CIDR calculator

Networking

Paste any IPv4 or IPv6 CIDR block to compute the network address, host range, mask, total addresses, and reverse-DNS zone. All computation runs in your browser.

CIDR block

IPv4 — /16

Network address

10.0.0.0

Broadcast address

10.0.255.255

First usable host

10.0.0.1

Last usable host

10.0.255.254

Subnet mask

255.255.0.0

Wildcard mask

0.0.255.255

Total addresses

65,536

Usable hosts

65,534

Address class

Class A (1.0.0.0 – 126.0.0.0)

Network (binary)

00001010.00000000.00000000.00000000

Mask (binary)

11111111.11111111.00000000.00000000

Reverse-DNS zone

0.10.in-addr.arpa

All computation runs in your browser. The input never leaves the page.