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IPv4 Subnet Calculator

Enter a CIDR to see network / broadcast / usable range / subnet mask / wildcard / total + usable hosts / IP class / private/loopback flags. Split parent networks into equal subnets or VLSM-pack variable host demands. Convert IP ranges to minimal CIDR blocks.

Calculate a single CIDR

Paste a CIDR like 192.168.1.0/24, or enter the IP and mask separately. Every field is one click to copy.

CIDR notationTip: omit the prefix to default to /32 (single host).

Address scope

Private (RFC 1918)

192.168.1.0/24

256 total addresses

Historical; modern routing is classless.

CIDR

192.168.1.0/24

Network address

192.168.1.0

Broadcast address

192.168.1.255

First usable host

192.168.1.1

Last usable host

192.168.1.254

Usable hosts

254

Total addresses

256

Subnet mask

255.255.255.0

Wildcard mask

0.0.0.255

Class

Binary breakdown

Network bits are on the left, host bits on the right.

11000000.10101000.00000001.00000000

Network (24 bits)Host (8 bits)

Address space

Network, host range, and broadcast positioned across the block.

192.168.1.0

192.168.1.255

192.168.1.0192.168.1.255

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