diff --git a/packages/neuron-ui/src/components/Addresses/index.tsx b/packages/neuron-ui/src/components/Addresses/index.tsx
index 2ef12764cb..0afdffb770 100644
--- a/packages/neuron-ui/src/components/Addresses/index.tsx
+++ b/packages/neuron-ui/src/components/Addresses/index.tsx
@@ -20,6 +20,7 @@ import { StateWithDispatch } from 'states/stateProvider/reducer'
 import { useLocalDescription } from 'utils/hooks'
 import { localNumberFormatter, shannonToCKBFormatter } from 'utils/formatters'
 import { onRenderRow } from 'utils/fabricUIRender'
+import { MAINNET_TAG } from 'utils/const'
 
 const Addresses = ({
   app: {
@@ -30,8 +31,7 @@ const Addresses = ({
   settings: { networks = [] },
   dispatch,
 }: React.PropsWithoutRef<StateWithDispatch & RouteComponentProps>) => {
-  const isMainnet =
-    (networks.find(n => n.id === networkID) || {}).chain === (process.env.REACT_APP_MAINNET_TAG || 'ckb')
+  const isMainnet = (networks.find(n => n.id === networkID) || {}).chain === MAINNET_TAG
   const [showMainnetAddress, setShowMainnetAddress] = useState(false)
   const [t] = useTranslation()
 
diff --git a/packages/neuron-ui/src/components/Transaction/index.tsx b/packages/neuron-ui/src/components/Transaction/index.tsx
index 54b83c0b54..8aa66a5740 100644
--- a/packages/neuron-ui/src/components/Transaction/index.tsx
+++ b/packages/neuron-ui/src/components/Transaction/index.tsx
@@ -8,7 +8,7 @@ import { ckbCore } from 'services/chain'
 import { transactionState } from 'states/initStates/chain'
 
 import { localNumberFormatter, uniformTimeFormatter, shannonToCKBFormatter } from 'utils/formatters'
-import { ErrorCode } from 'utils/const'
+import { ErrorCode, MAINNET_TAG } from 'utils/const'
 import { explorerNavButton } from './style.module.scss'
 
 const MIN_CELL_WIDTH = 70
@@ -30,9 +30,11 @@ const CompactAddress = ({ address }: { address: string }) => (
 const Transaction = () => {
   const [t] = useTranslation()
   const [transaction, setTransaction] = useState(transactionState)
-  const [addressPrefix, setAddressPrefix] = useState(ckbCore.utils.AddressPrefix.Mainnet)
+  const [isMainnet, setIsMainnet] = useState(false)
   const [error, setError] = useState({ code: '', message: '' })
 
+  const addressPrefix = isMainnet ? ckbCore.utils.AddressPrefix.Mainnet : ckbCore.utils.AddressPrefix.Testnet
+
   const inputColumns: IColumn[] = useMemo(
     () =>
       [
@@ -198,11 +200,7 @@ const Transaction = () => {
             throw new Error('Cannot find current network in the network list')
           }
 
-          setAddressPrefix(
-            network.chain === process.env.REACT_APP_MAINNET_TAG
-              ? ckbCore.utils.AddressPrefix.Mainnet
-              : ckbCore.utils.AddressPrefix.Testnet
-          )
+          setIsMainnet(network.chain === MAINNET_TAG)
         }
       })
       .catch(err => console.warn(err))
@@ -246,10 +244,10 @@ const Transaction = () => {
     })
   }, [])
 
-  // TODO: add conditional branch on mainnet and testnet
   const onExplorerBtnClick = useCallback(() => {
-    openExternal(`https://explorer.nervos.org/transaction/${transaction.hash}`)
-  }, [transaction.hash])
+    const explorerUrl = isMainnet ? 'https://explorer.nervos.org' : 'https://explorer.nervos.org/testnet'
+    openExternal(`${explorerUrl}/transaction/${transaction.hash}`)
+  }, [transaction.hash, isMainnet])
 
   const basicInfoItems = useMemo(
     () => [
diff --git a/packages/neuron-ui/src/utils/const.ts b/packages/neuron-ui/src/utils/const.ts
index 135ae4ab4f..f6d812a7d7 100644
--- a/packages/neuron-ui/src/utils/const.ts
+++ b/packages/neuron-ui/src/utils/const.ts
@@ -10,6 +10,7 @@ export const UNREMOVABLE_NETWORK_ID = '0'
 export const CONFIRMATION_THRESHOLD = 30
 
 export const MAX_DECIMAL_DIGITS = 8
+export const MAINNET_TAG = 'ckb'
 
 export enum ConnectionStatus {
   Online = 'online',
diff --git a/packages/neuron-wallet/src/models/chain-info.ts b/packages/neuron-wallet/src/models/chain-info.ts
index d5fbf6394b..630fc3ac22 100644
--- a/packages/neuron-wallet/src/models/chain-info.ts
+++ b/packages/neuron-wallet/src/models/chain-info.ts
@@ -27,6 +27,6 @@ export default class ChainInfo {
     if (this.isMainnet()) {
       return "https://explorer.nervos.org"
     }
-    return "https://explorer.nervos.org" // TODO: change this to proper testnet explorer URL
+    return "https://explorer.nervos.org/testnet"
   }
 }