# CCIP Chain Selectors Reference

**Last Updated:** 2026-01-31

CCIP uses numeric chain selectors for cross-chain routing. Set `CCIP_DEST_CHAIN_SELECTOR` when using `run-send-cross-chain.sh`.

## Common Chain Selectors

| Chain | Selector (decimal) |
|-------|--------------------|
| Ethereum Mainnet | 5009297550715157269 |
| Arbitrum One | 4949039107694359620 |
| Polygon | 4051577828743386545 |
| Avalanche | 6433500567565415381 |
| Base | 15971525489660198786 |
| Optimism | 3734403246176062136 |
| BSC (BNB Chain) | 11344663589394136015 |
| Gnosis Chain | 465200170687744372 |
| Celo | 1346049177634351622 |
| Wemix | 5142893604156789321 |

## Source

Chain selectors are from Chainlink CCIP documentation. Verify current values at:
- https://docs.chain.link/ccip/supported-networks
- Bridge contract `getChainSelector()` or router config

## Usage

```bash
# Send to Ethereum mainnet (default)
./scripts/bridge/run-send-cross-chain.sh 0.01

# Send to Polygon
CCIP_DEST_CHAIN_SELECTOR=4051577828743386545 ./scripts/bridge/run-send-cross-chain.sh 0.01
```