IP Subnet Calculator

Subnet mask, network/broadcast address and host range for plant network planning.

READY

ip_subnet_calculator.tool

READY

IP address

Prefix (/24)

Address typeClass CPrivate (RFC1918)

Network address192.168.10.0/24

Broadcast address192.168.10.255

First host192.168.10.1

Last host192.168.10.254

Usable hosts254

Subnet mask255.255.255.0

Wildcard mask0.0.0.255

Total addresses256

Address rangeSelected subnet

192.168.10.0/24Whole network

192.168.10.0192.168.10.255

Selected subnet: 192.168.10.0 – 192.168.10.255

Bit splitNetwork bits (24)Host bits (8)

11000000

10101000

00001010

00110010

Subnet division

// HOW IT WORKS

From an IP address and a CIDR prefix the tool derives the network address, broadcast address, usable host range and host count. It applies the subnet mask to the IP bitwise.

Formula

network = IP AND mask
broadcast = network OR (NOT mask)
usable hosts = 2^(32 − prefix) − 2

Example

192.168.1.50/24 → network 192.168.1.0, broadcast 192.168.1.255, hosts 192.168.1.1–254 (254 usable).

Notes

The −2 reserves the network and broadcast addresses, which cannot be assigned to hosts.
/31 (point-to-point, RFC 3021) and /32 (single host) are special cases with no host subtraction.