Subnetting Concepts Calculator

1st Octet2nd Octet3rd Octet4th Octet
IP Address
. . .
172 16 1 1
Subnet Mask
172 16 1 1
Binary Equivalent
IP Address 10101100 00010000 00000001 00000001
Subnet Mask 10101100 00010000 00000001 00000001
Network Portion 10101100 10000 1
Host Portion
000001
00000001
Network Bits
Host Bits
Network Address
Network Portion 10101100 10000 1
Host Portion
000000
00000000
Network Address 10101100 10000 1000000 00000000
Tip: To work out the network address, fill the host portion with binary zeros.
First host address
Network Portion 10101100 10000 1
Host Portion
000000
00000001
First host Address 10101100 10000 1000000 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 10000 1
Host Portion
111111
11111110
Last host Address
172.16.63.254
10101100 10000 1111111 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 10000 1
Host Portion
111111
11111111
Broadcast Address 10101100 10000 1111111 11111111
Tip: To work out the broadcast address, fill the host portion with binary ones.