CIDR calculator
Enter an IPv4 address with CIDR prefix (e.g. 192.168.1.0/24) or dotted subnet mask.
Network
Examples
IP address192.168.1.0
CIDR prefix/24
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Network address192.168.1.0
Broadcast address192.168.1.255
First host192.168.1.1
Last host192.168.1.254
Total addresses256
Usable hosts254
Address classPrivate (RFC 1918)
Network (binary)11000000.10101000.00000001.00000000
For /31 and /32, all addresses in the block may be usable (point-to-point links).

IP address	192.168.1.0
CIDR prefix	/24
Subnet mask	255.255.255.0
Wildcard mask	0.0.0.255
Network address	192.168.1.0
Broadcast address	192.168.1.255
First host	192.168.1.1
Last host	192.168.1.254
Total addresses	256
Usable hosts	254
Address class	Private (RFC 1918)
Network (binary)	11000000.10101000.00000001.00000000

CIDR calculator

Calculate subnet mask, network range, and host count from an IPv4 CIDR.

Tags: cidr, ip, network, subnet

FAQ

What is this tool for?: Infrastructure helpers for networks, hashes, identifiers, and time — common tasks for DevOps and backend developers.
Are results accurate for production?: Use as a quick check. Always validate critical network or security values in your environment.

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