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UK Postcode Lookup Find and validate UK addresses with a postcode Setup a postcode finder in moments with our postcode search plugins and Postcode Lookup APIs

  • Try it Yourself

Maximum of 15 searches per day

Integrate Postcode Lookup on any website with our JavaScript plugin

Or use our Postcode JSON API directly

Take a look at our Address Finder for address autocompletion

Why Use Postcode Lookup?

Great User Experience

Postcode lookup is the most familiar and fastest way to accurately retrieve an address on a website or in an app. Search a postcode in just a few keystrokes

Easy to Integrate

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

Ensure Data Quality

Get the correct address every time to ensure deliverability. Our dataset is updated daily so you will get the most up-to-date information possible

Why Ideal Postcodes?

Flexible Pricing

Flexible Pricing

Choose between a flexible range of price tiers and licences. No tie-ins, no commitments. Contact us to find a licence that works better for you, or try our API for free

Simple Integration

Simple Integration

Integrate in moments with our drop-in code for your web pages, CRM & POS systems. We provide free technical support and additional resources to help you get started


Robust Software

We provide high quality and heavily tested software. It can be deployed anywhere and is readily customisable


High Data Quality

Our data is updated daily using Royal Mail's PAF dataset. Get access to the UK's most accurate and reliable address database


Built for Accessibility

Our Postcode Lookup plugin has accessibility standards (WAI-ARIA 1.0, 1.1) and other enhancements built in to cater to visually impaired users

Low latency

Low Latency

Our Postcode search API is designed from the ground up to be fast with median and 99th percentile response times under 20ms and 50ms respectively

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


Implement tools in your app or client projects. Register and monitor your client’s usage through modern and simple licensing options


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

Staff Usage

You can easily integrate our solutions to your internal data tools such as a CRM, Point of Sale system or custom application

Trusted by Many

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

Client Logos

Or call our Postcode API directly

Start searching postcodes in moments with our ready made libraries

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

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

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