diff --git a/app/Http/Controllers/SystemController.php b/app/Http/Controllers/SystemController.php
index da4b812..20eb0da 100644
--- a/app/Http/Controllers/SystemController.php
+++ b/app/Http/Controllers/SystemController.php
@@ -200,9 +200,10 @@ class SystemController extends Controller
 				'mailer_address' => 'nullable|regex:/^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){1,127}(?![0-9]*$)[a-z0-9-]+\.?)$/i',
 				'mailer_port' => 'nullable|digits_between:2,5',
 				'active' => 'required|boolean',
+				'zt_id' => 'nullable|size:10|regex:/^([A-Fa-f0-9]){10}$/|unique:systems,zt_id,'.($o->exists ? $o->id : 0),
 			]);
 
-			foreach (['name','location','sysop','address','port','active','method','notes','mailer_type','mailer_address','mailer_port'] as $key)
+			foreach (['name','location','sysop','address','port','active','method','notes','mailer_type','mailer_address','mailer_port','zt_id'] as $key)
 				$o->{$key} = $request->post($key);
 
 			$o->save();
diff --git a/app/Http/Controllers/ZoneController.php b/app/Http/Controllers/ZoneController.php
index 68f83d6..667b348 100644
--- a/app/Http/Controllers/ZoneController.php
+++ b/app/Http/Controllers/ZoneController.php
@@ -35,11 +35,27 @@ class ZoneController extends Controller
 					})
 				],
 				'system_id' => 'required|exists:systems,id',
-				'zt_id' => 'nullable|size:10|regex:/^([A-Fa-f0-9]){10}$/',
+				'zt_id' => 'nullable|size:16|regex:/^([A-Fa-f0-9]){16}$/|unique:zones,zt_id,'.($o->exists ? $o->id : 0),
 				'zt_ipv4' => 'nullable|ipv4',
-				'zt_ipv4_mask' => 'nullable|numeric|lte:31',
+				'zt_ipv4_mask' => [
+					'nullable','numeric','lte:31','required_with:zt_ipv4',
+					Rule::unique('zones')->where(function ($query) use ($request,$o) {
+						return $query->where('zt_ipv4',$request->post('zt_ipv4'))
+							->where('zt_ipv4_mask',$request->post('zt_ipv4_mask'))
+							->when($o->exists,function($query) use ($o) {
+								return $query->where('id','<>',$o->id);
+							});
+					})],
 				'zt_ipv6' => 'nullable|ipv6',
-				'zt_ipv6_mask' => 'nullable|numeric|lte:112',
+				'zt_ipv6_mask' => [
+					'nullable','numeric','lte:112','required_with:zt_ipv6',
+					Rule::unique('zones')->where(function ($query) use ($request,$o) {
+						return $query->where('zt_ipv6',$request->post('zt_ipv6'))
+							->where('zt_ipv6_mask',$request->post('zt_ipv6_mask'))
+							->when($o->exists,function($query) use ($o) {
+								return $query->where('id','<>',$o->id);
+							});
+					})],
 				'active' => 'required|boolean',
 			]);
 
diff --git a/resources/views/system/addedit.blade.php b/resources/views/system/addedit.blade.php
index abfcaa4..1f77bfa 100644
--- a/resources/views/system/addedit.blade.php
+++ b/resources/views/system/addedit.blade.php
@@ -60,8 +60,17 @@
 												</div>
 											</div>
 
-											<div class="col-2">
-												ZeroTier ID
+											<div class="col-3">
+												<label for="zt_id" class="form-label">ZeroTier ID</label>
+												<div class="input-group has-validation">
+													<span class="input-group-text"><i class="bi bi-shield-lock-fill"></i></span>
+													<input type="text" class="form-control @error('zt_id') is-invalid @enderror" id="zt_id" placeholder="ZeroTier" name="zt_id" value="{{ old('zt_id',$o->zt_id) }}" @cannot('admin',$o)disabled @endcannot>
+													<span class="invalid-feedback" role="alert">
+														@error('zt_id')
+															{{ $message }}
+														@enderror
+													</span>
+												</div>
 											</div>
 										</div>
 
diff --git a/resources/views/zone/addedit.blade.php b/resources/views/zone/addedit.blade.php
index b2291a4..8f4833b 100644
--- a/resources/views/zone/addedit.blade.php
+++ b/resources/views/zone/addedit.blade.php
@@ -86,7 +86,7 @@
 					</div>
 
 					<div class="row">
-						<div class="col-2">
+						<div class="col-3">
 							<label for="zt_id" class="form-label">ZeroTier Network ID</label>
 							<div class="input-group has-validation">
 								<span class="input-group-text"><i class="bi bi-shield-lock-fill"></i></span>
@@ -117,11 +117,11 @@
 							</div>
 						</div>
 
-						<div class="col-6">
+						<div class="col-5">
 							<label for="zt_ipv6" class="form-label">ZeroTier IPv6 Network</label>
 							<div class="input-group has-validation">
 								<span class="input-group-text"><i class="bi bi-broadcast-pin"></i></span>
-								<input type="text" style="width: 65%;" class="form-control @error('zt_ipv6') is-invalid @enderror" id="zt_ipv6" placeholder="fd00:f1d0:0000:0000:0000:0000:0000:0000" name="zt_ipv6" value="{{ old('zt_ipv6',$o->zt_ipv6) }}" @cannot('admin',$o)disabled @endcannot>
+								<input type="text" style="width: 60%;" class="form-control @error('zt_ipv6') is-invalid @enderror" id="zt_ipv6" placeholder="fd00:f1d0:0000:0000:0000:0000:0000:0000" name="zt_ipv6" value="{{ old('zt_ipv6',$o->zt_ipv6) }}" @cannot('admin',$o)disabled @endcannot>
 								<span class="input-group-text">/</span>
 								<input type="text" class="form-control @error('zt_ipv6_mask') is-invalid @enderror" id="zt_ipv6_mask" placeholder="112" name="zt_ipv6_mask" value="{{ old('zt_ipv6_mask',$o->zt_ipv6_mask) }}" @cannot('admin',$o)disabled @endcannot>
 								<span class="invalid-feedback" role="alert">