IPv4 Subnet & CIDR Calculator

Calculate usable host range, broadcast address, subnet mask, and wildcard for network admins.

Input Parameters

IPv4 Host IP Address

CIDR Subnet Prefix Length/24

/8 (16.7M)/16 (65.5k)/24 (254)/30 (2)

Common Subnet Presets:

Usable Host IP Range

192.168.1.1 – 192.168.1.254

254 usable hosts (256 total addresses)

Class C

Network ID (Subnet)192.168.1.0

Directed Broadcast IP192.168.1.255

Subnet Mask255.255.255.0

Inverse Wildcard Mask0.0.0.255

IP binary:11000000.10101000.00000001.00110010

Mask binary:11111111.11111111.11111111.00000000

175 available

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IPv4 subnet calculator: network and broadcast addresses, usable host range, subnet and wildcard masks for any CIDR prefix.

How many hosts are in a /24?

254 usable (256 addresses minus network and broadcast).

What is a wildcard mask?

The inverse of the subnet mask, used in ACLs and OSPF network statements.

What is CIDR notation?

The /N suffix counts the network bits, e.g. /24 means mask 255.255.255.0.