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pafaddressbase

This endpoint returns one or more Royal Mail PAF addresses for a given postcode or part of an address, enriched with data from the property records in either AddressBase Core or AddressBase Premium where the UPDRN of the PAF address matches the UDPRN in the AddressBase property record.

Your API key determines whether you access AddressBase Core or AddressBase Premium.

AddressBase: Enable access on your API key using the Features page or by contacting us.

Request URL

GET https://ws.postcoder.com/pcw/{apikey}/pafaddressbase/{searchterm}

Path parameters

ParameterDescriptionExample
apikeyYour API keyPCW45-12345-12345-1234X
searchtermThe URL-encoded postcode or part of an address that you wish to look upnr1%201ne

Querystring parameters

ParameterDescriptionExample
formatSets the format of the response, xml or json (default unless "application/xml" header is detected)format=json
identifierSpecifies your own meaningful identifier for the request such as "websiteA" or "client123"; you can view usage for each identifier on the Identifier Usage page, which may be helpful when using your API key across multiple websites, apps or clientsidentifier=websiteA
linesSets the number of address lines (1-9) to include in the response so you can mirror the layout of your existing address form; use include and exclude below to further customise the address lineslines=3
includeSpecifies the extra address fields to include within the address lines using a comma-delimited list, supported values: county, posttown, postcodeinclude=county,posttown,postcode
excludeSpecifies the address fields to exclude within the address lines using a comma-delimited list, supported values: pobox, organisation, departmentname, buildingname, subbuildingname, number, premise, dependentstreet, street, doubledependentlocality, dependentlocalityexclude=organisation
addtagsSpecifies the extra address fields to include within the response using a comma-delimited list, supported values: addressbase (for all fields), uprn, deliverypointaddress, lpis, blpu, classifications, organisations, applicationcrossreferences, tile, latitude, longitude. You can also include a selection of non-AddressBase fields, see additional response fields below for the full listaddtags=addressbase
postcodeonlyLimits the request to a postcode-only search rather than matching the search term on other parts of an address, true or false (default)postcodeonly=true
callbackSpecifies the name of your JSONP callback functioncallback=jsoncallback
pageSpecifies the page of results to return where page zero is the first, 0 (default), 1, 2...page=1

Example request and response

Return UK addresses from PAF with a postcode of NR1 4DH and include up to 3 address lines in the response, along with additional data from the associated property records found in AddressBase:

GET https://ws.postcoder.com/pcw/PCW45-12345-12345-1234X/pafaddressbase/nr1%204dh?format=json&lines=3

[
	{
		"addressline1": "The Dean & Chapter of Norwich Cathedral",
		"addressline2": "Chapter Office",
		"addressline3": "65 The Close",
		"summaryline": "The Dean & Chapter of Norwich Cathedral, Chapter Office, 65 The Close, Norwich, Norfolk, NR1 4DH",
		"organisation": "The Dean & Chapter of Norwich Cathedral",
		"subbuildingname": "Chapter Office",
		"number": "65",
		"uniquedeliverypointreferencenumber": "17308537",
		"premise": "Chapter Office, 65",
		"street": "The Close",
		"posttown": "Norwich",
		"county": "Norfolk",
		"postcode": "NR1 4DH",
		"latitude": "52.6308744",
		"longitude": "1.3009883",
		"grideasting": "623485.0",
		"gridnorthing": "308793.0",
		"uprn": "200004353841",
		"usrn": "28920601"
	}
]

