Chain ID List: EVM Networks, RPC URLs and MetaMask Settings

Q: "Where do chain IDs come from?"

"Each network picks its own number and registers it in the public chain list (ethereum-lists/chains). Wallets reject an RPC that reports a different ID than the one you enter."

Q: "Is the chain ID the same as the network ID?"

"Not always. The chain ID (EIP-155) is used for signing transactions; the older net_version network ID can differ on some networks. Wallets use the chain ID."

Every EVM network has a chain ID: a number written into each signed transaction so it cannot be replayed on another network. The table lists the main chain IDs; each network page has the full MetaMask settings, public RPC URLs we tested on October 27, 2026 and testnet details.

Network	Chain ID	Hex	Gas token
Ethereum	1	0x1	ETH
Optimism (OP Mainnet)	10	0xa	ETH
Cronos	25	0x19	CRO
BNB Smart Chain (BSC)	56	0x38	BNB
Gnosis Chain	100	0x64	XDAI
Unichain	130	0x82	ETH
Polygon	137	0x89	POL
Monad	143	0x8f	MON
Sonic	146	0x92	S
zkSync Era	324	0x144	ETH
Flow EVM	747	0x2eb	FLOW
HyperEVM	999	0x3e7	HYPE
Metis	1088	0x440	METIS
Sei EVM	1329	0x531	SEI
Soneium	1868	0x74c	ETH
Ronin	2020	0x7e4	RON
Mantle	5000	0x1388	MNT
Base	8453	0x2105	ETH
Plasma	9745	0x2611	XPL
ApeChain	33139	0x8173	APE
Mode	34443	0x868b	ETH
Arbitrum One	42161	0xa4b1	ETH
Celo	42220	0xa4ec	CELO
Avalanche C-Chain	43114	0xa86a	AVAX
Ink	57073	0xdef1	ETH
Linea	59144	0xe708	ETH
Berachain	80094	0x138de	BERA
Blast	81457	0x13e31	ETH
Scroll	534352	0x82750	ETH
Sepolia	11155111	0xaa36a7	ETH

New to this? Start with what a chain ID is and how to add a network to MetaMask.

FAQ

Where do chain IDs come from?

Each network picks its own number and registers it in the public chain list (ethereum-lists/chains). Wallets reject an RPC that reports a different ID than the one you enter.

Is the chain ID the same as the network ID?

Not always. The chain ID (EIP-155) is used for signing transactions; the older net_version network ID can differ on some networks. Wallets use the chain ID.