Check Japan and the next stop
Japan is one of 82 destinations. The same box handles a Japanese 〒, a US ZIP, a UK outcode or a German PLZ, so one order queue does not need four tools.
COMPARE · POSTCODEDOG VS JAPAN POST
PostcodeDog vs Japan Post Postal Code Search
One lookup for Japan and the rest of the route.
Japan Post’s official search is the reference for Japanese 〒 codes. PostcodeDog handles Japan alongside 81 other countries, with English and 12 other interface languages, so a support team can check a Japanese 〒 and the next destination in the same box.
SIDE BY SIDE
What changes with PostcodeDog
| Capability | UsPostcodeDog | Japan Post Postal Code Search | Why it matters |
|---|---|---|---|
| Coverage | 82 countries in one lookup | Japan only | The route may continue beyond Japan. |
| Input | Paste an address, city or code; country and format detected | Search by Japanese address, postcode or map | Support can use the text they already have. |
| Formats | Japan 7-digit, US ZIP, UK outcode, Germany 5-digit and more | Japanese 〒 | The destination sets the format. |
| Languages | 13 interface languages | Japanese-first official search | Global teams can work in their own language. |
| Batch and agents | Paste up to 50 rows, export CSV, call the free API or MCP | — | Clear a queue and connect agents from the same lookup. |
WHERE POSTCODEDOG WINS
A Japan check inside a global lookup.
Read the address the customer sent
Paste a 7-digit 〒 code or a romanized place name; the parser finds the country and place, and the country page keeps the 〒 format in view.
Give the whole team one tool
Support uses the box, operations uses the batch page, developers use the API and agents use MCP. One lookup, one set of answers.
TRY IT
Try the difference
Paste a full address, a city or a post code. Country and format are detected.
Free. No account, no API key.THE LOOP
Paste → resolve → verify
The same three steps work whether the address is a US ZIP, a UK outcode or a Japanese 〒.
- 01
Paste what you have
A full address, a city, or just a code. The parser accepts the whole line.
- 02
Confirm the place and format
Country, region and post code format are shown together, with nearby codes for a second option.
- 03
Send it to the label
Copy the verified code or export the batch. Platform and carrier pages keep local rules in view.
About
About Japan Post Postal Code Search
Japan Post’s postal code search finds a 7-digit Japanese postcode by address, postcode or map. It is the official reference for Japanese addresses and delivery rules.
PostcodeDog covers Japan alongside 81 other countries, with address paste, format detection, batch, API and MCP. It is not affiliated with Japan Post.
When PostcodeDog is the better fit
- 01Your destinations include Japan and at least one other country.
- 02Your support team is not Japanese-speaking.
- 03You want a free batch check before a label run.
- 04You want an API or MCP server for AI clients.
Is PostcodeDog official for Japan?
No. Japan Post is the official source for Japanese postcodes and delivery rules. PostcodeDog is a separate lookup that covers Japan alongside 81 other countries.
Can PostcodeDog look up a Japanese 〒?
Yes. A 7-digit 〒 code or a romanized place name such as Chiyoda is accepted, and the Japanese interface is available at /ja.
Is PostcodeDog free?
Yes. Lookups, batch checks, the JSON API and the MCP server are free and need no account.
Can I use it in an AI agent?
Yes. The MCP server is at /mcp, and the JSON API is free to call.
Compare
Check Japan and the next stop.
Try 100-0001, 90210 or SW1A in the same box. No signup needed.