IP Subnet Calculator

Calculate subnet details from IP/CIDR notation — network, broadcast, usable hosts, binary, VLSM, and more.

Free & unlimited

IP address / CIDR

CIDR prefix

/24

/0/8/16/24/32

Presets

Private IPClass C/24254 hosts

Subnet details

Network address

192.168.1.0

Broadcast address

192.168.1.255

Subnet mask

255.255.255.0

Wildcard mask

0.0.0.255

First usable host

192.168.1.1

Last usable host

192.168.1.254

Total usable hosts

254

Total addresses

256

CIDR notation

/24

IP class

Network type

Private (RFC 1918)

Address space

Network (192.168.1.0)254 usableBroadcast (192.168.1.255)

Binary representation

IP address

11000000101010000000000100000000

Subnet mask

11111111111111111111111100000000

Network bits (24)Host bits (8)

Subnet division map

How /24 can be divided into smaller subnets:

/25 — 2 subnets, 126 hosts each

#	Network	Range	Broadcast
1	192.168.1.0/25	192.168.1.1 - 192.168.1.126	192.168.1.127
2	192.168.1.128/25	192.168.1.129 - 192.168.1.254	192.168.1.255

/26 — 4 subnets, 62 hosts each

#	Network	Range	Broadcast
1	192.168.1.0/26	192.168.1.1 - 192.168.1.62	192.168.1.63
2	192.168.1.64/26	192.168.1.65 - 192.168.1.126	192.168.1.127
3	192.168.1.128/26	192.168.1.129 - 192.168.1.190	192.168.1.191
4	192.168.1.192/26	192.168.1.193 - 192.168.1.254	192.168.1.255

/27 — 8 subnets, 30 hosts each

#	Network	Range	Broadcast
1	192.168.1.0/27	192.168.1.1 - 192.168.1.30	192.168.1.31
2	192.168.1.32/27	192.168.1.33 - 192.168.1.62	192.168.1.63
3	192.168.1.64/27	192.168.1.65 - 192.168.1.94	192.168.1.95
4	192.168.1.96/27	192.168.1.97 - 192.168.1.126	192.168.1.127

/28 — 16 subnets, 14 hosts each

#	Network	Range	Broadcast
1	192.168.1.0/28	192.168.1.1 - 192.168.1.14	192.168.1.15
2	192.168.1.16/28	192.168.1.17 - 192.168.1.30	192.168.1.31
3	192.168.1.32/28	192.168.1.33 - 192.168.1.46	192.168.1.47
4	192.168.1.48/28	192.168.1.49 - 192.168.1.62	192.168.1.63

CIDR quick reference

This is a private IP range (RFC 1918). Not routable on the public internet; commonly used for internal networks.

All processing happens in your browser. No data is sent to any server.

About this tool

1
Enter IP/CIDR
Input an IP address with CIDR notation (e.g., 192.168.1.0/24).
2
View details
See network address, broadcast, subnet mask, and usable host range.
3
Calculate subnets
Split the network into smaller subnets.

/24 gives 254 usable hosts, /25 gives 126, /26 gives 62.
The first address is the network address, the last is broadcast - both are not usable.
Private IP ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.