show ip address-conflict

This command displays the status information corresponding to the last detected address conflict.

Format show ip address-conflict
Modes Privileged EXEC
Address Conflict Detection Status Identifies whether the switch has detected an address conflict on any IP address.
Last Conflicting IP Address The IP address that was last detected as conflicting on any interface.
Last Conflicting MAC Address The MAC address of the conflicting host that was last detected on any interface.
Time Since Conflict Detected The time in days, hours, minutes, and seconds since the last address conflict was detected.