diff --git a/EduNetworkBuilder/NBRenumberData.cs b/EduNetworkBuilder/NBRenumberData.cs
new file mode 100644
index 0000000..d048d67
--- /dev/null
+++ b/EduNetworkBuilder/NBRenumberData.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EduNetworkBuilder
+{
+    public class NBRenumberData
+    {
+        public string Hostname = "";
+        public NetworkDevice Device {
+            get {
+                Network myNet = NB.GetNetwork();
+                if (myNet == null) return null;
+                return myNet.DeviceFromName(Hostname);
+            }
+        }
+        public int ActiveCount=0;
+        public string nicname;
+        public string SuggestedIP;
+        
+        private bool _isRouter = false;
+        /// <summary>
+        /// Return true if the Device specified by hostname does routing.
+        /// </summary>
+        public bool IsRouter {
+            get {
+                if (_isRouter) return true;
+                NetworkDevice ND = Device;
+                if(ND.RoutesPackets())
+                {
+                    _isRouter = true;
+                    return true;
+                }
+                return false;
+            }
+        }
+    }
+}