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Subnetting Concepts Calculator
Subnetting Calculator
1st Octet
2nd Octet
3rd Octet
4th Octet
IP Address
.
.
.
172
16
1
1
Subnet Mask
255.255.192.0
255.0.0.0
255.128.0.0
255.192.0.0
255.224.0.0
255.240.0.0
255.248.0.0
255.252.0.0
255.254.0.0
255.255.0.0
255.255.128.0
255.255.192.0
255.255.224.0
255.255.240.0
255.255.248.0
255.255.252.0
255.255.254.0
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252
255
255
192
0
Binary Equivalent
IP Address
10101100
00010000
00000001
00000001
Subnet Mask
11111111
11111111
11000000
00000000
Network Portion
10101100
00010000
00
Host Portion
000001
00000001
Network Bits
Host Bits
Network Address
Network Portion
10101100
00010000
00
Host Portion
000000
00000000
Network Address
10101100
00010000
00000000
00000000
Tip:
To work out the network address, fill the host portion with binary zeros.
First host address
Network Portion
10101100
00010000
00
Host Portion
000000
00000001
First host Address
10101100
00010000
00000000
00000001
Tip:
To work out the first host address, fill the host portion with binary zeros except for the last bit which is set to a binary one.
Last host address
Network Portion
10101100
00010000
00
Host Portion
111111
11111110
Last host Address
172.16.63.254
10101100
00010000
00111111
11111110
Tip:
To work out the last host address, fill the host portion with binary ones except for the last bit which is set to a binary zero
Broadcast Address
Network Portion
10101100
00010000
00
Host Portion
111111
11111111
Broadcast Address
10101100
00010000
00111111
11111111
Tip:
To work out the broadcast address, fill the host portion with binary ones.
