Start with the address
Paste the full address and let the parser find the country, city and code.
COMPARE · POSTCODEDOG VS POSTCODES4U
PostcodeDog vs Postcodes4u
Postcodes4u is a directory. PostcodeDog is a paste-and-check lookup for 82 countries.
Postcodes4u is a UK postcode and address lookup. PostcodeDog covers 82 countries with one lookup, batch checks, a free API and MCP.
SIDE BY SIDE
What changes with PostcodeDog
| Capability | UsPostcodeDog | Postcodes4u | Why it matters |
|---|---|---|---|
| Coverage | 82 countries in one lookup | UK focus | Cross-border orders rarely stop at one market. |
| Input | Paste an address, city or code; country and format detected | Browse the directory | Use the text the customer sent. |
| Batch | Paste up to 50 rows, review, export CSV | One lookup at a time | Clear a label queue in one pass. |
| Developer | Free JSON API and MCP server, no key | Directory-first | Automate without scraping a directory. |
| Workflow | Platform and carrier pages | Generic lookup | The answer sits next to the task. |
WHERE POSTCODEDOG WINS
One box instead of a directory crawl.
Batch before the label run
Fifty rows per run, with valid, ambiguous and missing statuses and CSV export.
Agents connect directly
The MCP server exposes lookup, search and validation to AI clients.
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 Postcodes4u
Postcodes4u is a UK postcode and address lookup.
It is a postal-code directory organized by country and city.
When PostcodeDog is the better fit
- 01You fill foreign addresses, not only one country.
- 02You want a paste-and-check workflow.
- 03You need a free batch check.
- 04You want an API or MCP server.
Does PostcodeDog cover UK?
Yes. UK is one of 82 countries in the lookup.
Is PostcodeDog affiliated with Postcodes4u?
No. Postcodes4u is an independent directory; PostcodeDog is a separate lookup.
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
Try PostcodeDog instead of Postcodes4u.
Try 90210, SW1A or 100-0001. No signup, no credit card.