VLSM Calculator

1.0

Base network

Available in block256 addr · 254 usable
2.0

Host requirements

4 segments
/26 · 62
/27 · 30
/28 · 14
/31 · 2
3.0

Address space

Block
256 addr
Allocated
114 addr
Unused
142 addr
Spare in subnets
6 addr
Utilisation
44.5%
192.168.1.0192.168.1.255
Allocated subnet
Unused space
4.0

Allocation schedule

01Sales192.168.1.0/26
Subnet mask
255.255.255.192
First host
192.168.1.1
Last host
192.168.1.62
Broadcast
192.168.1.63
Wildcard
0.0.0.63
Usable / asked
62 / 60
Spare
2
Block size
64 addr
02Engineering192.168.1.64/27
Subnet mask
255.255.255.224
First host
192.168.1.65
Last host
192.168.1.94
Broadcast
192.168.1.95
Wildcard
0.0.0.31
Usable / asked
30 / 28
Spare
2
Block size
32 addr
03Warehouse192.168.1.96/28
Subnet mask
255.255.255.240
First host
192.168.1.97
Last host
192.168.1.110
Broadcast
192.168.1.111
Wildcard
0.0.0.15
Usable / asked
14 / 12
Spare
2
Block size
16 addr
04WAN link R1-R2192.168.1.112/31
Subnet mask
255.255.255.254
First host
192.168.1.112
Last host
192.168.1.113
Broadcast
—
Wildcard
0.0.0.1
Usable / asked
2 / 2
Spare
0
Block size
2 addr
5.0

Router configuration

! VLSM allocation for 192.168.1.0/24
! Generated by VLSM Calculator — vlsmcalculator.cc
!
interface GigabitEthernet0/0
 description Sales
 ip address 192.168.1.1 255.255.255.192
 no shutdown
!
interface GigabitEthernet0/1
 description Engineering
 ip address 192.168.1.65 255.255.255.224
 no shutdown
!
interface GigabitEthernet0/2
 description Warehouse
 ip address 192.168.1.97 255.255.255.240
 no shutdown
!
interface GigabitEthernet0/3
 description WAN link R1-R2
 ip address 192.168.1.112 255.255.255.254
 no shutdown
!