CIDR Calculator

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Enter any valid IPv4 address in dotted-decimal notation (e.g. 192.168.1.0). You can enter a host address and the calculator will derive the network address.
The CIDR prefix length, also written as /24, /16, etc. It defines how many leading bits are reserved for the network portion of the address.
CIDR NotationSmall subnet
192.168.1.0/24

Network address in slash notation (e.g. 192.168.1.0/24)

Network Address192.168.1.0
Broadcast Address192.168.1.255
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
Usable Hosts254
Total Addresses256
IP ClassC
Usable Hosts254
Network + Broadcast2

192.168.1.0/24 - 254 usable hosts

  • The subnet 192.168.1.0/24 spans 256 total addresses, of which 254 are assignable to devices.
  • A /24 is a typical enterprise LAN segment. The classic Class C /24 gives 254 usable addresses.
  • Network: 192.168.1.0 - Broadcast: 192.168.1.255 - Mask: 255.255.255.0. The wildcard mask is the bitwise inverse of the subnet mask, used in ACLs and OSPF.
  • The entered IP falls in Class C, the classful legacy range. Modern routing is classless (CIDR), so the class is informational only.

Next stepTo split this subnet further, increase the prefix length by 1 to halve the address space. To summarise multiple subnets into one route, decrease the prefix length.

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