CIDR Calculator

Netmask

255.240.0.0

Broadcast Address

172.31.255.255

First Usable IP

172.16.0.1

Last Usable IP

172.31.255.254

Available IPs

1,048,574

Network Type

Class B

Interactive Binary Calculator

IP Address (Binary)

10101100

00010000

00000000

Netmask (Binary)

11111111

11110000

00000000

Classless Inter-Domain Routing (or CIDR), is a method for allocating IP addresses for IP routing first introduced in 1993 to replace the previous classful network addressing architecture on the Internet.