Response fields

FieldDescriptionExample
summarylineThe address given in a single field separated by commas. Where matched against PAF this is a postal addressThe Dean & Chapter of Norwich Cathedral, Chapter Office, 65 The Close, Norwich, NR1 4DH
addressline1The first address line, where the total number of address lines is defined by the lines querystring parameterThe Dean & Chapter of Norwich Cathedral
addressline2The second address lineChapter Office
addressline3The third address line65 The Close
addressline4The fourth address line
addressline5The fifth address line
addressline6The sixth address line
addressline7The seventh address line
addressline8The eighth address line
addressline9The ninth address line
organisationOrganisation name. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council recordsThe Dean & Chapter of Norwich Cathedral
departmentnameWhere there is a distinct delivery point for receipt of mail for a department, the department name is indicated here. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council records
poboxWhere linked to a PAF PO Box holder, this is the PO Box number. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council records
subbuildingnameSub-building name – usually a unit number or flat number. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council recordsChapter Office
buildingnameName of the building. For instance Nelson House. May or may not be further sub-divided. Often contains what Royal Mail would class as a Dependent Street. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council records
numberThe street number. Note that this may be alpha numeric. E.g. 1A. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council records65
uniquedeliverypointreferencenumberRoyal Mail's unique identifier for a Delivery Point (i.e. where postal delivery staff go to deliver mail). Assigned by Royal Mail and only available where an address record has been matched against PAF. Provides a unique identifier and designed to be unique over the life time of a delivery point17308537
premiseA concatenation of the Department, PO Box, Sub-building Name, Building Name and Number (in that order). Useful if you have a single field in your database for storing the premiseChapter Office, 65
dependentstreetA street that needs another one for access. For example a cul-de-sac or a named parade of shops on a main road
streetThe main street on which a property is situated. Commonly seems to be a main road especially in rural and remote settings. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council recordsThe Close
doubledependentlocalityThis is a smaller industrial estate or sub-division of a town or village. The data in this field comes from Royal Mail if the record has been matched to a delivery point but the equivalent data from council records goes into Dependentlocality
dependentlocalityThis is analogous to Royal Mail's Double Dependent Locality and is generally representative of retail parks or industrial estates. Source: Council records or, if PAF matched, Royal Mail
townnameThis is analogous to Royal Mail's Dependent Locality and represents a suburb or small town. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council records
posttownWhere an address record has been matched against PAF, this is the post town responsible for mail sorting. Source: Royal Mail where matched to a PAF delivery point where there is a deliverypointaddress record shown in AddressBase Premium or council recordsNorwich
postcodeThis is the Postcode assigned by Royal MailNR1 4DH
deliverypointsuffixThe Delivery Point Suffix used by Royal Mail. This, along with a Postcode, provides a unique identifier for a delivery point at a point in time. Source: Royal Mail
latitudeThis is the latitude on the ETRS89 projection. See rpc52.6308744
longitudeThis is the longitude on the ETRS89 projection. See rpc1.3009883
grideastingThe Easting on Ordnance Survey's British National Grid. The units are in metres to 2 decimal places. See rpc623485.00
gridnorthingThe Northing on Ordnance Survey's British National Grid. The units are in metres to 2 decimal places. See rpc308793.00
uprnThe Unique Property Reference Number – the primary key field for AddressBase data. Assigned by GeoPlace or Ordnance Survey200004353841
parentuprnWhere a particular property is part of another one (for example a flat in a block of flats or a unit on a business park) the owning property's UPRN is indicated here. Please note that this is not the same as Royal Mail's multiple residence indicator for postal purposes but is a good indicator that this is not a stand-alone property
usrnThe Unique Street Reference Number – every street under council control has its own unique identifier and this is it28920601
changecodeIndicates how this record was last amended on the national hub. AddressBase Core only
toidThe topographical identifier which associates this record with OS MasterMap. AddressBase Core only
classificationcodeDescribes the classification of the property according to council recordsCO01
rpcTells you how accurate the coordinates are. For safety critical applications this may be a particularly important field:


1 – Central Internal Position – The address is contained within an OS MasterMap Topography Later building and within 2.5m of its calculated centre. Or the coordinates represent the best possible position based on the nature of the premises

2- General Internal Position – The address is contained within an OS MasterMap Topography Later building but is more than 2.5m away from its calculated centre. Or the seed is in an internal position based on the nature of the premises

3 – Transitional Position – The address has been changed from Under Development to Live within the last 6 months. It has been captured to a high level of positional accuracy but pending large scale mapping updates still may be moved

4 – Street Location – The address is plotted in accordance with the declared street start and end coordinates

5 – Postcode Unit position – The address has been captured to Postcode Unit level and will be updated when more information becomes available. It is likely that every property on the Postcode will be sharing these same coordinates

9 – Low Accuracy – The address has been captured to a lower level of accuracy and will be updated as a priority over the coming months
1
gsscodeProvided by the Office for National Statistics and used for official records. Codes are structured: the first three characters are an Entity Code and the remaining 6 characters are the particular instance. Entity Codes are: E06 (Unitary Authority); E07 (Local Authority District Council); E08 (Metropolitan Borough Council); and E09 (London Borough)
lastupdatedateThe date this record was last updated
morevaluesSet to true when there is at least one more page of results to requesttrue
nextpageThe page number for the next page of results to request2
totalresultsThe total number of results when there are multiple pages of results458

Additional response fields

Use the addtags querystring parameter to specify a comma-delimited list of fields that you wish to add to the response. For example, to add latitude, longitude and udprn:

GET https://ws.postcoder.com/pcw/...?format=json&lines=2&addtags=latitude,longitude,udprn

