# Supported Networks
Source: https://docs.chain.link/ace/supported-networks
Last Updated: 2026-05-26

> For the complete documentation index, see [llms.txt](/llms.txt).

ACE Beta is available on the following networks.

## Mainnet networks

Network
Chain ID
Chain Selector

Ethereum Mainnet

`1`

`5009297550715157269`

Arbitrum Mainnet

`42161`

`4949039107694359620`

Avalanche Mainnet

`43114`

`6433500567565415381`

Base Mainnet

`8453`

`15971525489660198786`

Polygon Mainnet

`137`

`4051577828743386545`

## Testnet networks

Network
Chain ID
Chain Selector

Ethereum Sepolia

`11155111`

`16015286601757825753`

Arbitrum Sepolia

`421614`

`3478487238524512106`

Avalanche Fuji

`43113`

`14767482510784806043`

Base Sepolia

`84532`

`10344971235874465080`

Polygon Amoy

`80002`

`16281711391670634445`

> **NOTE: About chain selectors**
>
> A **chain selector** is Chainlink's unique numeric identifier for each blockchain network. Unlike chain IDs, chain
> selectors are globally unique across all supported networks. The Coordinator API uses chain selectors — not chain IDs
> — in all multi-chain operations such as creating policy engines, registering targets, or deploying protections.