diff --git a/cadence/contracts/AddressUtils.cdc b/cadence/contracts/AddressUtils.cdc
index 6272f6b..add46be 100644
--- a/cadence/contracts/AddressUtils.cdc
+++ b/cadence/contracts/AddressUtils.cdc
@@ -61,7 +61,8 @@ pub contract AddressUtils {
         let codeWords: {String: UInt64} = {
             "MAINNET" : 0,
             "TESTNET" : 0x6834ba37b3980209,
-            "EMULATOR": 0x1cb159857af02018
+            "EMULATOR": 0x1cb159857af02018,
+            "PREVIEWNET": 0x5211829e88528817
         }
 
         let parityCheckMatrixColumns: [UInt64] = [
diff --git a/test/AddressUtils_test.cdc b/test/AddressUtils_test.cdc
index 486dc22..fb2cf66 100644
--- a/test/AddressUtils_test.cdc
+++ b/test/AddressUtils_test.cdc
@@ -99,9 +99,10 @@ fun testIsValidAddress() {
     let mainnet = AddressUtils.isValidAddress("0xa340dc0a4ec828ab", forNetwork: "MAINNET")
     let testnet = AddressUtils.isValidAddress("0x31ad40c07a2a9788", forNetwork: "TESTNET")
     let emulator = AddressUtils.isValidAddress("0xf8d6e0586b0a20c7", forNetwork: "EMULATOR")
+    let previewnet = AddressUtils.isValidAddress("0x30a71a4767f0e14f", forNetwork: "PREVIEWNET")
 
     // Assert
-    Test.assert(mainnet && testnet && emulator)
+    Test.assert(mainnet && testnet && emulator && previewnet)
 
     // Act
     var valid = AddressUtils.isValidAddress(1452, forNetwork: "EMULATOR")