eth networkId 分类

• 0: Olympic, Ethereum public pre-release PoW testnet
• 1: Frontier, Homestead, Metropolis, the Ethereum public PoW main network
• 1: Classic, the (un)forked public Ethereum Classic PoW main network, chain ID 61
• 1: Expanse, an alternative Ethereum implementation, chain ID 2
• 2: Morden Classic, the public Ethereum Classic PoW testnet
• 3: Ropsten, the public cross-client Ethereum PoW testnet
• 4: Rinkeby, the public Geth-only PoA testnet
• 5: Goerli, the public cross-client PoA testnet
• 6: Kotti Classic, the public cross-client PoA testnet for Classic
• 8: Ubiq, the public Gubiq main network with flux difficulty chain ID 8
• 42: Kovan, the public Parity-only PoA testnet
• 60: GoChain, the GoChain networks mainnet
• 77: Sokol, the public POA Network testnet
• 99: Core, the public POA Network main network
• 100: xDai, the public MakerDAO/POA Network main network
• 31337: GoChain testnet, the GoChain networks public testnet
• 401697: Tobalaba, the public Energy Web Foundation testnet
• 7762959: Musicoin, the music blockchain
• 61717561: Aquachain, ASIC resistant chain
• [Other]: Could indicate that your connected to a local development test network.

参考：

https://ethereum.stackexchange.com/a/17101