diff --git a/wire/protocol.go b/wire/protocol.go
index b6e5ea92..65d19f52 100644
--- a/wire/protocol.go
+++ b/wire/protocol.go
@@ -179,6 +179,9 @@ const (
 	// TestNet3 represents the test network (version 3).
 	TestNet3 BitcoinNet = 0x0709110b
 
+	// TestNet4 represents the test network (version 4).
+	TestNet4 BitcoinNet = 0x283f161c
+
 	// SigNet represents the public default SigNet. For custom signets,
 	// see CustomSignetParams.
 	SigNet BitcoinNet = 0x40CF030A
@@ -193,6 +196,7 @@ var bnStrings = map[BitcoinNet]string{
 	MainNet:  "MainNet",
 	TestNet:  "TestNet",
 	TestNet3: "TestNet3",
+	TestNet4: "TestNet4",
 	SigNet:   "SigNet",
 	SimNet:   "SimNet",
 }
diff --git a/wire/protocol_test.go b/wire/protocol_test.go
index 5ab5b9dd..46498849 100644
--- a/wire/protocol_test.go
+++ b/wire/protocol_test.go
@@ -49,6 +49,7 @@ func TestBitcoinNetStringer(t *testing.T) {
 		{MainNet, "MainNet"},
 		{TestNet, "TestNet"},
 		{TestNet3, "TestNet3"},
+		{TestNet4, "TestNet4"},
 		{SigNet, "SigNet"},
 		{SimNet, "SimNet"},
 		{0xffffffff, "Unknown BitcoinNet (4294967295)"},