diff --git a/server/listener_unix.go b/server/listener_unix.go
index 51a9e80..2c3efd0 100644
--- a/server/listener_unix.go
+++ b/server/listener_unix.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package server
@@ -15,10 +16,10 @@ func init() {
 
 func reuseportMakeListener(s *Server, address string) (ln net.Listener, err error) {
 	var network string
-	if validIP4(address) {
-		network = "tcp4"
-	} else {
+	if validIP6(address) {
 		network = "tcp6"
+	} else {
+		network = "tcp4"
 	}
 
 	return reuseport.NewReusablePortListener(network, address)
diff --git a/server/server.go b/server/server.go
index d2525ed..2b91700 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1008,3 +1008,17 @@ func validIP4(ipAddress string) bool {
 
 	return ip4Reg.MatchString(ipAddress)
 }
+
+func validIP6(ipAddress string) bool {
+	ipAddress = strings.Trim(ipAddress, " ")
+	i := strings.LastIndex(ipAddress, ":")
+	ipAddress = ipAddress[:i] // remove port
+	ipAddress = strings.TrimPrefix(ipAddress, "[")
+	ipAddress = strings.TrimSuffix(ipAddress, "]")
+	ip := net.ParseIP(ipAddress)
+	if ip != nil && ip.To4() == nil {
+		return true
+	} else {
+		return false
+	}
+}
diff --git a/server/server_test.go b/server/server_test.go
index c8b40b4..3e36328 100644
--- a/server/server_test.go
+++ b/server/server_test.go
@@ -178,3 +178,26 @@ func TestHandler(t *testing.T) {
 
 	assert.Equal(t, "{\"C\":200}", string(resp.Payload))
 }
+
+func Test_validIP6(t *testing.T) {
+	type args struct {
+		ipAddress string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{"1", args{ipAddress: "[CDCD:910A:2222:5498:8475:1111:3900:2020]:8080"}, true},
+		{"2", args{ipAddress: "[1030::C9B4:FF12:48AA:1A2B]:8080"}, true},
+		{"3", args{ipAddress: "[2000:0:0:0:0:0:0:1]:8080"}, true},
+		{"4", args{ipAddress: "127.0.0.1:8080"}, false},
+		{"5", args{ipAddress: "localhost:8080"}, false},
+		{"6", args{ipAddress: "127.1:8080"}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equalf(t, tt.want, validIP6(tt.args.ipAddress), "validIP6(%v)", tt.args.ipAddress)
+		})
+	}
+}