FieldDescriptionExample
Coordinate data
latitudeETRS89 latitude (ideal for use with mapping APIs)52.6299163702
longitudeETRS89 longitude (ideal for use with mapping APIs)1.3018030246
latitudeosgbOSGB36 latitude52.6294875459
longitudeosgbOSGB36 longitude1.3035999409
grideastingEasting OS Grid Reference (1m precision in units of 1m)623545
gridnorthingNorthing OS Grid Reference (1m precision in units of 1m)308689
Address fields
deliverypointsuffixDelivery Point Suffix3JS
uniquedeliverypointreferencenumberUnique Delivery Point Reference Number (UDPRN); there is no additional credit cost for including this field; you can also use addtags=udprn50959190
multipleoccupancycountMultiple Occupancy Count - count of the number of multiple occupancy addresses for the delivery point0
administrativecountyAdministrative County (top tier local government)Norfolk
postalcountyFormer Postal County
traditionalcountyTraditional CountyNorfolk
usercategoryUser Category ('R' for Residential, 'N' for Non-residential, 'L' for Large User)N
sortcodeSortcode for Royal Mail Mailsort35529
countrycodeCountry code within the United Kingdom064
countryCountry name within the United KingdomEngland
welsh_dependentstreetWelsh language alternative for dependent street field
welsh_streetWelsh language alternative for street field
welsh_doubledependentlocalityWelsh language alternative for double dependent locality field
welsh_dependentlocalityWelsh language alternative for dependent locality field
welsh_posttownWelsh language alternative for post town field
Special PAF keys
The uniquedeliverypointreferencenumber is populated across countries and is the recommended primary key. For Royal Mail PAF addresses only, the following keys can be used as a composite primary key in this order: addresskey,organisationkey,postcodetype.
addresskeyThe 8-digit PAF Address Key from Royal Mail (UK only)00001000
organisationkeyThe 8-digit PAF Organisation Key from Royal Mail (UK only, '0' for Residential Small Users and Large Users)00456120
postcodetypeThe PAF Postcode Type from Royal Mail (UK only, 'S' for Small Users, 'L' for Large Users)S
Census data
oa112011 Census Output AreaE00136551
lsoa112011 Census Lower Layer Super Output AreaE01033438
msoa112011 Census Middle Layer Super Output AreaE02006907
NHS data
commissioningregioncode_gssNHS Commissioning Region Code (ONS GSS)E40000007
commissioningregionnameNHS Commissioning Region NameNHS England East of England
areateamcode_nhsNHS Area Team Code (NHS)QMM
areateamcode_gssNHS Area Team Code (ONS GSS)E54000022
areateamnameNHS Area Team NameNHS Norfolk and Waveney Integrated Care Board
clinicalcommissioninggroupcode_nhsNHS Clinical Commissioning Group Code (NHS)26A
clinicalcommissioninggroupcode_gssNHS Clinical Commissioning Group Code (ONS GSS)E38000239
clinicalcommissioninggroupnameNHS Clinical Commissioning Group NameNHS Norfolk and Waveney ICB - 26A
Government data
localauthoritywardcodeLocal Authority Ward Code33UGGC
localauthoritycodeLocal Authority CodeE07000148
localauthoritynameLocal Authority NameNorwich
electoralwardcodeElectoral Ward CodeE05012910
electoralwardnameElectoral Ward NameThorpe Hamlet
electoralcountycodeElectoral County CodeE10000020
electoralcountynameElectoral County NameNorfolk
parliamentaryconstituencycodeWestminster Parliamentary Constituency CodeE14000864
parliamentaryconstituencynameWestminster Parliamentary Constituency NameNorwich South
europeanelectoralregioncodeEuropean Electoral Region CodeE15000006
europeanelectoralregionnameEuropean Electoral Region NameEastern
nationalparkcodeNational Park CodeS21000003
nationalparknameNational Park NameThe Cairngorms National Park

Integration advice

  • URL encode all special characters (including /) in your request parameters with %xx encoding
  • Verify your request was successful by checking for an HTTP status code of 200; see all HTTP status codes with descriptions
  • When using your API key across multiple websites, apps or clients, set the identifier querystring parameter to a meaningful value such as "websiteA" or "client123"; you'll then be able to view these identifiers and the number of requests made by each one on the Identifier Usage page
  • Treat all response fields as optional
  • Use these fields on your UK address form: addressline1, addressline2, addressline3, posttown, postcode (county is no longer required in UK addresses)

Credit cost

Each request costs 4.5 credits.

Buy a credit pack or set up a monthly plan to use with all Postcoder endpoints.