Once assigned an I3C Dynamic Address, an I3C Slave normally retains it until the Slave is de-powered. However, an I3C Slave will lose its I3C Dynamic Address through the RSTDAA Broadcast CCC, which resets all I3C Slaves back to their initial I2C state. The RSTDAA Broadcast CCC is not normally used; it would only be used to assign a new Dynamic Address.
An I3C Slave might also lose its Dynamic Address if the Device is reset: for example, pin-reset, full Slave Reset (starting with I3C v1.1), deepest-sleep (power down), etc. In the case of an I3C Device losing its Dynamic Address in non-standard ways, the Hot-Join mechanism is provided to allow the Slave to notify the Master of the event and receive a new Dynamic Address. In cases where the Master has deliberately caused the Slave to lose its Dynamic Address (e.g., by sending the RSTDAA CCC, or by causing a Slave reset), the I3C Master will start a new Dynamic Address Assignment process using the ENTDAA, SETDASA, or SETAASA CCC.
See also Offline Mode for I3C Slaves, where the Devices retain their Dynamic Addresses through a power‑down or deepest‑sleep cycle.