Ethereum: How can you find out what is the latest block number?

Ethereum: How to Find the Latest Block Number

When you are using a new Ethereum client or after it has been idle, it can take some time for the network to catch up and download new blocks. One of the main indicators of when this has happened is the target block number, also known as the “target” or “height”. In this article, we will explore how to find out what the latest block number is.

Why do Ethereum clients have to wait?

The Ethereum blockchain is made up of a series of blocks, each containing new transactions and data. Each block has a unique identifier called a “block hash” that acts as a reference for verifying transactions on the network. When a client needs to check the latest block number, it needs to download all previous blocks from the blockchain.

This process is called “block confirmation”. As the client downloads each block, it updates its internal state with the latest information about the network’s activity. The time it takes for the client to validate and update this state depends on several factors, including:

• Network speed: A faster connection means the client can download blocks faster.

• Number of concurrent transactions: Performing more transactions at the same time increases the time it takes to validate a block.

• Blockchain complexity: A more complex chain with many layers and branches may require longer validation times.

How ​​​to find out the latest block number

You can determine the latest block number using one or more of the following methods:

• Check your client documentation: Most Ethereum clients have a built-in help system that provides information on how to check the latest block number.

• Use --block-number option

  : When running the client from the command line, add the --block-number option followed by the target field value to the client configuration file or settings. For example:

ethers.js --config path/to/config.json --target=0x1234567890abcdef

This will display the current block number.

• Check a blockchain explorer: A blockchain explorer like Ethereum Explorer (e.g. [etherscan.io]( will provide information about the latest block number, including the target field.

• Use an online tool

  : There are several online tools that you can use to check the latest Ethereum block number, such as [Ethereum Block Number Calculator](

Conclusion

Finding the latest block number is a crucial step in understanding how your Ethereum client is working and whether it is having issues with block validation. Using one or more of the methods above, you should be able to determine the current target block number.

Remember that the network is constantly evolving, so even if you found the latest block number recently, changes may have occurred since then. Always keep your client up to date and check Blockchain Explorer regularly for any updates or network-related issues.

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