diff --git a/private_test.go b/private_test.go
new file mode 100644
index 0000000..d93fde3
--- /dev/null
+++ b/private_test.go
@@ -0,0 +1,27 @@
+package manet
+
+import (
+	"testing"
+
+	ma "github.com/multiformats/go-multiaddr"
+)
+
+func TestIsPublicAddr(t *testing.T) {
+	a, err := ma.NewMultiaddr("/ip4/192.168.1.1/tcp/80")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if IsPublicAddr(a) {
+		t.Fatal("192.168.1.1 is not a public address!")
+	}
+
+	a, err = ma.NewMultiaddr("/ip4/1.1.1.1/tcp/80")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !IsPublicAddr(a) {
+		t.Fatal("1.1.1.1 is a public address!")
+	}
+}