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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.

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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. 
const networkVersion = window.phantom.ethereum.networkVersion;
console.log(networkVersion);
// "1"
// Ethereum Mainnet's Network Version