diff --git a/core/webserver/handlers.go b/core/webserver/handlers.go
index ebc5d1e4..54f24aaf 100644
--- a/core/webserver/handlers.go
+++ b/core/webserver/handlers.go
@@ -69,7 +69,7 @@ func (s *Server) handleOutput(w http.ResponseWriter, r *http.Request) {
 	default:
 		s.handleJSON(w, c.Config)
 	case "eventgroups":
-		s.handleJSON(w, c.Events.Groups())
+		s.handleJSON(w, c.Events.Groups(val))
 	case "events":
 		switch events, ok := c.Events[val]; {
 		case val == "":
@@ -105,7 +105,7 @@ func (s *Server) handleInput(w http.ResponseWriter, r *http.Request) {
 	default:
 		s.handleJSON(w, c.Config)
 	case "eventgroups":
-		s.handleJSON(w, c.Events.Groups())
+		s.handleJSON(w, c.Events.Groups(val))
 	case "events":
 		switch events, ok := c.Events[val]; {
 		case val == "":
@@ -118,9 +118,9 @@ func (s *Server) handleInput(w http.ResponseWriter, r *http.Request) {
 	case "sites":
 		s.handleJSON(w, c.Sites)
 	case "devices":
-		s.handleJSON(w, c.Devices)
+		s.handleJSON(w, c.Devices.Filter(val))
 	case "clients":
-		s.handleJSON(w, c.Clients)
+		s.handleJSON(w, c.Clients.Filter(val))
 	case "counters":
 		if val != "" {
 			s.handleJSON(w, map[string]int64{val: c.Counter[val]})
diff --git a/core/webserver/plugins_types.go b/core/webserver/plugins_types.go
index 49236c4b..a3f055c9 100644
--- a/core/webserver/plugins_types.go
+++ b/core/webserver/plugins_types.go
@@ -1,6 +1,7 @@
 package webserver
 
 import (
+	"strings"
 	"sync"
 	"time"
 )
@@ -64,9 +65,11 @@ type Event struct {
 	Tags map[string]string `json:"tags,omitempty"`
 }
 
-func (e Events) Groups() (groups []string) {
+func (e Events) Groups(filter string) (groups []string) {
 	for n := range e {
-		groups = append(groups, n)
+		if filter == "" || strings.HasPrefix(n, filter) {
+			groups = append(groups, n)
+		}
 	}
 
 	return groups
@@ -105,6 +108,16 @@ type Device struct {
 	Config     interface{} `json:"config,omitempty"`
 }
 
+func (c Devices) Filter(siteid string) (devices []*Device) {
+	for _, n := range c {
+		if siteid == "" || n.SiteID == siteid {
+			devices = append(devices, n)
+		}
+	}
+
+	return devices
+}
+
 // Clients is a list of clients with their data.
 type Clients []*Client
 
@@ -123,3 +136,13 @@ type Client struct {
 	Since      time.Time `json:"since"`
 	Last       time.Time `json:"last"`
 }
+
+func (c Clients) Filter(siteid string) (clients []*Client) {
+	for _, n := range c {
+		if siteid == "" || n.SiteID == siteid {
+			clients = append(clients, n)
+		}
+	}
+
+	return clients
+}