> ## Documentation Index
> Fetch the complete documentation index at: https://docs.phantom.com/llms.txt
> Use this file to discover all available pages before exploring further.

# networkVersion

> Read the legacy networkVersion property to get the numeric network ID of the connected blockchain.

## window\.ethereum.networkVersion

The network number of the blockchain that you are connected to. This property is available for legacy purposes. It is recommended that modern dapps refer to the `chainId` property to determine what chain a user is connected to currently.

```javascript theme={null}
const networkVersion = window.phantom.ethereum.networkVersion;
console.log(networkVersion);
// "1"
// Ethereum Mainnet's Network Version
```