List of Ethereum’s Major Network and Chain IDs

• Ethereum network uses different IDs in its main network and several test networks.
• By the combination of Network ID and Chain ID, Ethereum nodes can choose nodes to be connected and generate different signed transactions.
• Chain ID was introduced as EIP155 when Ethereum Classic was forked from Ethereum to prevent double-spending attacks.
• Detail: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md

List of Ethereum’s Major Network and Chain IDs

Mainnet : Ethereum main network

• network_id: 1
• chain_id: 1

Ropsten : Ethereum test network (PoW)

• network_id: 3
• chain_id: 3

Rinkeby : Ethereum test network (PoA)

• network_id: 4
• chain_id: 4

Kovan : Ethereum test network (PoA)

• network_id: 42
• chain_id: 42

Ethereum Classic Mainnet : Ethereum Classic main network

• network_id: 1
• chain_id: 61

Morden : Ethereum Classic test network

• network_id: 2
• chain_id: 62

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