diff --git a/plinth/modules/firewall/__init__.py b/plinth/modules/firewall/__init__.py
index 9f64467d7..7eabc6c79 100644
--- a/plinth/modules/firewall/__init__.py
+++ b/plinth/modules/firewall/__init__.py
@@ -50,6 +50,8 @@ manual_page = 'Firewall'
 
 LOGGER = logging.getLogger(__name__)
 
+_port_details = {}
+
 
 def init():
     """Initailze firewall module"""
@@ -97,9 +99,13 @@ def get_enabled_services(zone):
 
 def get_port_details(service_port):
     """Return the port types and numbers for a service port"""
-    output = _run(
-        ['get-service-ports', '--service', service_port], superuser=True)
-    return output.split()
+    try:
+        return _port_details[service_port]
+    except KeyError:
+        output = _run(['get-service-ports', '--service', service_port],
+                      superuser=True)
+        _port_details[service_port] = output.strip()
+        return _port_details[service_port]
 
 
 def get_interfaces(zone):
diff --git a/plinth/modules/firewall/templates/firewall.html b/plinth/modules/firewall/templates/firewall.html
index 24bf2ad28..7d0d9abe8 100644
--- a/plinth/modules/firewall/templates/firewall.html
+++ b/plinth/modules/firewall/templates/firewall.html
@@ -67,19 +67,19 @@
                 {% endif %}
               </td>
             </tr>
-            {% for port in service.ports %}
+            {% for port in service.ports_details %}
               <tr class="collapse out {{service.service_id}}"
                   style="background-color: #f9f9f9" >
                 <td></td>
-                <td class='cell-indented'><em>{{ port }}</em></td>
+                <td class='cell-indented'><em>{{ port.name }}</em> ({{ port.details }})</td>
                 <td>
-                  {% if port in internal_enabled_services and port in external_enabled_services %}
+                  {% if port.name in internal_enabled_services and port.name in external_enabled_services %}
                     <span class='label label-success'>
                       {% trans "Permitted" %}</span>
-                  {% elif port in internal_enabled_services %}
+                  {% elif port.name in internal_enabled_services %}
                     <span class='label label-warning'>
                       {% trans "Permitted (internal only)" %}</span>
-                  {% elif port in external_enabled_services %}
+                  {% elif port.name in external_enabled_services %}
                     <span class='label label-warning'>
                       {% trans "Permitted (external only)" %}</span>
                   {% else %}
diff --git a/plinth/service.py b/plinth/service.py
index 3d4f0e25e..3bd3cf82f 100644
--- a/plinth/service.py
+++ b/plinth/service.py
@@ -14,7 +14,6 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-
 """
 Framework for working with servers and their services.
 """
@@ -44,6 +43,7 @@ class Service():
     - disable (optional): method
     - is_running (optional): Boolean or a method returning Boolean
     """
+
     def __init__(self, service_id, name, ports=None, is_external=False,
                  is_enabled=None, enable=None, disable=None, is_running=None):
         if ports is None:
@@ -65,6 +65,19 @@ class Service():
         assert service_id not in services
         services[service_id] = self
 
+    @property
+    def ports_details(self):
+        """Retrieve details of ports associated with service."""
+        from plinth.modules import firewall
+        ports_details = []
+        for port in self.ports:
+            ports_details.append({
+                'name': port,
+                'details': firewall.get_port_details(port),
+            })
+
+        return ports_details
+
     def enable(self):
         if self._enable is None:
             actions.superuser_run('service', ['enable', self.service_id])
@@ -126,6 +139,8 @@ def init():
             is_enabled=True)
     Service('https', _('Web Server over Secure Socket Layer'), ports=['https'],
             is_external=True, is_enabled=True)
-    Service('plinth', format_lazy(_('{box_name} Web Interface (Plinth)'),
-                                  box_name=_(cfg.box_name)),
-            ports=['https'], is_external=True, is_enabled=True)
+    Service(
+        'plinth',
+        format_lazy(
+            _('{box_name} Web Interface (Plinth)'), box_name=_(cfg.box_name)),
+        ports=['https'], is_external=True, is_enabled=True)