diff --git a/proxy/dokodemo/dokodemo.go b/proxy/dokodemo/dokodemo.go
index 53d61c100..56402963a 100644
--- a/proxy/dokodemo/dokodemo.go
+++ b/proxy/dokodemo/dokodemo.go
@@ -40,6 +40,9 @@ func New(ctx context.Context, config *Config) (*DokodemoDoor, error) {
 	if meta == nil {
 		return nil, errors.New("Dokodemo: No outbound meta in context.")
 	}
+	if config.NetworkList == nil || config.NetworkList.Size() == 0 {
+		return nil, errors.New("DokodemoDoor: No network specified.")
+	}
 	d := &DokodemoDoor{
 		config:  config,
 		address: config.GetPredefinedAddress(),
@@ -76,16 +79,16 @@ func (v *DokodemoDoor) Close() {
 	}
 }
 
+func (v *DokodemoDoor) Network() net.NetworkList {
+	return *(v.config.NetworkList)
+}
+
 func (v *DokodemoDoor) Start() error {
 	if v.accepting {
 		return nil
 	}
 	v.accepting = true
 
-	if v.config.NetworkList == nil || v.config.NetworkList.Size() == 0 {
-		return errors.New("DokodemoDoor: No network specified.")
-	}
-
 	if v.config.NetworkList.HasNetwork(net.Network_TCP) {
 		err := v.ListenTCP()
 		if err != nil {
diff --git a/proxy/http/server.go b/proxy/http/server.go
index 09239028e..e186871ce 100644
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -1,6 +1,7 @@
 package http
 
 import (
+	"context"
 	"io"
 	"net"
 	"net/http"
@@ -8,8 +9,6 @@ import (
 	"strings"
 	"sync"
 
-	"context"
-
 	"v2ray.com/core/app"
 	"v2ray.com/core/app/dispatcher"
 	"v2ray.com/core/common"
@@ -62,6 +61,12 @@ func (v *Server) Port() v2net.Port {
 	return v.meta.Port
 }
 
+func (v *Server) Network() v2net.NetworkList {
+	return v2net.NetworkList{
+		Network: []v2net.Network{v2net.Network_TCP},
+	}
+}
+
 // Close implements InboundHandler.Close().
 func (v *Server) Close() {
 	v.accepting = false
diff --git a/proxy/proxy.go b/proxy/proxy.go
index b743b22cf..ab167a882 100644
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -54,6 +54,8 @@ type InboundHandler interface {
 	Close()
 	// Port returns the port that the handler is listening on.
 	Port() net.Port
+
+	Network() net.NetworkList
 }
 
 // An OutboundHandler handles outbound network connection for V2Ray.
diff --git a/proxy/shadowsocks/server.go b/proxy/shadowsocks/server.go
index c69921d71..72850cbb5 100644
--- a/proxy/shadowsocks/server.go
+++ b/proxy/shadowsocks/server.go
@@ -67,6 +67,16 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 	return s, nil
 }
 
+func (v *Server) Network() net.NetworkList {
+	list := net.NetworkList{
+		Network: []net.Network{net.Network_TCP},
+	}
+	if v.config.UdpEnabled {
+		list.Network = append(list.Network, net.Network_UDP)
+	}
+	return list
+}
+
 func (v *Server) Port() net.Port {
 	return v.meta.Port
 }
diff --git a/proxy/socks/server.go b/proxy/socks/server.go
index 31f70909e..748b59928 100644
--- a/proxy/socks/server.go
+++ b/proxy/socks/server.go
@@ -59,6 +59,16 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 	return s, nil
 }
 
+func (v *Server) Network() net.NetworkList {
+	list := net.NetworkList{
+		Network: []net.Network{net.Network_TCP},
+	}
+	if v.config.UdpEnabled {
+		list.Network = append(list.Network, net.Network_UDP)
+	}
+	return list
+}
+
 // Port implements InboundHandler.Port().
 func (v *Server) Port() net.Port {
 	return v.meta.Port
diff --git a/proxy/vmess/inbound/inbound.go b/proxy/vmess/inbound/inbound.go
index 7b0ef4892..a1054ca47 100644
--- a/proxy/vmess/inbound/inbound.go
+++ b/proxy/vmess/inbound/inbound.go
@@ -120,6 +120,12 @@ func New(ctx context.Context, config *Config) (*VMessInboundHandler, error) {
 	return handler, nil
 }
 
+func (v *VMessInboundHandler) Network() net.NetworkList {
+	return net.NetworkList{
+		Network: []net.Network{net.Network_TCP},
+	}
+}
+
 func (v *VMessInboundHandler) Port() net.Port {
 	return v.meta.Port
 }