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<!DOCTYPE html>
<!--
TopoJSON sources:
- CH: swiss-maps (https://github.com/interactivethings/swiss-maps), CC BY 4.0 swisstopo
- AT: GeoJSON-TopoJSON-Austria (https://github.com/ginseng666/GeoJSON-TopoJSON-Austria), CC BY 4.0 Statistik Austria
- DE: BKG VG250 via B42Labs/mxmap (https://github.com/B42Labs/mxmap), © GeoBasis-DE / BKG
-->
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
<link rel="preconnect" href="https://unpkg.com" crossorigin>
<link rel="preconnect" href="https://a.basemaps.cartocdn.com" crossorigin>
<link rel="preconnect" href="https://b.basemaps.cartocdn.com" crossorigin>
<link rel="preconnect" href="https://c.basemaps.cartocdn.com" crossorigin>
<link rel="preconnect" href="https://d.basemaps.cartocdn.com" crossorigin>
<title>Email Providers of DACH Municipalities</title>
<meta name="description" content="Interactive map showing the email providers of ~15,300 municipalities in Germany, Austria, and Switzerland, based on DNS analysis.">
<link rel="apple-touch-icon" sizes="180x180" href="favicon/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="favicon/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="favicon/favicon-16x16.png">
<link rel="manifest" href="favicon/site.webmanifest">
<link rel="stylesheet" href="css/shared.css">
<link rel="stylesheet" href="css/map.css">
<link rel="preload" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
<noscript><link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"></noscript>
<script defer src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
<script defer src="https://unpkg.com/topojson-client@3/dist/topojson-client.min.js"></script>
<script defer src="js/nav.js"></script>
<script defer src="js/map-shared.js"></script>
<script defer src="js/map-providers.js"></script>
</head>
<body>
<header id="header">
<div class="header-left">
<h1 class="brand"><a href="index.html">Municipality Emails</a></h1>
<nav id="nav"></nav>
</div>
<div class="header-right">
<button class="toggle-info" id="toggle-info" aria-expanded="true" aria-controls="info-bar">About ▴</button>
</div>
</header>
<section id="info-bar" aria-label="About this project">
<script>if(window.innerWidth<=600)document.getElementById('info-bar').classList.add('collapsed');</script>
<h2 class="info-title">Email Providers of DACH Municipalities</h2>
<div class="info-grid">
<div class="info-card">
<h3>What is this?</h3>
<p>A map of ~15,300 municipalities in Germany, Austria, and Switzerland showing which provider handles their official email, grouped by jurisdiction, based on public DNS records and other public network signals.</p>
</div>
<div class="info-card">
<h3>Context</h3>
<p>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.</p>
</div>
<div class="info-card">
<h3>How does it work?</h3>
<p>Each municipality's official domain is checked via DNS records, SMTP banners, ASN lookups, and other signals, then classified by provider type with confidence scoring.</p>
</div>
<div class="info-card">
<h3>Open source & open data</h3>
<p>Part of an ongoing research project. The code and data are on <a href="https://github.com/mxmap/secassure2026" target="_blank">GitHub</a>.</p>
<p id="generated"></p>
</div>
</div>
</section>
<main id="map" role="application" aria-label="Interactive map of DACH municipality email providers">
<div id="map-loading" style="position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:1000;background:rgba(255,255,255,0.85);font-size:15px;color:#555;">Loading map data…</div>
</main>
<script>
document.addEventListener('DOMContentLoaded', function () {
loadUnifiedProviderMap(
{ center: [49, 10.5], zoom: 6, minZoom: 4 },
[
{
label: 'Germany',
topoUrl: 'topo/de-gemeinden.json',
dataUrl: 'output/providers/providers_de.min.json',
topoObject: 'VG250_GEM',
featureCodeFn: function(f) { return String(f.id); },
domesticCategory: 'de-based',
domesticLabel: 'Germany Based',
domesticTLDs: ['.de'],
REGION_CODES: {
'Schleswig-Holstein': 'SH', 'Hamburg': 'HH', 'Niedersachsen': 'NI',
'Bremen': 'HB', 'Nordrhein-Westfalen': 'NW', 'Hessen': 'HE',
'Rheinland-Pfalz': 'RP', 'Baden-Württemberg': 'BW', 'Bayern': 'BY',
'Saarland': 'SL', 'Berlin': 'BE', 'Brandenburg': 'BB',
'Mecklenburg-Vorpommern': 'MV', 'Sachsen': 'SN', 'Sachsen-Anhalt': 'ST',
'Thüringen': 'TH'
},
},
{
label: 'Austria',
topoUrl: 'topo/at-gemeinden.json',
dataUrl: 'output/providers/providers_at.min.json',
topoObject: 'gemeinden',
featureCodeFn: function(f) {
var iso = String(f.id || (f.properties && f.properties.iso) || '');
if (iso !== '90001' && iso.startsWith('9')) return '90001';
return iso;
},
domesticCategory: 'at-based',
domesticLabel: 'Austria Based',
domesticTLDs: ['.at', '.gv.at'],
REGION_CODES: {
'Burgenland': 'B', 'Kärnten': 'K', 'Niederösterreich': 'NÖ',
'Oberösterreich': 'OÖ', 'Salzburg': 'S', 'Steiermark': 'ST',
'Tirol': 'T', 'Vorarlberg': 'V', 'Wien': 'W'
},
},
{
label: 'Switzerland',
topoUrl: 'https://unpkg.com/swiss-maps@4.7.0/2026/ch-combined.json',
dataUrl: 'output/providers/providers_ch.min.json',
topoObject: 'municipalities',
featureCodeFn: function(f) { return String(f.id); },
domesticCategory: 'ch-based',
domesticLabel: 'Swiss Based',
domesticTLDs: ['.ch', '.swiss'],
REGION_CODES: {
'Kanton Zürich': 'ZH', 'Kanton Bern': 'BE', 'Kanton Luzern': 'LU',
'Kanton Uri': 'UR', 'Kanton Schwyz': 'SZ', 'Kanton Obwalden': 'OW',
'Kanton Nidwalden': 'NW', 'Kanton Glarus': 'GL', 'Kanton Zug': 'ZG',
'Kanton Freiburg': 'FR', 'Kanton Solothurn': 'SO', 'Kanton Basel-Stadt': 'BS',
'Kanton Basel-Landschaft': 'BL', 'Kanton Schaffhausen': 'SH',
'Kanton Appenzell Ausserrhoden': 'AR', 'Kanton Appenzell Innerrhoden': 'AI',
'Kanton St. Gallen': 'SG', 'Kanton Graubünden': 'GR', 'Kanton Aargau': 'AG',
'Kanton Thurgau': 'TG', 'Kanton Tessin': 'TI', 'Kanton Waadt': 'VD',
'Kanton Wallis': 'VS', 'Kanton Neuenburg': 'NE', 'Kanton Genf': 'GE',
'Kanton Jura': 'JU'
},
}
]
).catch(handleLoadError);
});
</script>
</body>
</html>