diff --git a/common/pages.php b/common/pages.php
index 50cbfb4..1e0b667 100644
--- a/common/pages.php
+++ b/common/pages.php
@@ -1,115 +1,49 @@
 <?php
 
-switch (SERVICE) {
+define('TITLES', [
+		'index' => 'niver',
+		'auth' => [
+			'index' => 'Authentification',
+			'login' => 'Se connecter',
+			'register' => 'Créer un compte',
+			'password' => 'Changer la clé de passe',
+			'logout' => 'Déconnexion',
+		],
+		'reg' => [
+			'index' => 'Registre',
+			'register' => 'Enregistrer un nouveau domaine',
+			'unregister' => 'Effacer un domaine',
+			'ns' => 'Ajouter un enregistrement NS',
+			'ds' => 'Ajouter un enregistrement DS',
+			'glue' => 'Créer un Glue Record',
+		],
+		'ns' => [
+			'index' => 'Serveurs de noms',
+			'zone-add' => 'Ajouter une zone',
+			'zone-del' => 'Effacer une zone',
+			'dnssec' => 'Afficher les enregistrements DS',
+			'ip' => 'Enregistrements A et AAAA',
+			'ns' => 'Enregistrement NS',
+			'txt' => 'Enregistrement TXT',
+			'caa' => 'Enregistrement CAA',
+			'srv' => 'Enregistrement SRV',
+			'mx' => 'Enregistrement MX',
+			'sshfp' => 'Enregistrement SSHFP',
+			'tlsa' => 'Enregistrement TLSA',
+		],
+		'ht' => [
+			'index' => 'Hypertexte',
+			'add-http-onion' => 'Ajouter un accès HTTP par Onion',
+			'add-http-dns' => 'Ajouter un accès HTTP par DNS+TLS',
+			'del-http-onion' => 'Retirer un accès HTTP par Onion',
+			'del-http-dns' => 'Retirer un accès HTTP par DNS+TLS',
+			'le' => 'Installer un certificat Let\'s Encrypt',
+		],
+	]
+);
 
-	case "ns":
-		$page['service'] = "Serveurs de noms";
-		switch (PAGE) {
-			case "index":
-				$page['title'] = $page['service'];
-			break;
-			case "dnssec":
-				$page['title'] = "Obtenir les enregistrements DS";
-			break;
-			case "ip":
-				$page['title'] = "Enregistrements A et AAAA";
-			break;
-			case "ns":
-				$page['title'] = "Enregistrement NS";
-			break;
-			case "txt":
-				$page['title'] = "Enregistrement TXT";
-			break;
-			case "caa":
-				$page['title'] = "Enregistrement CAA";
-			break;
-			case "srv":
-				$page['title'] = "Enregistrement SRV";
-			break;
-			case "mx":
-				$page['title'] = "Enregistrement MX";
-			break;
-			case "sshfp":
-				$page['title'] = "Enregistrement SSHFP";
-			break;
-			case "tlsa":
-				$page['title'] = "Enregistrement TLSA";
-			break;
-			case "zone":
-				$page['title'] = "Gérer ses zones";
-			break;
-		}
-	break;
-
-	case "reg":
-		$page['service'] = "Registre";
-		switch (PAGE) {
-			case "index":
-				$page['title'] = $page['service'];
-			break;
-			case "ns":
-				$page['title'] = "Ajouter un enregistrement NS";
-			break;
-			case "register":
-				$page['title'] = "Enregistrer un nouveau domaine";
-			break;
-			case "unregister":
-				$page['title'] = "Effacer un domaine";
-			break;
-			case "glue":
-				$page['title'] = "Créer un Glue Record";
-			break;
-			case "ds":
-				$page['title'] = "Ajouter un enregistrement DS";
-			break;
-		}
-	break;
-
-	case "auth":
-		$page['service'] = "Authentification";
-		switch (PAGE) {
-			case "index":
-				$page['title'] = $page['service'];
-			break;
-			case "login":
-				$page['title'] = "Se connecter";
-			break;
-			case "register":
-				$page['title'] = "Créer un compte";
-			break;
-			case "password":
-				$page['title'] = "Changer la clé de passe";
-			break;
-			case "logout":
-				$page['title'] = "Déconnexion";
-			break;
-		}
-	break;
-
-	case "ht":
-		$page['service'] = "Hypertexte";
-		switch (PAGE) {
-			case "mkdir":
-				$page['title'] = "Créer un dossier de site";
-			break;
-			case "add-http-onion":
-				$page['title'] = "Ajouter un accès HTTP par Onion";
-			break;
-			case "add-http-dns":
-				$page['title'] = "Ajouter un accès HTTP par DNS+TLS";
