en
conf t
hostname r1
no service call-home
no call-home
no ip http server
no ip http authentication local
no ip http secure-server
line con 0
logg syn
exec-timeout 0 0
width 512
history size 256
exit
interface GigabitEthernet1
 no ip address
!
interface GigabitEthernet1.10
 encapsulation dot1Q 10
!
interface GigabitEthernet1.20
 encapsulation dot1Q 20
!
interface GigabitEthernet1.30
 encapsulation dot1Q 30
!
interface GigabitEthernet1.40
 encapsulation dot1Q 40
!
interface GigabitEthernet1.50
 encapsulation dot1Q 50

Note: Any valid IP can be added to each sub-interface.

r1#show ip interface brief 
Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet1       unassigned      YES unset  up                    up      
GigabitEthernet1.10    unassigned      YES unset  up                    up      
GigabitEthernet1.20    unassigned      YES unset  up                    up      
GigabitEthernet1.30    unassigned      YES unset  up                    up      
GigabitEthernet1.40    unassigned      YES unset  up                    up      
GigabitEthernet1.50    unassigned      YES unset  up                    up