diff --git a/server/server.go b/server/server.go
index 424d548..13e9c82 100755
--- a/server/server.go
+++ b/server/server.go
@@ -201,7 +201,22 @@ func pushMeta(r *http.Request, k, v string) {
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	s.Pre(s.Proxy)(w, r)
+	foo := s.Proxy
+	if strings.Split(r.Host, ".")[0] == "_" {
+		keys := s.db.Keys(nsRouting)
+		hostURL := map[string]string{}
+		for _, key := range keys {
+			u, _ := s.lookup(key)
+			if u != nil {
+				hostURL[key] = u.String()
+			}
+		}
+		json.NewEncoder(w).Encode(map[string]any{
+			"hostsToURLs": hostURL,
+		})
+		return
+	}
+	s.Pre(foo)(w, r)
 }
 
 type corsResponseWriter struct {
diff --git a/storage/db.go b/storage/db.go
index 20c0140..8481217 100755
--- a/storage/db.go
+++ b/storage/db.go
@@ -2,6 +2,7 @@ package storage
 
 import (
 	"errors"
+
 	"gitea.inhome.blapointe.com/local/rproxy3/storage/packable"
 )
 
@@ -10,5 +11,6 @@ var ErrNotFound = errors.New("not found")
 type DB interface {
 	Get(string, string, packable.Packable) error
 	Set(string, string, packable.Packable) error
+	Keys(string) []string
 	Close() error
 }
diff --git a/storage/map.go b/storage/map.go
index bf78cc5..f2fa458 100755
--- a/storage/map.go
+++ b/storage/map.go
@@ -2,6 +2,7 @@ package storage
 
 import (
 	"fmt"
+
 	"gitea.inhome.blapointe.com/local/rproxy3/storage/packable"
 )
 
@@ -40,6 +41,15 @@ func (m Map) Close() error {
 	return nil
 }
 
+func (m Map) Keys(ns string) []string {
+	m2, _ := m[ns]
+	result := make([]string, 0, len(m2))
+	for k := range m2 {
+		result = append(result, k)
+	}
+	return result
+}
+
 func (m Map) Get(ns, key string, value packable.Packable) error {
 	if _, ok := m[ns]; !ok {
 		m[ns] = make(map[string][]byte)