libgeo-postcode-perl - 0.17+dfsg1-1.1 main

Geo::Postcode will accept full or partial UK postcodes, validate them against
the official spec, separate them into their significant parts, translate them
into map references or co-ordinates and calculate distances between them.
.
The last two features require a postcode database to be supplied separately.
.
It does not check whether the supplied postcode exists: only whether it is
well-formed according to British Standard 7666, which you can find here:
.
http://www.govtalk.gov.uk/gdsc/html/frames/PostCode.htm
.
Geo::Postcode will also work with partial codes, ie areas, districts and
sectors. They won't validate, but you can test them for legitimacy with a
call to valid_fragment, and you can still turn them into grid references.
.
To work with US zipcodes, you need Geo::Postalcode instead.