-			break;
-			case "del-http-onion":
-				$page['title'] = "Retirer un accès HTTP par Onion";
-				break;
-			case "del-http-dns":
-				$page['title'] = "Retirer un accès HTTP par DNS+TLS";
-				break;
-			case "le":
-				$page['title'] = "Installer un certificat Let's Encrypt";
-			break;
-			case "index":
-				$page['title'] = $page['service'];
-			break;
-		}
-	break;
+if (SERVICE !== '') {
+	$page['service'] = TITLES[SERVICE]['index'];
+	if (PAGE !== 'index')
+		$page['title'] = TITLES[SERVICE][PAGE];
 }
diff --git a/fn/reg.php b/fn/reg.php
index 693c2ad..c865a97 100644
--- a/fn/reg.php
+++ b/fn/reg.php
@@ -19,8 +19,5 @@ function regCheckDomainPossession($domain) {
 }
 
 function regIsFree($domain) {
-	foreach (query('select', 'registry', ['domain' => $domain], 'domain')) {
-
-	}
-
+	return empty(query('select', 'registry', ['domain' => $domain], 'domain'));
 }
diff --git a/public/ns/index.php b/public/ns/index.php
index 2a07480..baee0b3 100644
--- a/public/ns/index.php
+++ b/public/ns/index.php
@@ -1,10 +1,14 @@
 <?php require "../../common/html.php"; ?>
 
 <dl>
-	<dt><a href="zone">Gérer ses zones</a></dt>
+	<dt><a href="zone-add">Ajouter une zone</a></dt>
 	<dd>
 		Pour qu'elle soit gérée par le serveur de noms de Niver
 	</dd>
+	<dt><a href="zone-del">Effacer une zone</a></dt>
+	<dd>
+		Effacer toutes les données d'une zone
+	</dd>
 	<dt><a href="dnssec">Obtenir les enregistrements <abbr title="Delegation Signer">DS</abbr></a></dt>
 	<dd>
 		À indiquer à la zone parente pour activer <abbr title="Domain Name System Security Extensions">DNSSEC</abbr>
diff --git a/public/ns/zone-add.php b/public/ns/zone-add.php
new file mode 100644
index 0000000..c270689
--- /dev/null
+++ b/public/ns/zone-add.php
@@ -0,0 +1,37 @@
+<?php require "../../common/html.php"; ?>
+
+<form method="post">
+	<label for="domain">Domaine</label><br>
+	<input required="" placeholder="domain.<?= PLACEHOLDER_DOMAIN ?>." id="domain" name="domain" type="text"><br>
+	<input value="Ajouter" type="submit">
+</form>
+
+<?php
+
+switchToFormProcess();
+
+checkAbsoluteDomainFormat($_POST['domain']);
+
+$db = new PDO('sqlite:' . DB_PATH);
+$stmt = $db->prepare("INSERT INTO zones(zone, username) VALUES(:zone, :username)");
+
+$stmt->bindValue(':zone', $_POST['domain']);
+$stmt->bindValue(':username', $_SESSION['username']);
+
+$stmt->execute();
+
+$knotZonePath = CONF['ns']['knot_zones_path'] . "/" . $_POST['domain'] . "zone";
+$knotZone = $_POST['domain'] . ' 3600 SOA ns1.niver.test. admin.niver.test. 1 21600 7200 3628800 3600
+' . $_POST['domain'] . ' 86400 NS ns1.niver.test.
+';
+if (is_int(file_put_contents($knotZonePath, $knotZone)) !== true)
+	serverError("Failed to write new zone file.");
+if (chmod($knotZonePath, 0660) !== true)
+	serverError("Failed to chmod new zone file.");
+
+exec(CONF['dns']['knotc_path'] . " conf-begin");
+exec(CONF['dns']['knotc_path'] . " conf-set 'zone[" . $_POST['domain'] . "]'");
+exec(CONF['dns']['knotc_path'] . " conf-set 'zone[" . $_POST['domain'] . "].template' 'niver'");
+exec(CONF['dns']['knotc_path'] . " conf-commit");
+
+success("La requête a été traitée.");
diff --git a/public/ns/zone-del.php b/public/ns/zone-del.php
new file mode 100644
index 0000000..0ae5e17
--- /dev/null
+++ b/public/ns/zone-del.php
@@ -0,0 +1,41 @@
+<?php require "../../common/html.php"; ?>
+
+<form method="post">
+	<label for="zone">Zone</label>
+	<select required="" name="zone" id="zone">
+		<option value="" disabled="" selected="">-</option>
+<?php
+if (isset($_SESSION['username']))
+	foreach (nsListUserZones($_SESSION['username']) as $zone)
+		echo "		<option value='" . $zone . "'>" . $zone . "</option>\n";
+?>
+	</select>
+	<br>
