Ref: https://ethereum.stackexchange.com/questions/17051/how-to-select-a-network-id-or-is-there-a-list-of-network-ids/17101#17101

• 0: Olympic, Ethereum public pre-release testnet
• 1: Frontier, Homestead, Metropolis, the Ethereum public main network
• 1: Classic, the (un)forked public Ethereum Classic main network, chain ID 61
• 1: Expanse, an alternative Ethereum implementation, chain ID 2
• 2: Morden, the public Ethereum testnet, now Ethereum Classic testnet
• 3: Ropsten, the public cross-client Ethereum testnet
• 4: Rinkeby, the public Geth Ethereum testnet
• 42: Kovan, the public Parity Ethereum testnet
• 77: Sokol, the public POA testnet
• 99: POA, the public Proof of Authority Ethereum network
• 7762959: Musicoin, the music blockchain