Subnetting Concepts Calculator

Subnetting Calculator

1st Octet2nd Octet3rd Octet4th Octet
IP Address
. . .
172 16 1 1
Subnet Mask
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.