diff --git a/src/commons/component/host-detail.component.html b/src/commons/component/host-detail.component.html
index c22edf4..c4e7221 100644
--- a/src/commons/component/host-detail.component.html
+++ b/src/commons/component/host-detail.component.html
@@ -82,21 +82,21 @@
       <div class="ui-g">
         <div class="ui-ping-row">
           <div class="title">Count </div>
-          <input type="number" pInputText [(ngModel)]="count" min="1" max="50">
+          <p-spinner size="1" [(ngModel)]="count" [min]="1" [max]="30"></p-spinner>
         </div>
         <div class="ui-ping-row">
           <div class="title">Interval </div>
-          <input type="number" pInputText [(ngModel)]="interval" min="1" max="10">
+          <p-spinner size="1" [(ngModel)]="interval" [min]="0" [max]="5"></p-spinner>
         </div>
         <div class="ui-ping-row">
           <div class="title">Deadline </div>
-          <input type="number" pInputText [(ngModel)]="deadline" min="1" max="10">
+          <p-spinner size="1" [(ngModel)]="deadline" [min]="1" [max]="10"></p-spinner>
         </div>
       </div>
       <button type="button" pButton label="Ping" (click)="doPing()" class="ui-button-secondary ui-pingbn-position"></button>
 
       <div class="ui-ping-result-textarea">
-        <p-progressSpinner *ngIf="pingWaiting"></p-progressSpinner>
+        <p-progressBar *ngIf="pingWaiting" mode="indeterminate"></p-progressBar>
         <textarea *ngIf="!pingWaiting && pingResult" pInputTextarea autoResize="autoResize" [(ngModel)]="pingResultRaw"></textarea>
       </div>
 
diff --git a/src/commons/component/host-detail.component.ts b/src/commons/component/host-detail.component.ts
index 5b4b719..83eccaa 100644
--- a/src/commons/component/host-detail.component.ts
+++ b/src/commons/component/host-detail.component.ts
@@ -56,6 +56,7 @@ export class HostDetailComponent implements OnChanges {
           console.log(pingResult);
           if (pingResult) {
             this.pingResult = pingResult;
+            console.log(pingResult.raw);
             this.pingResultRaw = pingResult.raw.join('');
           }
           this.pingWaiting = false;
diff --git a/src/commons/component/scanner-setting-dropdown.component.ts b/src/commons/component/scanner-setting-dropdown.component.ts
index 7a8cb85..c64c423 100644
--- a/src/commons/component/scanner-setting-dropdown.component.ts
+++ b/src/commons/component/scanner-setting-dropdown.component.ts
@@ -33,6 +33,8 @@ export class ScannerSettingDropdownComponent implements OnInit {
   zone: Zone;
   lastCondition: Condition = null;
 
+  validIPArray: string[];
+
   constructor(
     private discoveryConfigService: DiscoveryConfigService
   ) {
@@ -50,13 +52,13 @@ export class ScannerSettingDropdownComponent implements OnInit {
     if (this.zone === null) {
       return;
     }
-    console.log(this.zone);
 
-    const cidr = new IPCIDR(this.zone.network);
+    const cidrUtil = new IPCIDR(this.zone.network);
+    this.validIPArray = cidrUtil.toArray();
     this.ipType = MetaIPTypeEnum.V4;
 
