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IP Address & Subnet Calculator

Quickly calculate subnet masks, network ranges, and broadcast addresses. Identify your local public IP details.

Subnet Mask
255.255.255.0
Network ID
192.168.1.0
Broadcast ID
192.168.1.255
Usable Host Range
192.168.1.1 - 192.168.1.254
Total Usable Hosts
254
Note: Calculations are based on standard IPv4 bitwise masking. Supports all CIDR prefixes from /0 to /32.

Professional IPv4 Subnet Calculator

Our networking utility provides precise calculations for IPv4 subnets. Instantly identify network boundaries, broadcast addresses, and usable host ranges for any CIDR notation. Ideal for network engineers and cloud architects designing VPCs or local networks.

Frequently Asked Questions

What is CIDR?

Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and IP routing. It is represented by a slash (/) followed by a number indicating the number of bits used for the network mask.

Why is host count minus 2?

In a standard subnet, the first address is reserved for the Network ID and the last address is reserved for the Broadcast ID. The remaining addresses are available for hosts.

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