diff --git a/PaymentKit Example/PaymentKit Test/PKCardCVCTest.h b/PaymentKit Example/PaymentKit Test/PTKCardCVCTest.h
similarity index 100%
rename from PaymentKit Example/PaymentKit Test/PKCardCVCTest.h
rename to PaymentKit Example/PaymentKit Test/PTKCardCVCTest.h
diff --git a/PaymentKit Example/PaymentKit Test/PKCardCVCTest.m b/PaymentKit Example/PaymentKit Test/PTKCardCVCTest.m
similarity index 100%
rename from PaymentKit Example/PaymentKit Test/PKCardCVCTest.m
rename to PaymentKit Example/PaymentKit Test/PTKCardCVCTest.m
diff --git a/PaymentKit Example/PaymentKit Test/PKCardExpiryTest.h b/PaymentKit Example/PaymentKit Test/PTKCardExpiryTest.h
similarity index 100%
rename from PaymentKit Example/PaymentKit Test/PKCardExpiryTest.h
rename to PaymentKit Example/PaymentKit Test/PTKCardExpiryTest.h
diff --git a/PaymentKit Example/PaymentKit Test/PKCardExpiryTest.m b/PaymentKit Example/PaymentKit Test/PTKCardExpiryTest.m
similarity index 100%
rename from PaymentKit Example/PaymentKit Test/PKCardExpiryTest.m
rename to PaymentKit Example/PaymentKit Test/PTKCardExpiryTest.m
diff --git a/PaymentKit Example/PaymentKit Test/PKCardNumberTest.h b/PaymentKit Example/PaymentKit Test/PTKCardNumberTest.h
similarity index 100%
rename from PaymentKit Example/PaymentKit Test/PKCardNumberTest.h
rename to PaymentKit Example/PaymentKit Test/PTKCardNumberTest.h
diff --git a/PaymentKit Example/PaymentKit Test/PKCardNumberTest.m b/PaymentKit Example/PaymentKit Test/PTKCardNumberTest.m
similarity index 86%
rename from PaymentKit Example/PaymentKit Test/PKCardNumberTest.m
rename to PaymentKit Example/PaymentKit Test/PTKCardNumberTest.m
index 70ce78b..15a1644 100644
--- a/PaymentKit Example/PaymentKit Test/PKCardNumberTest.m	
+++ b/PaymentKit Example/PaymentKit Test/PTKCardNumberTest.m	
@@ -14,15 +14,35 @@ @implementation PTKCardNumberTest
 
 - (void)testCardType
 {
+    // Amex card detection
     XCTAssertEqual([CNUMBER(@"378282246310005") cardType], PTKCardTypeAmex, @"Detects Amex");
     XCTAssertEqual([CNUMBER(@"371449635398431") cardType], PTKCardTypeAmex, @"Detects Amex");
+    
+    // Diners club detection
     XCTAssertEqual([CNUMBER(@"30569309025904") cardType], PTKCardTypeDinersClub, @"Detects Diners Club");
+    
+    // Discover card detection
     XCTAssertEqual([CNUMBER(@"6011111111111117") cardType], PTKCardTypeDiscover, @"Detects Discover");
     XCTAssertEqual([CNUMBER(@"6011000990139424") cardType], PTKCardTypeDiscover, @"Detects Discover");
+    XCTAssertEqual([CNUMBER(@"6441234567890123") cardType], PTKCardTypeDiscover, @"Detects Discover");
+    XCTAssertEqual([CNUMBER(@"6481234567890123") cardType], PTKCardTypeDiscover, @"Detects Discover");
+    XCTAssertEqual([CNUMBER(@"6491234567890123") cardType], PTKCardTypeDiscover, @"Detects Discover");
+
+    // JCB detection
     XCTAssertEqual([CNUMBER(@"3530111333300000") cardType], PTKCardTypeJCB, @"Detects JCB");
+    
+    // MasterCard detection
     XCTAssertEqual([CNUMBER(@"5555555555554444") cardType], PTKCardTypeMasterCard, @"Detects MasterCard");
+    
+    // Visa detection
     XCTAssertEqual([CNUMBER(@"4111111111111111") cardType], PTKCardTypeVisa, @"Detects Visa");
     XCTAssertEqual([CNUMBER(@"4012888888881881") cardType], PTKCardTypeVisa, @"Detects Visa");
+    
+    // Maestro card detection
+    XCTAssertEqual([CNUMBER(@"5012345678901234") cardType], PTKCardTypeMaestro, @"Detects Maestro");
+    XCTAssertEqual([CNUMBER(@"6759649826438453") cardType], PTKCardTypeMaestro, @"Detects Maestro");
+    XCTAssertEqual([CNUMBER(@"5659649826438453") cardType], PTKCardTypeMaestro, @"Detects Maestro");
+    XCTAssertEqual([CNUMBER(@"6959649826438453") cardType], PTKCardTypeMaestro, @"Detects Maestro");
 }
 
 - (void)testLast4
diff --git a/PaymentKit/PTKCardNumber.m b/PaymentKit/PTKCardNumber.m
index 8edb857..2e5c53a 100644
--- a/PaymentKit/PTKCardNumber.m
+++ b/PaymentKit/PTKCardNumber.m
@@ -41,7 +41,7 @@ - (PTKCardType)cardType
 
     if (range >= 40 && range <= 49) {
         return PTKCardTypeVisa;
-    } else if (range >= 50 && range <= 59) {
+    } else if (range >= 51 && range <= 55) {
         return PTKCardTypeMasterCard;
     } else if (range == 34 || range == 37) {
         return PTKCardTypeAmex;
@@ -51,6 +51,8 @@ - (PTKCardType)cardType
         return PTKCardTypeJCB;
     } else if (range == 30 || range == 36 || range == 38 || range == 39) {
         return PTKCardTypeDinersClub;
+    } else if (range == 50 || (range >= 56 && range <= 69)) {
+        return PTKCardTypeMaestro;
     } else {
         return PTKCardTypeUnknown;
     }
diff --git a/PaymentKit/PTKCardType.h b/PaymentKit/PTKCardType.h
index a761ebd..b78cd31 100644
--- a/PaymentKit/PTKCardType.h
+++ b/PaymentKit/PTKCardType.h
@@ -16,7 +16,8 @@ typedef enum {
     PTKCardTypeDiscover,
     PTKCardTypeJCB,
     PTKCardTypeDinersClub,
-    PTKCardTypeUnknown
+    PTKCardTypeMaestro,
+    PTKCardTypeUnknown,
 } PTKCardType;
 
 #endif