diff --git a/internal/pihole/client.go b/internal/pihole/client.go
index df0a4ac..72cb517 100644
--- a/internal/pihole/client.go
+++ b/internal/pihole/client.go
@@ -71,7 +71,11 @@ func New(rawURL string, insecureTLS bool) (*Client, error) {
 }
 
 func normalizeBaseURL(raw string) (string, error) {
-	parsed, err := url.Parse(strings.TrimSpace(raw))
+	raw = strings.TrimSpace(raw)
+	if address := net.ParseIP(raw); address != nil && address.To4() != nil {
+		raw = "http://" + raw
+	}
+	parsed, err := url.Parse(raw)
 	if err != nil || parsed.Host == "" || (parsed.Scheme != "http" && parsed.Scheme != "https") {
 		return "", errors.New("Pi-hole-Adresse muss eine vollständige HTTP- oder HTTPS-URL sein")
 	}
diff --git a/internal/pihole/client_test.go b/internal/pihole/client_test.go
index 479b02f..62a3daf 100644
--- a/internal/pihole/client_test.go
+++ b/internal/pihole/client_test.go
@@ -101,6 +101,10 @@ func TestNewValidatesAndNormalizesPiHoleURL(t *testing.T) {
 	if err != nil || client.BaseURL() != "http://pihole.local/custom/api" {
 		t.Fatalf("custom path not normalized: %q err=%v", client.BaseURL(), err)
 	}
+	client, err = New("10.0.20.100", false)
+	if err != nil || client.BaseURL() != "http://10.0.20.100/api" {
+		t.Fatalf("bare IPv4 address not normalized: %q err=%v", client.BaseURL(), err)
+	}
 	for _, invalid := range []string{"pi.hole", "ftp://pi.hole", "https://user:pass@pi.hole", "https://pi.hole?sid=secret"} {
 		if _, err := New(invalid, false); err == nil {
 			t.Errorf("invalid URL accepted: %s", invalid)
diff --git a/internal/web/server_test.go b/internal/web/server_test.go
index 0f917d9..0aca317 100644
--- a/internal/web/server_test.go
+++ b/internal/web/server_test.go
@@ -317,7 +317,7 @@ func TestPiHolePageRendersConnectionAndLocalDNSControls(t *testing.T) {
 		t.Fatalf("render Pi-hole page: %v", err)
 	}
 	body := rendered.String()
-	for _, expected := range []string{`href="/pihole"`, `aria-current="page"`, `action="/pihole/7/records"`, `action="/pihole/7/records/update"`, `action="/pihole/7/records/archive"`, `action="/pihole/7/records/restore"`, `action="/pihole/7/records/delete"`, `action="/pihole/7/remove"`, `action="/pihole/7/delete"`, `action="/pihole/7/save"`, `action="/pihole/7/password"`, `name="active"`, `name="link_id" value="11"`, `name="insecure_tls"`, `data-dirty-form`, `data-dirty-submit disabled aria-disabled="true"`, `data-scroll-page-end`, `Anwendungspasswort anzeigen`, `Passwort entschlüsseln`, `Nur aus der WebUI entfernen`, `Anwendungspasswort`, `nas.lan`, `old.lan`, `192.168.1.20`} {
+	for _, expected := range []string{`href="/pihole"`, `aria-current="page"`, `action="/pihole/7/records"`, `action="/pihole/7/records/update"`, `action="/pihole/7/records/archive"`, `action="/pihole/7/records/restore"`, `action="/pihole/7/records/delete"`, `action="/pihole/7/remove"`, `action="/pihole/7/delete"`, `action="/pihole/7/save"`, `action="/pihole/7/password"`, `name="active"`, `name="link_id" value="11"`, `name="insecure_tls"`, `name="base_url" type="text"`, `data-dirty-form`, `data-dirty-submit disabled aria-disabled="true"`, `data-scroll-page-end`, `Anwendungspasswort anzeigen`, `Passwort entschlüsseln`, `Nur aus der WebUI entfernen`, `Anwendungspasswort`, `nas.lan`, `old.lan`, `192.168.1.20`} {
 		if !strings.Contains(body, expected) {
 			t.Errorf("Pi-hole page is missing %q", expected)
 		}
@@ -359,7 +359,7 @@ func TestPiHoleDisconnectedPageCentersConnectFormWithoutEmptyState(t *testing.T)
 		t.Fatalf("render disconnected Pi-hole page: %v", err)
 	}
 	body := rendered.String()
-	for _, expected := range []string{`class="pihole-connect-stage"`, `class="form-panel pihole-connect-panel"`, `action="/pihole/connect"`} {
+	for _, expected := range []string{`class="pihole-connect-stage"`, `class="form-panel pihole-connect-panel"`, `action="/pihole/connect"`, `name="base_url" type="text"`, `10.0.20.100 oder https://pi.hole`} {
 		if !strings.Contains(body, expected) {
 			t.Errorf("disconnected Pi-hole page is missing %q", expected)
 		}
diff --git a/internal/web/templates/layout.html b/internal/web/templates/layout.html
index 4769f31..d792729 100644
--- a/internal/web/templates/layout.html
+++ b/internal/web/templates/layout.html
@@ -6,8 +6,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="color-scheme" content="light">
   <title>{{.Title}} · DNS Control</title>
-  <link rel="stylesheet" href="/static/styles.css?v=features-14">
-  <script src="/static/app.js?v=features-14" defer></script>
+  <link rel="stylesheet" href="/static/styles.css?v=features-15">
+  <script src="/static/app.js?v=features-15" defer></script>
 </head>
 <body class="page-{{.Page}}">
   <a class="skip-link" href="#main">Zum Inhalt springen</a>
diff --git a/internal/web/templates/pihole.html b/internal/web/templates/pihole.html
index 640d350..655d384 100644
--- a/internal/web/templates/pihole.html
+++ b/internal/web/templates/pihole.html
@@ -69,7 +69,7 @@
   </article>
