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description Learn about addresses in Sui — 32-byte unique identifiers used to locate packages, accounts, and objects on the blockchain.

Address

An address is a unique identifier of a location on the blockchain. It is used to identify packages, accounts, and objects. An address has a fixed size of 32 bytes and is usually represented as a hexadecimal string prefixed with 0x. Addresses are case insensitive.

0xe51ff5cd221a81c3d6e22b9e670ddf99004d71de4f769b0312b68c7c4872e2f1

The address above is an example of a valid address. It is 64 characters long (32 bytes) and prefixed with 0x.

Sui also has reserved addresses that are used to identify standard packages and objects. Reserved addresses are typically simple values that are easy to remember and type. For example, the address of the Standard Library is 0x1. Addresses shorter than 32 bytes are padded with zeros to the left.

0x1 = 0x0000000000000000000000000000000000000000000000000000000000000001

Here are some examples of reserved addresses:

  • 0x1 - address of the Move Standard Library (alias std)
  • 0x2 - address of the Sui Framework (alias sui)
  • 0x6 - address of the system Clock object

You can find all reserved addresses in Appendix B: Reserved Addresses.

Further Reading