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Postcode Lookup
Search and validate UK addresses with a postcode
Use the most familiar and fastest way to find an address with our postcode search service

  • Try it Yourself

Integrate Postcode Lookup on any website with our JavaScript plugin

Why Use Postcode Lookup?

Great user experience

Great User Experience

Postcode lookup is the most familiar and fastest way to accurately retrieve an address in the UK

Easy to integrate

Easy to Integrate

We provide ready-made, customisable postcode finder libraries with excellent technical and account support to get you started quickly

Data quality

Ensure Data Quality

Retrieve the correct postcode addresses with every search. Our address datasets are updated everyday

Why Ideal Postcodes?

Cutting edge

Cutting Edge

The most fully-featured UK address validation and postcode lookup tools available

Incredibly accurate

Unmatched Accuracy

Access the UK's most accurate data with rootftop accurate geolocations, UPRN and more

Quality support

Well Supported

Simple integration with clear documentation, open-source libraries and live support

GDPR compliant

Data Protected

GDPR Compliant. Your customer data never leaves our UK and EU data centres

Agile framework

Agile Framework

Scale your business and improve operations with a faster and more efficient process

High quality

High Quality

Ideal Postcodes embraces continuous improvement and launches industry leading solutions

Social Responsibility

Social Responsibility

We believe in giving back to the community. Our address validation solutions provide screen reader compatibility



Easy products, integrations, documentation, simplified billing and a great user interface

Flexible Licensing

As Royal Mail Postcode Address File specialists we provide niche licensing options


Public Sector

Make full use of address data with cost-effective licensing for public sector organisations


Small charities can benefit from cost-effective plans to increase website donations, gift aid registration and to speed up in-person collection

Trusted by Many

We work with developers across small businesses and startups through to public and FTSE 100 organisations

Client Logos

Postcode Lookup API

Start searching postcodes in moments with our ready made libraries

const { Client, lookupPostcode } = require("@ideal-postcodes/core-node");

const client = new Client({ api_key: "iddqd" });

await lookupPostcode({ client, postcode: "EX5 1NA"});