diff --git a/server/routes.go b/server/routes.go
index 1e7a464..2f0805b 100644
--- a/server/routes.go
+++ b/server/routes.go
@@ -131,6 +131,8 @@ func (r *routesImpl) FindBackendForServerAddress(serverAddress string) string {
 
 	addressParts := strings.Split(serverAddress, "\x00")
 
+	address := strings.toLower(addressParts[0])
+
 	if r.mappings == nil {
 		return r.defaultRoute
 	} else {
@@ -171,6 +173,8 @@ func (r *routesImpl) CreateMapping(serverAddress string, backend string) {
 	r.Lock()
 	defer r.Unlock()
 
+	serverAddress = strings.toLower(serverAddress)
+
 	logrus.WithFields(logrus.Fields{
 		"serverAddress": serverAddress,
 		"backend":       backend,