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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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besu/docs/Configuring-Pantheon/NetworkID-And-ChainID.md

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Doc migration (#381) Readthedoc migration, still some content to update from the wiki that were updated after I made the last diff - fixes #406 by configuring readthedocs - fixes #407 by configuring material theme - fixes #408 by adding footer with jQuery to enable readthedocs.org versions - fixes #409 - fixes #410 - fixes #411
6 years ago
description: Pantheon network ID and chain ID implementation
<!--- END of page meta data -->
# Network ID and Chain ID
Ethereum networks have a **network ID** and a **chain ID**. The network ID is specified using the [`--network-id`](../Reference/Pantheon-CLI-Syntax.md#network-id) option and the chain ID is specified in the genesis file.
For most networks including mainnet and the public testnets, the network ID and the chain ID are the same.
The network ID is automatically set by Pantheon when connecting to the Ethereum mainnet ==1==, Rinkeby ==4==, and Ropsten ==3==.
When using the [`--dev-mode`](../Reference/Pantheon-CLI-Syntax.md#dev-mode) or [`--genesis`](../Reference/Pantheon-CLI-Syntax.md#genesis) options, specify the network ID using the [`--network-id`](../Reference/Pantheon-CLI-Syntax.md#network-id) option.