diff --git a/lib/address.js b/lib/address.js
index eed31ef..f399536 100644
--- a/lib/address.js
+++ b/lib/address.js
@@ -37,13 +37,24 @@ function Address(opts) {
   objectAssign(this, opts);
 }
 
+/**
+ * Test if given object is an Address instance. NOTE: Implementation is
+ * just simple `instanceof` but it improves readability and consistent
+ * with `isArray`, `isBuffer`, etc.
+ * @param {Object} obj - Given object
+ * @return {boolean}
+ */
+Address.isAddress = function(obj) {
+  return obj instanceof Address;
+};
+
 /**
  * Parse Bitmessage address into address object.
  * @param {String} str - Address string (with or without `BM-` prefix)
  * @return {Address} Decoded address object.
  */
 Address.decode = function(str) {
-  if (str instanceof Address) {
+  if (Address.isAddress(str)) {
     return str;
   }
 
diff --git a/test.js b/test.js
index 068b257..a276e9d 100644
--- a/test.js
+++ b/test.js
@@ -606,6 +606,13 @@ describe("High-level classes", function() {
       expect(addr.getRipe({short: true}).toString("hex")).to.equal("69617ddb1946dc327cadffcf33889fed587fc1e7");
     });
 
+    it("should implement isAddress method", function() {
+      var addr = Address();
+      expect(Address.isAddress(addr)).to.be.true;
+      expect(Address.isAddress(null)).to.be.false;
+      expect(Address.isAddress({})).to.be.false;
+    });
+
     // FIXME(Kagami): Don't run it in browser currently because it's
     // very slow. This need to be fixed.
     if (allTests && typeof window === "undefined") {