-    this.firstIP = cidr.start();
-    this.lastIP = cidr.end();
+    this.firstIP = cidrUtil.start();
+    this.lastIP = cidrUtil.end();
     this.includePortType = [MetaPortTypeEnum.TCP, MetaPortTypeEnum.UDP];
     this.firstPort = '1';
     this.lastPort = '65535';
@@ -74,6 +76,10 @@ export class ScannerSettingDropdownComponent implements OnInit {
           this.ipErrMsg = 'Invalid IP format.';
           return;
         }
+        if (this.validIPArray.indexOf(value) === -1) {
+          this.ipErrMsg = 'Invalid IP range.';
+          return;
+        }
         const from = idx === 0 ? value : this.firstIP;
         const to = idx === 1 ? value : this.lastIP;
         if (this.ipToNum(from) > this.ipToNum(to)) {
diff --git a/src/commons/component/service-detail.component.html b/src/commons/component/service-detail.component.html
index 665fc11..40a1f64 100644
--- a/src/commons/component/service-detail.component.html
+++ b/src/commons/component/service-detail.component.html
@@ -65,21 +65,22 @@
       <div class="ui-g">
         <div class="ui-ping-row">
           <div class="title">Count </div>
-          <input type="number" pInputText [(ngModel)]="count" min="1" max="50">
+          <p-spinner size="1" [(ngModel)]="count" [min]="1" [max]="30"></p-spinner>
         </div>
         <div class="ui-ping-row">
           <div class="title">Interval </div>
-          <input type="number" pInputText [(ngModel)]="interval" min="1" max="10">
+          <p-spinner size="1" [(ngModel)]="interval" [min]="0" [max]="5"></p-spinner>
         </div>
         <div class="ui-ping-row">
           <div class="title">Deadline </div>
-          <input type="number" pInputText [(ngModel)]="deadline" min="1" max="10">
+          <p-spinner size="1" [(ngModel)]="deadline" [min]="1" [max]="10"></p-spinner>
         </div>
       </div>
       <button type="button" pButton label="Ping" (click)="doPing()" class="ui-button-secondary ui-pingbn-position"></button>
       <div class="ui-ping-result">
-        <p-progressSpinner *ngIf="pingWaiting"></p-progressSpinner>
-        <p-table [value]="pingResult.responses | objectKeys" *ngIf="!pingWaiting && pingResult">
+        <p-progressBar *ngIf="pingWaiting" mode="indeterminate"></p-progressBar>
+        <p-table [value]="pingResult.responses | objectKeys" *ngIf="!pingWaiting && pingResult" [scrollable]="true"
+          scrollHeight="200px">
           <ng-template pTemplate="header">
             <tr>
               <th style="width: 3.25em">No.</th>
@@ -88,7 +89,7 @@
           </ng-template>
           <ng-template pTemplate="body" let-key let-i="rowIndex">
             <tr>
-              <td>
+              <td style="width: 3.25em">
                 {{i + 1}}
               </td>
               <td>
diff --git a/src/commons/component/zone-detail.component.html b/src/commons/component/zone-detail.component.html
index e310422..e762e30 100644
--- a/src/commons/component/zone-detail.component.html
+++ b/src/commons/component/zone-detail.component.html
@@ -44,16 +44,36 @@
     </p-tabPanel>
 
     <p-tabPanel header="Hosts">
-      <perfect-scrollbar>
-        <ul class="key-value">
-          <li *ngFor="let host of zone.hostList | ipSort: 'address'">
-            <a href="javascript:void(0)" (click)="hostSelected(host)" style="text-decoration:none">
-              <span class="meta-value">{{host.address}}</span> <span *ngIf="host.name" class="meta-value">
-                ({{host.name}})</span>
-            </a>
-          </li>
-        </ul>
-      </perfect-scrollbar>
+      <div>
+        <perfect-scrollbar>
+          <ul class="key-value">
+            <li *ngFor="let host of zone.hostList | ipSort: 'address'">
+              <a href="javascript:void(0)" (click)="hostSelected(host)" style="text-decoration:none">
+                <span class="meta-value">{{host.address}}</span> <span *ngIf="host.name" class="meta-value">
+                  ({{host.name}})</span>
+              </a>
+            </li>
+            <li *ngFor="let host of zone.hostList | ipSort: 'address'">
+              <a href="javascript:void(0)" (click)="hostSelected(host)" style="text-decoration:none">
+                <span class="meta-value">{{host.address}}</span> <span *ngIf="host.name" class="meta-value">
+                  ({{host.name}})</span>
+              </a>
+            </li>
+            <li *ngFor="let host of zone.hostList | ipSort: 'address'">
+              <a href="javascript:void(0)" (click)="hostSelected(host)" style="text-decoration:none">
+                <span class="meta-value">{{host.address}}</span> <span *ngIf="host.name" class="meta-value">
+                  ({{host.name}})</span>
+              </a>
+            </li>
+            <li *ngFor="let host of zone.hostList | ipSort: 'address'">
+              <a href="javascript:void(0)" (click)="hostSelected(host)" style="text-decoration:none">
+                <span class="meta-value">{{host.address}}</span> <span *ngIf="host.name" class="meta-value">
+                  ({{host.name}})</span>
+              </a>
+            </li>
+          </ul>
+        </perfect-scrollbar>
+      </div>
     </p-tabPanel>
 
   </p-tabView>