+	<input value="Supprimer toutes les données liées à cette zone" type="submit">
+</form>
+
+<?php
+
+switchToFormProcess();
+
+nsCheckZonePossession($_POST['zone']);
+
+// Remove from Knot configuration
+exec(CONF['dns']['knotc_path'] . " conf-begin");
+exec(CONF['dns']['knotc_path'] . " conf-unset 'zone[" . $_POST['zone'] . "]'");
+exec(CONF['dns']['knotc_path'] . " conf-commit");
+
+// Remove Knot zone file
+if(unlink(CONF['ns']['knot_zones_path'] . "/" . $_POST['zone'] . "zone") !== true)
+	serverError("Failed to remove Knot zone file.");
+
+// Remove Knot related data
+exec(CONF['dns']['knotc_path'] . " zone-purge " . $_POST['zone']);
+
+// Remove from database
+query('delete', 'zones', [
+	'zone' => $_POST['zone'],
+	'username' => $_SESSION['username'],
+]);
+
+success("Zone effacée.");
diff --git a/public/ns/zone.php b/public/ns/zone.php
deleted file mode 100644
index 039a308..0000000
--- a/public/ns/zone.php
+++ /dev/null
@@ -1,92 +0,0 @@
-<?php require "../../common/html.php"; ?>
-
-<form method="post">
-	<h2>Ajouter une zone</h2>
-	<label for="domain">Domaine</label><br>
-	<input required="" placeholder="domain.<?= PLACEHOLDER_DOMAIN ?>." id="domain" name="domain" type="text"><br>
-	<input value="Ajouter" type="submit">
-</form>
-
-<?php
-
-if (isset($_POST['domain']) AND isset($_SESSION['username'])) {
-
-	checkAbsoluteDomainFormat($_POST['domain']);
-
-	$db = new PDO('sqlite:' . DB_PATH);
-	$stmt = $db->prepare("INSERT INTO zones(zone, username) VALUES(:zone, :username)");
-
-	$stmt->bindValue(':zone', $_POST['domain']);
-	$stmt->bindValue(':username', $_SESSION['username']);
-
-	$stmt->execute();
-
-	$knotZonePath = CONF['ns']['knot_zones_path'] . "/" . $_POST['domain'] . "zone";
-	$knotZone = $_POST['domain'] . ' 3600 SOA ns1.niver.test. admin.niver.test. 1 21600 7200 3628800 3600
-' . $_POST['domain'] . ' 86400 NS ns1.niver.test.
-';
-	file_put_contents($knotZonePath, $knotZone);
-	chmod($knotZonePath, 0660);
-
-	exec(CONF['dns']['knotc_path'] . " conf-begin");
-	exec(CONF['dns']['knotc_path'] . " conf-set 'zone[" . $_POST['domain'] . "]'");
-	exec(CONF['dns']['knotc_path'] . " conf-set 'zone[" . $_POST['domain'] . "].template' 'niver'");
-	exec(CONF['dns']['knotc_path'] . " conf-commit");
-
-	echo "La requête a été traitée.";
-
-}
-
-?>
-
-<form method="post">
-	<h2>Supprimer une zone</h2>
-	<label for="zone">Zone</label>
-	<select required="" name="zone" id="zone">
-		<option value="" disabled="" selected="">-</option><?php
-		if (isset($_SESSION['username'])) {
-			$zones = nsListUserZones($_SESSION['username']);
-
-			if (!empty($zones)) {
-				foreach ($zones as $zone)
-					echo "<option value='" . $zone . "'>" . $zone . "</option>";
-			}
-		}
-?>
-	</select>
-	<br>
-	<input value="Supprimer toutes les données liées à cette zone" type="submit">
-</form>
-
-<?php
-
-if (isset($_POST['zone']) AND isset($_SESSION['username'])) {
-
-	nsCheckZonePossession($_POST['zone']);
-
-	// Remove from Knot configuration
-	exec(CONF['dns']['knotc_path'] . " conf-begin");
-	exec(CONF['dns']['knotc_path'] . " conf-unset 'zone[" . $_POST['zone'] . "]'");
-	exec(CONF['dns']['knotc_path'] . " conf-commit");
-
-	// Remove Knot zone file
-	unlink(CONF['ns']['knot_zones_path'] . "/" . $_POST['zone'] . "zone");
-
-	// Remove Knot related data
-	exec(CONF['dns']['knotc_path'] . " zone-purge " . $_POST['zone']);
-
-	// Remove from Niver's database
-	$db = new PDO('sqlite:' . DB_PATH);
-	$stmt = $db->prepare("DELETE FROM zones WHERE zone = :zone AND username = :username");
-
-	$stmt->bindValue(':zone', $_POST['zone']);
-	$stmt->bindValue(':username', $_SESSION['username']);
-
-	$stmt->execute();
-
-	echo "La requête a été traitée.";
-}
-
-?>
-
-<?php closeHTML(); ?>