Why your old address is no longer correct, and how to update it fast

Plenty of people are caught off guard when the address they have used for years suddenly “does not exist” on an online form. The reason is the 2025 round of administrative mergers, which renamed and combined many wards and communes, and even provinces. This article explains briefly why that happened, and how to bring your address up to date with diachimoi.net.

Why is the old address no longer correct?

When two or more administrative units are merged, the old name is replaced by a new one or moved to a different administrative level. The address on your ID card, your electronic household record, a contract or an order therefore drifts out of line with the administrative data currently in use.

What is the fastest way to update it?

• Go to diachimoi.net and enter the old address to get the correct new one.
• Convert many addresses in one go if you look after a customer list.
• Free, no app to install, no sign in required.

The site also has a guide section covering the questions that come up most often: how accurate the results are, who should use it, whether there is a fee, and so on. If you fill in online forms regularly, including topping up game cards or verifying a game account, having the correct new administrative address saves you a lot of trouble you did not need.