   <article class="panel" id="pihole-connection"><div class="panel-heading"><div><span class="section-label pihole-kicker">API-Zugang</span><h2>Verbindung verwalten</h2></div><span class="status-pill {{if $view.FetchError}}status-bad{{else}}pihole-status-pill{{end}}">{{if $view.FetchError}}Nicht erreichbar{{else}}Verbunden{{end}}</span></div>
     <p class="panel-description">Das Anwendungspasswort bleibt verschlüsselt und standardmäßig verborgen. Eine Anzeige erfordert erneut dein Admin-Passwort.</p>
-    <form action="/pihole/{{$integration.ID}}/save" method="post" class="stacked-form" data-dirty-form><input type="hidden" name="csrf" value="{{.CSRF}}"><label>Pi-hole-Adresse <input name="base_url" type="url" value="{{$integration.BaseURL}}" required><small>Basis-URL oder vollständiger <code>/api</code>-Pfad.</small></label><label>Neues Anwendungspasswort <input name="password" type="password" autocomplete="new-password"><small>Leer lassen, um das gespeicherte Passwort beizubehalten.</small></label><label class="switch pihole-switch"><input type="checkbox" name="insecure_tls" {{if $integration.InsecureTLS}}checked{{end}}><span></span> TLS-Zertifikat nicht prüfen</label><button class="button button-pihole" type="submit" data-dirty-submit disabled aria-disabled="true">Verbindung prüfen und speichern</button></form>
+    <form action="/pihole/{{$integration.ID}}/save" method="post" class="stacked-form" data-dirty-form><input type="hidden" name="csrf" value="{{.CSRF}}"><label>Pi-hole-Adresse <input name="base_url" type="text" inputmode="url" autocapitalize="none" spellcheck="false" value="{{$integration.BaseURL}}" required><small>IPv4-Adresse oder Basis-URL; <code>/api</code> wird automatisch ergänzt.</small></label><label>Neues Anwendungspasswort <input name="password" type="password" autocomplete="new-password"><small>Leer lassen, um das gespeicherte Passwort beizubehalten.</small></label><label class="switch pihole-switch"><input type="checkbox" name="insecure_tls" {{if $integration.InsecureTLS}}checked{{end}}><span></span> TLS-Zertifikat nicht prüfen</label><button class="button button-pihole" type="submit" data-dirty-submit disabled aria-disabled="true">Verbindung prüfen und speichern</button></form>
     <div class="panel-divider"></div>
     <details><summary class="button button-quiet">Anwendungspasswort anzeigen</summary><form action="/pihole/{{$integration.ID}}/password" method="post" class="stacked-form inset-form"><input type="hidden" name="csrf" value="{{$.CSRF}}"><label>Admin-Passwort <input type="password" name="password" autocomplete="current-password" required></label><button class="button button-danger-soft" type="submit">Passwort entschlüsseln</button></form></details>
     <div class="panel-divider"></div>
@@ -82,7 +82,7 @@
   <div class="form-panel pihole-connect-panel" id="pihole-connect">
     <div class="panel-heading"><div><span class="section-label pihole-kicker">API-Verbindung</span><h2 id="pihole-connect-title">Pi-hole verbinden</h2></div><span class="pihole-api-badge">API v6</span></div>
     <p class="panel-description">Verwende ein eigenes Pi-hole-Anwendungspasswort. Es wird mit dem Master-Key dieser Anwendung verschlüsselt.</p>
-    <form action="/pihole/connect" method="post" class="stacked-form"><input type="hidden" name="csrf" value="{{.CSRF}}"><label>Pi-hole-Adresse <input name="base_url" type="url" placeholder="https://pi.hole" required><small><code>/api</code> wird automatisch ergänzt.</small></label><label>Anwendungspasswort <input name="password" type="password" autocomplete="new-password" required><small>Keinen Session-Token eintragen.</small></label><label class="switch pihole-switch"><input type="checkbox" name="insecure_tls"><span></span> TLS-Zertifikat nicht prüfen</label><div class="warning-box">Nur für ein selbstsigniertes Zertifikat in einem vertrauenswürdigen internen Netz verwenden. Bei HTTP wird das Passwort auf dem Netzwerkweg unverschlüsselt übertragen.</div><button class="button button-pihole" type="submit">Verbindung testen und speichern</button></form>
+    <form action="/pihole/connect" method="post" class="stacked-form"><input type="hidden" name="csrf" value="{{.CSRF}}"><label>Pi-hole-Adresse <input name="base_url" type="text" inputmode="url" autocapitalize="none" spellcheck="false" placeholder="10.0.20.100 oder https://pi.hole" required><small>IPv4-Adressen werden automatisch über HTTP verbunden; <code>/api</code> wird ergänzt.</small></label><label>Anwendungspasswort <input name="password" type="password" autocomplete="new-password" required><small>Keinen Session-Token eintragen.</small></label><label class="switch pihole-switch"><input type="checkbox" name="insecure_tls"><span></span> TLS-Zertifikat nicht prüfen</label><div class="warning-box">Nur für ein selbstsigniertes Zertifikat in einem vertrauenswürdigen internen Netz verwenden. Bei HTTP wird das Passwort auf dem Netzwerkweg unverschlüsselt übertragen.</div><button class="button button-pihole" type="submit">Verbindung testen und speichern</button></form>
   </div>
 </section>
 {{end}}