How do sites look up addresses from UK postcodes?

Posted by ctford on Stack Overflow See other posts from Stack Overflow or by ctford
Published on 2009-12-14T10:59:20Z Indexed on 2010/04/12 9:13 UTC
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U.K. that require addresses often ask the user to provide a postcode. The site then offers the user a choice between the addresses that match that postcode.

Where do these sites get the data to do this? Are there webservices that match postcodes to addresses? Do sites buy a database of addresses that they then query locally?

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