page](https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip)

## Channel facts

- Endpoint: `https://addresstozip.jp/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 76/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 312 tokens (~156/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

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

### Codex

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

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "jp-addresstozip-address-to-zip": {
      "type": "remote",
      "url": "https://addresstozip.jp/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add jp-addresstozip-address-to-zip --url https://addresstozip.jp/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  jp-addresstozip-address-to-zip:
    url: "https://addresstozip.jp/mcp"
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 66, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 65, −2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 65, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 65)

First indexed and scored.

## MCP tools (2)

### `search_address` (~144 tokens)

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。

Input parameters:

- `address` (string, required): 検索する住所(例: 東京都千代田区丸の内 / Marunouchi, Chiyoda-ku, Tokyo)
- `limit` (integer): 返却件数の上限(1-50・既定10)

### `lookup_zipcode` (~110 tokens)

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。

Input parameters:

- `zipcode` (string, required): 郵便番号(例: 100-0005 または 1000005。全角数字・ハイフン有無も可)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip#diagnostics

## Score history

- 2026-08-03: 67
- 2026-08-02: 67
- 2026-08-01: 66
- 2026-07-31: 66
- 2026-07-30: 65
- 2026-07-29: 67
- 2026-07-28: 66
- 2026-07-27: 65
- 2026-07-26: 65

## Links

- Remote endpoint: https://addresstozip.jp/mcp
- Website: https://addresstozip.jp/
- Changelog RSS feed: https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip/changelog.json
- HTML version of this page: https://verifymcp.io/servers/jp-addresstozip-address-to-zip/addresstozip