Index: /trunk/src/VBox/Frontends/VirtualBox/src/hostnetwork/UIHostNetworkManager.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/hostnetwork/UIHostNetworkManager.cpp	(revision 66720)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/hostnetwork/UIHostNetworkManager.cpp	(revision 66721)
@@ -86,7 +86,8 @@
     /* Compose item fields: */
     setText(Column_Name, m_interface.m_strName);
-    setText(Column_IPv4, QString("%1/%2").arg(m_interface.m_strAddress).arg(maskToCidr(m_interface.m_strMask)));
-    setText(Column_IPv6, !m_interface.m_fSupportedIPv6 ? QString() :
-                         QString("%1/%2").arg(m_interface.m_strAddress6).arg(maskToCidr(m_interface.m_strMaskLength6)));
+    setText(Column_IPv4, m_interface.m_strAddress.isEmpty() ? QString() :
+                         QString("%1/%2").arg(m_interface.m_strAddress).arg(maskToCidr(m_interface.m_strMask)));
+    setText(Column_IPv6, m_interface.m_strAddress6.isEmpty() || !m_interface.m_fSupportedIPv6 ? QString() :
+                         QString("%1/%2").arg(m_interface.m_strAddress6).arg(m_interface.m_strMaskLength6.toInt()));
     setText(Column_DHCP, UIHostNetworkManager::tr("Enable", "DHCP Server"));
     setCheckState(Column_DHCP, m_dhcpserver.m_fEnabled ? Qt::Checked : Qt::Unchecked);