diff --git a/bridge/net/config.go b/bridge/net/config.go
index 0fda6f54..76e91177 100644
--- a/bridge/net/config.go
+++ b/bridge/net/config.go
@@ -75,13 +75,10 @@ func validateExternalAddress(addr string) (externalAddressPort, error) {
 	if host == "" {
 		return externalAddressPort{}, fmt.Errorf("invalid externalAddress: host cannot be empty")
 	}
-	port, err := strconv.ParseUint(portStr, 10, 16)
+	_, err = strconv.ParseUint(portStr, 10, 16)
 	if err != nil {
 		return externalAddressPort{}, fmt.Errorf("invalid externalAddress: %w", err)
 	}
-	if port == 0 {
-		return externalAddressPort{}, fmt.Errorf("invalid externalAddress: port cannot be 0")
-	}
 
 	_, errIpv4 := gonet.ResolveUDPAddr(UDP4, addr)
 	_, errIpv6 := gonet.ResolveUDPAddr(UDP6, addr)
diff --git a/bridge/net/config_internal_test.go b/bridge/net/config_internal_test.go
index 9a321777..50812fec 100644
--- a/bridge/net/config_internal_test.go
+++ b/bridge/net/config_internal_test.go
@@ -105,11 +105,6 @@ func TestConfigValidate(t *testing.T) {
 			config:  &Config{ExternalAddresses: []string{":12345"}},
 			wantErr: true,
 		},
-		{
-			name:    "ZeroPortInExternalAddress",
-			config:  &Config{ExternalAddresses: []string{"localhost:0"}},
-			wantErr: true,
-		},
 		{
 			name:    "InvalidPortInExternalAddress",
 			config:  &Config{ExternalAddresses: []string{"localhost:invalid"}},
diff --git a/bridge/net/network.go b/bridge/net/network.go
index 542a4e59..2e19e16f 100644
--- a/bridge/net/network.go
+++ b/bridge/net/network.go
@@ -242,11 +242,24 @@ func (s coAPServers) Close() error {
 	return errors.ErrorOrNil()
 }
 
-func newServers(cfg Config, m *mux.Router) (coAPServers, bool, bool, error) {
+func getPortFromAddress(addr gonet.Addr) (string, error) {
+	udpAddr, ok := addr.(*gonet.UDPAddr)
+	if ok {
+		return fmt.Sprintf("%d", udpAddr.Port), nil
+	}
+	addrStr := addr.String()
+	_, port, err := gonet.SplitHostPort(addrStr)
+	if err != nil {
+		return "", err
+	}
+	return port, nil
+}
+
+func newServers(cfg *Config, m *mux.Router) (coAPServers, bool, bool, error) {
 	servers := make(coAPServers, 0, len(cfg.externalAddressesPort))
 	hasIPv4 := false
 	hasIPv6 := false
-	for _, addr := range cfg.externalAddressesPort {
+	for i, addr := range cfg.externalAddressesPort {
 		var conn *net.UDPConn
 		var err error
 		if addr.network == UDP4 {
@@ -261,6 +274,15 @@ func newServers(cfg Config, m *mux.Router) (coAPServers, bool, bool, error) {
 			_ = servers.Close()
 			return nil, false, false, err
 		}
+		if addr.port == "0" {
+			port, err := getPortFromAddress(conn.LocalAddr())
+			if err != nil {
+				_ = servers.Close()
+				return nil, false, false, err
+			}
+			cfg.externalAddressesPort[i].port = port
+		}
+
 		if conn != nil {
 			servers = append(servers, coAPServer{
 				s: udp.NewServer(
@@ -304,7 +326,7 @@ func New(cfg Config, handler RequestHandler) (*Net, error) {
 		return nil, err
 	}
 	m := mux.NewRouter()
-	servers, hasIPv4, hasIPv6, err := newServers(cfg, m)
+	servers, hasIPv4, hasIPv6, err := newServers(&cfg, m)
 	if err != nil {
 		return nil, err
 	}
diff --git a/bridge/test/test.go b/bridge/test/test.go
index 5131dac0..491495b4 100644
--- a/bridge/test/test.go
+++ b/bridge/test/test.go
@@ -29,8 +29,8 @@ import (
 
 const (
 	BRIDGE_SERVICE_PIID     = "f47ac10b-58cc-4372-a567-0e02b2c3d479"
-	BRIDGE_DEVICE_HOST      = "127.0.0.1:15000"
-	BRIDGE_DEVICE_HOST_IPv6 = "[::1]:15001"
+	BRIDGE_DEVICE_HOST      = "127.0.0.1:0" // 0 means random port
+	BRIDGE_DEVICE_HOST_IPv6 = "[::1]:0"     // 0 means random port
 )
 
 func MakeConfig(t *testing.T) service.Config {