Reserved Network Ranges


127.0.0.0/8
Loopback the entire class A beginning with 127.

Private IP address space is defined in RFC1918:

10.0.0.0/8
Private the entire class A beginning with 10.
172.16.0.0/12
Private 16 contiguos Class B, from 172.16.0.0/16 through 172.31.0.0/16
192.168.0.0/16
Private 256 contiguos Class C, from 192.168.0.0/24 through 192.168.255.0/24

The IP Netmask Calculator


IP Address:
Netmask:

IP address (classic):
IP address (cisco):
IP value (binary):
Netmask (binary):
Network:
Total available IP:
Network address:
Broadcast address: