Rapid Addressing

Put in the postcode - Get the address

Address Management

Rapid addressing; postcode identification and more

Mailing List Generation

Build mailing lists for bulk mailing for free

Web Use

Get a visitor's address and position from their postcode

Where's My Nearest?

Find the local branches of a business

Map Referencing

Pinpoint the map position of postcode


Postal codes and addresses for the Republic of Ireland


The Republic of Ireland has now introduced a postal code system under the name "Eircodes". As befits a twenty-first Century system it is very advanced and each Eircode references a specific premise. Eircodes have the general form: T22 FNT4. The first part of three characters defines the post town for deliveries and the second part of four characters is a unique identifier for each premise.

The Arc en Ciel package covers all of Ireland: Eircodes in the Republic, and UK postcodes for Northern Ireland. The package is principally used to integrate postal code lookup and searching into almost any Windows application. The package includes a useful desktop app: "AddressIRL" for quick lookup, searching and copying as below:-

Eircode Application Window

Click the animation below to see it in action.


Our free programmers' toolkit has a range of facilities covering all popular Windows languages and systems. See our developers' page for more details.

Eircode logo  


2 €360
5 €810
10 €1530
20 €2880
Unlimited* €12,000


*An Unlimited Licence allows use by any number of the end-user's employees.

Prices do not include VAT or delivery.

Prices include support for the licence year. Updates can be downloaded from our website each quarter.

Annual renewal is required while the software is in use. See here for full Eircode conditions and here for full Royal Mail licensing details.