EVM Chain ID Lookup
Look up EVM chain IDs by network name or number. Find the chain ID for Ethereum, Polygon, Arbitrum, Base, BNB Chain and more.
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Look up EVM chain IDs by network name or number.
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Look up EVM chain IDs
Every EVM-compatible blockchain has a unique chain ID, a number that wallets and applications use to identify the network and to protect against replay attacks. This reference lets you search the chain IDs of the major Ethereum mainnet, layer-2 networks and testnets by name or number. Type polygon to find its chain ID of 137, enter 42161 to confirm it is Arbitrum One, or browse the full list. The table shows the chain ID, the network name and its native currency symbol.
Chain IDs are essential whenever you add a custom network to a wallet or configure a deployment.
Why chain IDs matter
When you add a network to a wallet like MetaMask or configure a development tool, you must supply the correct chain ID, and a mismatch can cause failed transactions or, worse, signing a transaction intended for a different network. The chain ID is also used in transaction signing to prevent a signed transaction on one chain from being replayed on another. Keeping a reliable reference handy avoids these errors.
This list covers the most widely used networks; the broader ecosystem has many more. All searching happens locally in your browser.
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Frequently Asked Questions
What is an EVM chain ID?
It is a unique number identifying an EVM-compatible blockchain, used by wallets and apps to select the network and prevent cross-chain replay.
Why do I need the chain ID?
You must enter the correct chain ID when adding a custom network to a wallet or configuring a deployment, or transactions may fail.
How does chain ID prevent replay attacks?
The chain ID is included in transaction signing, so a transaction signed for one chain cannot be replayed on a different chain.
Does this list every network?
No. It covers the major mainnets, layer-2s and testnets. The full ecosystem has many more chains, each with its own ID.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Type a network name or chain ID to find matching chains.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.