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Handy articles on UK and global address verification
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Address Validation
Address Validation
What Is Address Validation and How Does It Work?
UK Address InformationThe UK Postcode Format
A comprehensive outline of UK postcode patterns, its constituent components and how they can be utilised. Split a postcode into outward code, inward code, postcode area, district code, sub-district code, postcode sector and postcode unit.
OtherWhat Is A Lookup and a Credit?
How Credits Are Counted Across Ideal Postcodes Address Search and Validation APIs
All Guides
48 guidesUK Address Information
7 guides
Postcode FactsGBRInteresting Facts and Information About Postcodes2 minAug 2026→Postcode AreasGBRA complete list of UK postcode areas and regions5 minAug 2026→Missing AddressGBRWhy Your Address Might Not Be Showing on Royal Mail's Postcode Address File. We list the top reasons why this might happen and what you can do about it.2 minAug 2026→The UK Postcode FormatGBRA comprehensive outline of UK postcode patterns, its constituent components and how they can be utilised. Split a postcode into outward code, inward code, postcode area, district code, sub-district code, postcode sector and postcode unit.4 minJun 2026→Thoroughfare DescriptorsGBRList of Thoroughfare & Dependent Thoroughfare descriptors in the UK1 minJan 2022→UK Address GuidelinesGBREnsure your mail is correctly addressed with our UK clear addressing guidelines3 minFeb 2021→Postcode Data List DirectoryGBRLinks to Downloads of Various UK Postcode Data Lists1 minJan 2021→
Address Data
17 guides
Office for National Statistics Postcode Directory (ONSPD) LicensingGBRONSPD Licensing: How Data from Postcodes.io Can Be Used1 minSep 2026→Non-Unique AddressesIRLWhat is a non-unique address1 minAug 2026→NACE CodesNomenclature of Economic Activities - The Four Digit Classification Code2 minAug 2026→What is GaeltachtIRLThe significance of Gaeltacht and preserving the Irish language - Gaelic1 minAug 2026→What is an EircodeIRLEircode is a postcode system used in Ireland to identify properties and improve mail delivery. It consists of a seven-character code. Find out more.2 minAug 2026→Eircode Products for BusinessIRLThe Eircode Address File (ECAF) and Eircode Address Database (ECAD)3 minAug 2026→What Is the Postcode Address File (PAF®)?GBRThe Most Accurate and Reliable Address Dataset for the UK, Provided by Royal Mail1 minAug 2026→Address DatabaseExtract UK Address Lists to Power Your Database and Bolster Your Marketing Strategies1 minJul 2026→USRN: Unique Street Reference NumberGBRUnderstanding the Unique Identifier for Every Street Across Great Britain1 minJul 2026→UPRN: Unique Property Reference NumberGBRWhat Is a UPRN, Its Uses and How It Complements the Postcode Address File5 minJul 2026→UDPRN: Unique Delivery Point Reference NumberGBRUnderstanding the Unique ID Number Assigned to Every Premise in the UK2 minJul 2026→Reverse Address GeocodingWhat is Reverse Geocoding and how is it useful?2 minJun 2026→Multiple ResidenceGBRWhat is the Multiple Residence dataset? Multiple residences in the UK are sub-premises situated within multiple occupancy buildings. Learn more on our guide.4 minJun 2026→What is Rooftop Geocoding?Understanding the Importance of Address Geocoding and Use Cases2 minNov 2022→PAF Alias DataGBRWhat is alias in a delivery address?1 minJun 2022→Not Yet Built DatasetGBRThe Not Yet Built Dataset Is an Additional Database from Royal Mail That Lists Properties Currently in Planning or under Construction2 minJan 2022→Allowed Characters in PAFGBRList of Characters Found in the Postcode Address File2 minJul 2021→
Address Validation
11 guides
Screen ReaderScreen reader compatibility is available for our address validation solutions2 minSep 2026→GlossaryA Glossary of Address Terms6 minJul 2026→Address ValidationWhat Is Address Validation and How Does It Work?2 minJul 2026→Implementing Address Validation SolutionsA Developer's Guide for Seamless Integration8 minJul 2026→Address CleanseUnderstanding Address Cleanse4 minJun 2026→Postcode ValidationHow to Validate a UK Postcode. Evaluating the Trade-offs for Various Solutions Including Postcode Lookup Services, Proprietary Postcode Datasets, Free Datasets and Regular Expressions (Regex)5 minJun 2026→Address Validation for Mobile DevicesHow to improve your mobile conversions1 minAug 2024→Fuzzy Address SearchHow you can reduce address entry errors and improve search results in real time2 minAug 2024→Address AutocompleteAddress autocomplete is a form function that helps users input addresses more accurately by providing real-time, valid address suggestions as they type.2 minNov 2023→Address Verification System or Address Validation?Address Verification System and Address Validation sound alike, but they are tools which have different uses1 minMar 2021→Postcode Lookup or Address FinderHow to Choose Between Postcode Lookup and Address Finder4 minFeb 2021→
Other
13 guides
What is Phone ValidationMaximising Efficiency and Accuracy with Phone Number Validation3 minJul 2026→What is Email ValidationUnderstanding the importance of email validation for accurate communication and data management3 minJul 2026→SublicensingHow Resellers License, Monitor and Bill Their Clients Under One Account2 minJun 2026→End User - Who Is Licensed to Use the Data?Identifying the Final User of Royal Mail's Dataset1 minJun 2026→Royal Mail Charity RegistrationGBRHow a Small Charity Gets Its Royal Mail PAF Licence Through Ideal Postcodes2 minJun 2026→MicroMkt Address ValidationAdd Address Validation to Your MicroMkt Suite in a Few Simple Steps2 minJun 2026→Run Postcodes.io Database LocallyGBRRun a Local Instance of the Latest Postcodes.io Database and Start Dispatching SQL Queries in Minutes2 minJun 2026→What Is A Lookup and a Credit?How Credits Are Counted Across Ideal Postcodes Address Search and Validation APIs3 minMar 2026→Enterprise Address Validation SolutionsStreamlining Operations and Data Management7 minApr 2024→Address Validation Solutions for SMEsBoosting Efficiency and Customer Satisfaction7 minApr 2024→Pricing PlansIdeal Postcodes' Available Pricing Plans2 minAug 2022→Quick Account Setup on Ideal PostcodesStep by Step Guide on Creating an Ideal Postcodes Account, Creating a Key and Enabling Automated Top-ups2 minFeb 2021→Internal User LicensingWhat Is an Internal User? When Is It Correct to License This Way?1 minJan 2021→