MXmap UK

What is this?

A map of UK local authorities showing which provider handles their official .gov.uk email — grouped by jurisdiction — based on public DNS records and other public network signals.

Context

Digital sovereignty: US-based providers are subject to the US CLOUD Act, which allows US authorities to request stored data, regardless of where it is physically hosted. This map makes the current provider landscape visible.

How does it work?

Each .gov.uk domain is checked via 11 signals from DNS records, SMTP banners, ASN lookups, and a public Microsoft API endpoint, then classified by provider type with confidence scoring.

Disclaimer: DNS records indicate mail routing and authorized senders, not necessarily where data is stored.

Open source & open data

The code and data are on Codeberg.
If you have noticed an error, please submit an issue.

Data sources: List of .gov.uk domains · UK counties

Credits

This project is a fork of mxmap.ch, created by David Huser, which maps Swiss municipalities. All credit for the original concept, pipeline design, and code goes to him. Adapted for the UK by Isaac.