> For the complete documentation index, see [llms.txt](https://docs.ainetwork.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ainetwork.ai/ain-blockchain/ai-network-design/network-id-and-chain-id.md).

# Network ID and Chain ID

The blockchain network has two identifiers, Network ID and Chain ID.

Network IDs are for blockchain node communication and Chain IDs are for signing transactions.

| Network Name           | Network ID | Chain ID |
| ---------------------- | ---------- | -------- |
| Testnet                | 0          | 0        |
| Mainnet                | 1          | 1        |
| Devnet                 | 2          | 2        |
| Reserved (to be added) | 3\~        | 3\~      |