How do sites look up addresses from UK postcodes?
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        Published on 2009-12-14T10:59:20Z
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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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