diff --git a/wire/protocol.go b/wire/protocol.go
index 8cc9838a55..5ce6b6f3fd 100644
--- a/wire/protocol.go
+++ b/wire/protocol.go
@@ -155,6 +155,9 @@ const (
 	// TestNet3 represents the test network (version 3).
 	TestNet3 BitcoinNet = 0x0709110b
 
+	// TestNet4 represents the test network (version 4).
+	TestNet4 BitcoinNet = 0x283f161c
+
 	// SimNet represents the simulation test network.
 	SimNet BitcoinNet = 0x12141c16
 )
@@ -165,6 +168,7 @@ var bnStrings = map[BitcoinNet]string{
 	MainNet:  "MainNet",
 	TestNet:  "TestNet",
 	TestNet3: "TestNet3",
+	TestNet4: "TestNet4",
 	SimNet:   "SimNet",
 }