You can display the information about the management interface on the device. If an IP address has not been assigned to the network interface, you must connect to the CLI using a console session on the serial port. Otherwise, connect to the device through Telnet or SSH.
device# show interface management 0 interface management 0 line-speed actual "1000baseT, Duplex: Full" line-speed configured Auto oper-status up ip address "static 10.20.161.66/20" ipv6 ipv6-address [ "static 2620:100:0:f814:10:20:161:66/64 preferred" ]